Mon Nov 23 16:03:13 EST 1992 From owner-mpi-ptop@CS.UTK.EDU Wed Nov 25 13:39:28 1992 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA21716; Wed, 25 Nov 92 13:39:28 -0500 Received: by CS.UTK.EDU (5.61++/2.8s-UTK) id AA09797; Wed, 25 Nov 92 13:14:37 -0500 Received: from relay2.UU.NET by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA09791; Wed, 25 Nov 92 13:14:32 -0500 Received: from uunet.uu.net (via LOCALHOST.UU.NET) by relay2.UU.NET with SMTP (5.61/UUNET-internet-primary) id AA22187; Wed, 25 Nov 92 13:14:33 -0500 Received: from kailand.UUCP by uunet.uu.net with UUCP/RMAIL (queueing-rmail) id 131337.3987; Wed, 25 Nov 1992 13:13:37 EST Received: from brisk.kai.com (brisk) by kailand.kai.com via SMTP (5.65d-92031301) id AA12688; Wed, 25 Nov 1992 12:06:04 -0600 Received: by brisk.kai.com (920330.SGI-92101201) id AA08958; Wed, 25 Nov 92 12:06:02 -0600 Date: Wed, 25 Nov 92 12:06:02 -0600 Message-Id: <9211251806.AA08958@brisk.kai.com> To: mpi-pt2pt@cs.utk.edu, mpi-collcomm@cs.utk.edu, mpi-formal@cs.utk.edu, mpi-ptop@cs.utk.edu Reply-To: William.Gropp's.message.of.Wed@kai.com, 25 Nov 92 09:28:43 CST <9211251528.AA12985@godzilla.mcs.anl.gov> Subject: Nonblocking functions and handlers. From: Steven Ericsson Zenith Sender: zenith@kai.com Organization: Kuck and Associates, Inc. 1906 Fox Drive, Champaign IL USA 61820-7334, voice 217-356-2288, fax 217-356-5199 Bill Gropp writes: (Warning: radical position that I'm not sure even I hold follows:) An interesting issue is whether we should defer all nonblocking communications to a thread-based execution model. I'm not so sure this is a radical position Bill since even nonsynchronized communication will need to be defined formally this way. Nonsynchronized communication is in effect creating a parallel process that has the job of passing the communication on. Al Geist earlier asked the question wheather buffers used by nonsynchronized communication should be accessible after the communication has started - the answer should be - no, unless by some explicit mechanism that formally amounts to a communication with the process mentioned above. Any nonexplicit interaction (e.g. a write to the buffer) would have to be specified as formally equivalent to an explicit interaction. Also, there is quite a range of terminology in use. One common error: "Asynchronous" and "synchronous" has quite a particular meaning in EE and when CS people use the terms in relation to message passing they usually mean NONSYNCHRONIZED and SYNCHRONIZED. Also BLOCKING = SYNCHRONIZED. Let us begin a glossary that defines the terms we use - if no-one else volunteers I'll take this to be the responsibility of the Formal Specification Subcommittee. So I'm looking for volunteers from that subcommittee. Steven From owner-mpi-ptop@CS.UTK.EDU Wed Dec 2 15:08:45 1992 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA12207; Wed, 2 Dec 92 15:08:45 -0500 Received: by CS.UTK.EDU (5.61++/2.8s-UTK) id AA24266; Wed, 2 Dec 92 14:56:52 -0500 Received: from super.super.org by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA24261; Wed, 2 Dec 92 14:56:46 -0500 Received: from b125 (b125.super.org) by super.super.org (4.1/SMI-4.1) id AA00585; Wed, 2 Dec 92 14:56:38 EST Received: by b125 (4.1/SMI-4.1) id AA02506; Wed, 2 Dec 92 14:56:37 EST Date: Wed, 2 Dec 92 14:56:37 EST From: lederman@b125.super.org (Steve Lederman) Message-Id: <9212021956.AA02506@b125> To: mpi-ptop@cs.utk.edu Subject: hello Most of the other subcommittees are having discussions and (hopefully :-) making progress. As a member of this group, I was wondering if there has been some discussion I missed? If not, I feel we have a number of potential issues to discuss before the next meeting in Dallas. Given the holidays coming up, I don't think that leaves much time. Does anyone have any topics or suggestion on how we should proceed? Steve Huss-Lederman From owner-mpi-ptop@CS.UTK.EDU Thu Dec 3 02:38:33 1992 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA25221; Thu, 3 Dec 92 02:38:33 -0500 Received: by CS.UTK.EDU (5.61++/2.8s-UTK) id AA05999; Thu, 3 Dec 92 02:10:42 -0500 Received: from gmdzi.gmd.de by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA05995; Thu, 3 Dec 92 02:10:39 -0500 Received: from f1neuman.gmd.de (f1neuman) by gmdzi.gmd.de with SMTP id AA06896 (5.65c/IDA-1.4.4 for ); Thu, 3 Dec 1992 08:10:10 +0100 Received: by f1neuman.gmd.de id AA14748; Thu, 3 Dec 1992 08:09:55 +0100 Date: Thu, 3 Dec 1992 08:09:55 +0100 From: Rolf.Hempel@gmd.de Message-Id: <9212030709.AA14748@f1neuman.gmd.de> To: mpi-ptop@cs.utk.edu Subject: Getting started I agree with Steve Huss-Lederman that we have to get started immediately in order to get something done before our next meeting. I'm sorry that as the chairman of this group I didn't take the initiative earlier, but after my return from SUPERCOMPUTING 92 there were a lot of things to be done first. How should we get things going most effectively? At the moment I don't have any input from others. So, the only document I have is my own proposal which I distributed at the Minneapolis meeting. In that paper I tried to integrate the concept of virtual topologies (Tori and more general graphs) into the current MPI1 proposal. I suggest that we take this paper as a starting point of our discussions. >From the (hopefully starting) e-mail avalanche we can then distill the open questions and controversial points for discussion at the January meeting. I assume that there are some people in our group who were not present at the Minneapolis meeting, so they do not have the paper I mentioned. Therefore, with another mail I send you the text again as a PostScript file. I processed it first using "compress" and then "uuencode". Before printing, you thus have to do the reverse operations. If you have any problems, please let me know. Rolf Hempel From owner-mpi-ptop@CS.UTK.EDU Thu Dec 3 02:39:47 1992 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA25246; Thu, 3 Dec 92 02:39:47 -0500 Received: by CS.UTK.EDU (5.61++/2.8s-UTK) id AA06040; Thu, 3 Dec 92 02:14:55 -0500 Received: from gmdzi.gmd.de by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA06036; Thu, 3 Dec 92 02:14:41 -0500 Received: from f1neuman.gmd.de (f1neuman) by gmdzi.gmd.de with SMTP id AA06999 (5.65c/IDA-1.4.4 for ); Thu, 3 Dec 1992 08:14:11 +0100 Received: by f1neuman.gmd.de id AA15778; Thu, 3 Dec 1992 08:13:54 +0100 Date: Thu, 3 Dec 1992 08:13:54 +0100 From: Rolf.Hempel@gmd.de Message-Id: <9212030713.AA15778@f1neuman.gmd.de> To: mpi-ptop@cs.utk.edu Subject: proposal Cc: gmap10@f1neuman.gmd.de begin 664 virt.ps.Z M'YV0)4)`F=(B")DW8LJTD.$"AH(2)8;(*1.&SALY.D"0L9,&SAP6(.R4D3,G MS1LW(&JXF)&C!@@40U*`B)$#AXT6.6"`D!*&3)HQ8=B`*)*G#(@I;\S0N1-F MXL,25-+085,F(QDY:43*<;$QS5,H8/&IYLS:O%DU*G3 M1@P9('#0D/&T2-LA;]JT*>.&SIRT9$&E M#!8B/^F`D`%#I\\QHLF4,0.B\^?0(!(J1OG""8@7JEFS>=-3X^K;0O:(64S& MMYD^ME],N6UY#!H%NWOGOHUESW(G?83!PYI1')A84 MF_39-\.9"O#91GAU!&5&&660L<<<=%14QQRGB?;"H6XDRL:BC8(`IE%P:(@F M$`W"D<983(Y0ZJGL88&F$4U4M(4"""IH8*T+)F>$$$(,:"M=721'AAE,SL%: M@(``:T51:F1&"Y&FP0::PP;HX6W&*H#%;)$09\('S;%'AY;":$5+%Z%#)P=5A+QA!H-+4' MS$T)T3(;JLF!W&U^->B6NDD4$2UAQ9%1!QQ,FO'&&RY*IG1A??`U\#Q!APK=GBT<8NM%G#3=#P-H1";.==" M&H>*M8?>9%04AD9OTT&P42]HO-@9AA?,XM_?@2!6V)&+/1,(/:$7X7%XOZ#W M'6F000<:?Z/10N"1$LXV56^-GI*+=8@AN61HZHU&&6F<@08=I9\NN.H@L,XX M&B"<-4?L"DQ>N^EX)$7L77H"_KO1JQ,VO,&PRSYY]LNWD(?SO:,^./706>\Z M7L=K+]E,,MS`_92`XQ'^]&\+[WJ!Z<]^]VV6X[<9S7*PFB&,9_1T%."C+$GNVMYS)Y\2TL98A0W\IP MJ#FL`003@=1%TC@E(C!I#&-8F0,;ASC%M>YP/^I/%S;7M@>";'MXM%KDP%;( M%YR,#BG;X/J68[GEE*M`CW.@`^U'O!@H('\.G&!;*MC!]95K6V`C)"-+.#;+ M%0B(4KI-$OZ6QU>.$01$R,YFQ+"V/4QJ)/EZ`2_A0,.EO7$-;GC#'=P@G+45 M\PUK(*1RDN`B`XI)/[E;C+G:\`:16`1-9>BE%ZG2E*-0,XX6F8B+T*!,.*`1 M!+^40S##24QV0A,$R%0F,^GYS&A*:%20:@KO%!#/8`94#G3H)SZ3N5O2!HHZF!#3`G!Y)%BT`I MK<$>4+H<_"V,8P[4R:`HV"Q&9@TEJ52:S@IU&Q+.@9UW"!YOT',;*2BLBN8R M$["2(P0BO$$T>O*CNN3#)#D(J0Q5NZA7J=*L;UE!`6BRPA[.,`=KMJ8[+0AC M7`O$'3A^M5EC!:N+8&2?R[D'0$9Q:D7V4-6KJA&-;5Q#\M`Y1S2%80_<].8; ML%4&-J3NA"^8UQX0UTQW0.N4XD#> M`K'W!4MBVWK1%""VF1=-O&/;6>Y[!^7"<;3?G)+\=+(4+PAF@,9!S;%-H\%C224<0$*TO;6G,8R)#!P6X M!C2HX==LW.31&?38HT`XJ*6,,+A!U0`OP^(!#'Q,YS:1B-9AC@^=+W M@?0,SJR`&YP9RE&&`1'4S&8WPSD)=B9TGAD-:2?'8`BN=O2K2P-I1$>:TFR6 M,I,?'6D8.%K/6RY-$?:L9V(7P=%#Z+.F)6T$8AN!U$8PM0Q\0$VA14QVD&;? 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M^]X,A4PG[TD`+QGQF\GF4U.2_=EQ)PHR!%`J)1-+%_>?_V"JP"P5IKGUG(AN MD_^`1N977B$P3(@3W"V[+._&O]0,'T$8#,GV;-(J#^6(VTC-6;;[U\2MYS_U&*J M>S$AG@374-N7R)"?U9L4"%Q#"-`/'J'/\=@;E>6]FB5OK\HP0*O9X(>4P!?+ MFM>#%$$'*J[9AJ=K+B;:!5P"L.97Y:]9@M<;I5,@FX?-SH)B,Q[/EY=LMN$M MFY?"5%55HAI.==?;6!<4W&WK;OL#DI/!,^\5"*2O&[ZCT',W.Y*2PXE3*(8U5Z`CP%XH1Y$KS)[3.VA-.Z"N2G,0-9MFQ8GC.[ M;(.7!]9[;]&O-LL'@#H_!O@`REOU9Y'Y49MQJ`)2EGO)!\5(\$I8^"IQIBY' MBK^$[-DI7M-W$;L\+&W"!W2-I3W=K(M92EOK7![F_GR5ZUF@IPDOSQR5X>E" M_;`$'=!V)C0OLQL@Q.[)!2?+NT*E\Z(4E>GOT[CF^*#*S,.@H\Q1>0C!Q3E* M<-^!2\I(7YZY(%>H;.\-%NV0^,ZLYJ.9UK@;\!BD(=.Z#T/5'O`OLUR4%#V# M(^F7(DLY:I;``/J&H>;R5M_%\6.S+X56BLM%?N7XB?/%65R=F=?17[S76P[_ MCY$$O$4!,N+TU6R1H`ZG<P\K M"-^X\^'%+L7&_N?5L^\QD5VC3N3\\.LU:UQOE8JZ&+K&4`'P@/A3#H`X;`L0 8%.J.\X2V@$(AG]!0(!I$%"0$?8$G0*D" ` end From owner-mpi-ptop@CS.UTK.EDU Mon Dec 7 15:09:32 1992 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA05769; Mon, 7 Dec 92 15:09:32 -0500 Received: by CS.UTK.EDU (5.61++/2.8s-UTK) id AA21151; Mon, 7 Dec 92 14:43:08 -0500 Received: from super.super.org by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA21147; Mon, 7 Dec 92 14:43:05 -0500 Received: from b125 (b125.super.org) by super.super.org (4.1/SMI-4.1) id AA12334; Mon, 7 Dec 92 14:43:03 EST Received: by b125 (4.1/SMI-4.1) id AA03830; Mon, 7 Dec 92 14:43:02 EST Date: Mon, 7 Dec 92 14:43:02 EST From: lederman@b125.super.org (Steve Lederman) Message-Id: <9212071943.AA03830@b125> To: mpi-ptop@cs.utk.edu Subject: thoghts on Rolf proposal I am sorry to have started up this discussion and then not followed up quickly but I have been fighting a cold since late last week. (I think I may actually be winning :-) I have read Rolf's Virtual Topologies proposal and think it is a good place to start our discussions. Before I go into the details, I thought I would bring up a few "global" issues that came to my mind during my reading: 1) I think this subgroup is likely to get some resistance to inclusion of topologies into MPI1. I think there are some good points made for their inclusion but anything to strengthen that position would be good. 2) The document has two classes of topologies: general graphs and tori (including meshes and rings). My first question is how useful are the general graphs in practicality. I must show my ignorance on this and say I have never used such a capability. It appears that it could be very useful but it would also appear that it could significantly increase the complexity of implementing the package. Can anyone give some information here? The second question regards what topologies should be given special treatment. Tori are clearly important. What about hypercubes (Intel i860, NCUBE), trees (CM5) and even less common ones like a ring of rings on the KSR. I don't think (though I don't have the proof) that all these structures can, in general, be embedded contention free in a torus. And even if they could, if they are common enough, they would be a nice convenience. The general question is what special topologies should this standard support and what is the basis for the decision. More is nice but also more complex. 3) An argument is made for including topologies at the start since the onion-skin model does not hold because of the calls needed. I think this group should define what information and calls are needed in MPI1 to support the type of topology system being proposed. I think this will help define the complexity of the system. Also, even if the full topology system is not adopted for MPI1, I think a good case can be made for including the necessary calls as is being done for collective communications. 4) A small point: I have found all the references except the two to PARMACS. Are these available electronically? These are just some starting thoughts. What do you all think? Steve From owner-mpi-ptop@CS.UTK.EDU Tue Dec 8 15:42:15 1992 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA27195; Tue, 8 Dec 92 15:42:15 -0500 Received: by CS.UTK.EDU (5.61++/2.8s-UTK) id AA23925; Tue, 8 Dec 92 15:38:55 -0500 Received: from sampson.ccsf.caltech.edu by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA23921; Tue, 8 Dec 92 15:38:53 -0500 Received: from elephant by sampson.ccsf.caltech.edu with SMTP id AA27482 (5.65c/IDA-1.4.4 for mpi-ptop@cs.utk.edu); Tue, 8 Dec 1992 12:38:41 -0800 Received: from lion.parasoft by elephant (4.1/SMI-4.1) id AA16279; Tue, 8 Dec 92 12:38:12 PST Received: by lion.parasoft (4.1/SMI-4.1) id AA00574; Tue, 8 Dec 92 12:38:16 PST Date: Tue, 8 Dec 92 12:38:16 PST From: jwf@lion.Parasoft.COM (Jon Flower) Message-Id: <9212082038.AA00574@lion.parasoft> To: mpi-ptop@cs.utk.edu Subject: Thoughts..... Just a few random thoughts inspired by Steve Lederman's mail... I agree that a general version of a "graph" topology might pose too high constraints on an MPI1 implementation. HOWEVER, this appears to be a problem that research groups have spent and are spending quite a lot of time on. Maybe we could get them to volunteer to contribute some code......???? I have also never used a general graph in my code, but quite a few Express users have asked us for n-ary trees. I think this would suit both the CM5 and KSR structures quite reasonably. I believe that a hypercube is a torus with only two nodes in each dimension, so it IS a subset of the tori proposed by Rolf. I would like to see something to deal with the periodicity (or otherwise) of boundary conditions. In particular I think you want to distinguih between a mesh and a periodic two dimensional grid. Many applications need to distinguish these cases. I would suggest that the function that returns a processor number be allowed to return a "magic" processor number that means "there's noone there". If at all possible, however, I would like this to be a different number from the error condition because I like to see us able to pass it to the MPI1 communication primitives and have them know how to deal with it. If this is possible a lot of messy "if(this), else(that)" logic can be left out of user code. Jon Flower From owner-mpi-ptop@CS.UTK.EDU Wed Dec 9 08:39:32 1992 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA10629; Wed, 9 Dec 92 08:39:32 -0500 Received: by CS.UTK.EDU (5.61++/2.8s-UTK) id AA10654; Wed, 9 Dec 92 08:30:57 -0500 Received: from gmdzi.gmd.de by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA10650; Wed, 9 Dec 92 08:30:53 -0500 Received: from f1neuman.gmd.de (f1neuman) by gmdzi.gmd.de with SMTP id AA28376 (5.65c/IDA-1.4.4 for ); Wed, 9 Dec 1992 14:30:25 +0100 Received: by f1neuman.gmd.de id AA15353; Wed, 9 Dec 1992 14:30:01 +0100 Date: Wed, 9 Dec 1992 14:30:01 +0100 From: Rolf.Hempel@gmd.de Message-Id: <9212091330.AA15353@f1neuman.gmd.de> To: mpi-ptop@cs.utk.edu Subject: Thoughts on Thoughts... Cc: gmap10@f1neuman.gmd.de I would like to comment on the notes of Steve Lederman and Jon Flower. 1. There was the question of what the graph mapping is useful for. I have two answers to this: First, in the PARMACS project we had requests from users (mainly in the CFD field) who had very complicated geometrical domains on which they solve their partial differential equations. The parallelization of such (large) codes usually leads to so-called block-structured domains, in which each block is logically rectangular, but the blocks may be connected in any way. This cannot be embedded into grid or torus structures. On the other hand, the communication is mainly local (between neighboring blocks) also in this case, so a good mapping of the process graph on the hardware helps a lot in minimizing the overall communication. We have implemented the graph mapping on a number of architectures. I did it myself for hypercubes, and the result is near-optimal in most cases. I agree with Jon that there is a lot of theoretical material on mapping strategies. But even if at the moment it seems to be too difficult for some weird architecture, it is still an advantage if the user code contains the logical topology information. If a good mapping cannot be constructed, an implementation may opt to use just random mapping instead. After all, that is what would happen if the user did not specify a topology. Second, there are many different topologies that users might come up with, and you cannot have special functions for all of them. The choice I made in my proposal was to treat the case of n-dim tori separately, but to subsume all the rest in the general graph structure. This makes it possible to specify any topology, and it does not impose all the overhead of the graph definition in the special case of simple tori. I would recommend that if anybody finds it useful to have special functions for other topologies, that he then make a proposal how this should look like, and how it could be integrated into MPI. 2. Jon raised the issue of handling periodicity in a grid/torus topology. I think this is a good idea. The MPI_TORUS function should in this case be renamed MPI_GRID, and an additional argument (vector) could be used to specify periodicity. Do other people agree? Any proposal for concrete syntax? Rolf From owner-mpi-ptop@CS.UTK.EDU Wed Dec 9 14:10:01 1992 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA18505; Wed, 9 Dec 92 14:10:01 -0500 Received: by CS.UTK.EDU (5.61++/2.8s-UTK) id AA17251; Wed, 9 Dec 92 13:49:23 -0500 Received: from fslg8.fsl.noaa.gov by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA17247; Wed, 9 Dec 92 13:49:18 -0500 Received: by fslg8.fsl.noaa.gov (5.57/Ultrix3.0-C) id AA27235; Wed, 9 Dec 92 18:49:06 GMT Received: by macaw.fsl.noaa.gov (4.1/SMI-4.1) id AA01554; Wed, 9 Dec 92 11:48:10 MST Date: Wed, 9 Dec 92 11:48:10 MST From: hender@macaw.fsl.noaa.gov (Tom Henderson) Message-Id: <9212091848.AA01554@macaw.fsl.noaa.gov> To: mpi-ptop@cs.utk.edu Subject: ...and yet more thoughts... I would like to comment on Rolf's comments and generally toss in my two cents worth... 1. I agree that grids and tori should be handled differently. As a user, I would like to see some sort of error message (or at least some condition I can detect and print my own message) any time I try to communicate with a non-existent logical process. Any time an MPI routine can inform me that I'm doing something stupid, I'll avoid hours of debugging. 2. It is possible that a user may want periodicity in some dimensions and not in others. An example might be a global weather model. Often the polar regions are excluded to avoid singularity. This type of model is periodic in the east-west direction and non-periodic in the north-south and vertical directions. Maybe it would be best to have a single general-purpose Cartesian mapping routine and specify periodicity in each dimension instead of having two functions (MPI_TORUS and MPI_GRID). Here's a shot at it: NAME MPI_CART Arrange the processes of a process group in a Cartesian grid structure with n dimensions. SYNOPSIS integer function MPI_CART (gid, ndim, dims, boundaries) integer gid integer ndim integer dims(*) integer boundaries(*) INPUT ARGUMENTS gid the ID number of the process group to be structured. ndim the number of dimensions of the grid. dims the number of process per coordinate direction. boundaries the boundary characteristics in each coordinate direction. DESCRIPTION The processes of the group with ID number gid are arranged in a grid structure. By assigning neighboring positions in the logical process grid to neighboring processors in the hardware the system can optimize the locality of inter-process communications. The number of dimensions is specified by ndim. The number of logical processes in each coordinate direction is specified by array dims. Array boundaries specifies the periodicity in each coordinate dimension. If boundaries(i) is set to MPI_PER then dimension i is treated as periodic. If boundaries(i) is set to MPI_NPER then dimension i is treated as non-periodic. If all bounaries(i) are set to MPI_PER, then the topology is a torus. RETURN VALUE If the calling process is assigned a position in the grid, MPI_CART returns the total number of processes in the grid. If the calling process is not in the grid, the return value is set to 0. A value of -1 is returned if an error occurs. I'm not sure that the constants MPI_PER and MPI_NPER (or MPI_CART) have the best names. Any ideas? 3. In Rolf's parallel Poisson solver example (p. 5), array dims(*) is set up explicitly. It would be nice to have an automatic way of distributing processes among dimensions so recompilation would not be required to run on different numbers of processors. An example of this kind of utility is Parasoft's exgridsplit() routine (KXGDSP()). I'd like to propose a similar routine for MPI-- basically exgridsplit() with a bit more flexibility. This routine should be fairly easy to port since there is no machine-dependent stuff inside. Here's a proposal: NAME MPI_MAKDIM Divide the processes of a process group among n dimensions of a Cartesian grid. SYNOPSIS integer function MPI_MAKDIM (gid, ndim, dims) integer gid integer ndim integer dims(*) INPUT ARGUMENTS gid the ID number of the process group to be structured. ndim the number of dimensions of the grid. dims the number of process desired per coordinate direction. OUTPUT ARGUMENTS dims the number of process per coordinate direction. DESCRIPTION The processes of the group with ID number gid are divided as evenly as possible among ndim dimensions, subject to the constraint that all processes in the group are used. The caller may further constrain the operation of this routine by specifying elements of array dims. If dims(i) is set to a positive number, the routine will fix the number of process in coordinate direction i to dims(i). Processes will then be distributed among dimensions where dims(i) is set to 0, subject to the above constraints. Note that an error will occur if dims(i) is positive and does not evenly divide the number of processes in the group. Negative input values of dims(i) will also cause an error. All elements of dims(*) must be set to 0 for completely automatic process distribution. When the function returns, dims(i) will be set to the number of processes in coordinate direction i. For dims(i) not set by the user, dims(i) will be ordered (MAXIMUM, ..., MINIMUM). Array dim(*) is suitable for use as input to routine MPI_CART(). RETURN VALUE If the routine completes without error, the return value is set to 0. A value of -1 is returned if an error occurs. EXAMPLES integer ndim parameter (ndim=3) integer gid, dims(ndim), ret, dummy, boundaries(ndim) C Set process grid size do 10 i=1,ndim dims(i) = 0 10 continue gid = ALL ret = MPI_MAKDIM(gid, ndim, dims) C Should really do error control here... if (ret .ne. 0) stop C Set up Cartesian process grid for weather model example above. C Dimensions 1, 2, and 3 are East-West, North-South, and vertical. boundaries(1) = MPI_PER boundaries(2) = MPI_NPER boundaries(3) = MPI_NPER ret = MPI_CART(gid, ndim, dims, boundaries) C (etc.) Suppose numprocs is the number of processes in group gid. Here are some examples of how MPI_MAKDIM() would behave in the above example: numprocs = 27 dims(1) = 3 dims(2) = 3 dims(3) = 3 numprocs = 33 dims(1) = 11 dims(2) = 3 dims(3) = 1 numprocs = 512 dims(1) = 8 dims(2) = 8 dims(3) = 8 numprocs = 1024 dims(1) = 16 dims(2) = 8 dims(3) = 8 If dims(*) were set as follows before calling MPI_MAKDIM(): dims(1) = 0 dims(2) = 0 C Restrict number of processes in "vertical" dimension to 3 dims(3) = 3 The same values of numprocs would produce: numprocs = 27 dims(1) = 3 dims(2) = 3 dims(3) = 3 numprocs = 33 dims(1) = 11 dims(2) = 1 dims(3) = 3 numprocs = 512 ERROR (512 not evenly divisible by dims(3)) numprocs = 1024 ERROR (512 not evenly divisible by dims(3)) Any comments? Is the extra flexibility of allowing user-specified constraints on dims(*) worth including? Is MPI_MAKDIM worth having at all? Tom Henderson From owner-mpi-ptop@CS.UTK.EDU Wed Dec 9 15:39:49 1992 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA20328; Wed, 9 Dec 92 15:39:49 -0500 Received: by CS.UTK.EDU (5.61++/2.8s-UTK) id AA20006; Wed, 9 Dec 92 15:32:23 -0500 Received: from super.super.org by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA20000; Wed, 9 Dec 92 15:32:19 -0500 Received: from b125 (b125.super.org) by super.super.org (4.1/SMI-4.1) id AA07951; Wed, 9 Dec 92 15:32:17 EST Received: by b125 (4.1/SMI-4.1) id AA04444; Wed, 9 Dec 92 15:32:16 EST Date: Wed, 9 Dec 92 15:32:16 EST From: lederman@b125.super.org (Steve Lederman) Message-Id: <9212092032.AA04444@b125> To: mpi-ptop@cs.utk.edu Subject: additional thoughts A few thoughts: I have thought about the definition of the torus given by Rolf and I now agree that a hypercube can be embedded into it. I was thinking of a torus in the less general and more geometric sense. Given the fact that you can embed regular graphs into hypercubes this seems like a general enough topology. Some of the latest discussion seems centered on whether or not it is "too general." As Rolf points out, a grid is a subset of a torus where you ignore the extra link. If you had all the hypercube connections, then this would not be a major issue. However, on many real systems you cannot embed the general torus or hypercube so that each logical link gets a contention free physical link. In this case the algorithm for placing the logical processes on the physical nodes needs to decide which links will get one hop contention free physical links and which will get physical links that would require multiple hops and potential contention. Thus, being able to specify important topologies that are simplier than the tori would allow (but not require) the mapping algorithm not to worry about the links that will not be used. Given this idea, I think that grids are a useful concept in addition to tori since they are used with some frequency. Do people agree with this concept? Are there other geometries that should be given special recognition? I still have some reservations about general graphs because they may scare some people from the complexity point of view. However, given Rolf's argument that a random mapping can always be used then I think it is good to include this functionality. It allows for any easy way out for those vendors that wish to do that and still allows vendors to write more intelligent mappers if they can. It also allows for future research to come up with better heuristics that could be incorporated. Along this line of thinking, would it be useful to include weights in MPI_GRAPH? They can always be ignored but might be useful for some mapping algorithms and a new algorithm might be able to effectively use them. A value of zero would be given the default weight of one. The negative I see to this is that it takes up storage and adds some complexity to the user. I think it might be worth it if others feel that it is a feature that users would like and might be used in some mapping algorithms. What do you think? I think it is worth while to support periodic boundary conditions. I don't have a strong opinion yet about the MPI_MAKDIM routine. It seems simple and can be provided to all vendors for inclusion so my inclination is to include it if enough users feel it would help. Steve From owner-mpi-ptop@CS.UTK.EDU Mon Dec 21 03:27:57 1992 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA07780; Mon, 21 Dec 92 03:27:57 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA21765; Mon, 21 Dec 92 03:27:35 -0500 X-Resent-To: mpi-ptop@CS.UTK.EDU ; Mon, 21 Dec 1992 08:27:34 GMT Errors-To: owner-mpi-ptop@CS.UTK.EDU Received: from gmdzi.gmd.de by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA21757; Mon, 21 Dec 92 03:27:30 -0500 Received: from f1neuman.gmd.de (f1neuman) by gmdzi.gmd.de with SMTP id AA11139 (5.65c/IDA-1.4.4 for ); Mon, 21 Dec 1992 09:26:53 +0100 Received: by f1neuman.gmd.de id AA11153; Mon, 21 Dec 1992 09:26:23 +0100 Date: Mon, 21 Dec 1992 09:26:23 +0100 From: Rolf.Hempel@gmd.de Message-Id: <9212210826.AA11153@f1neuman.gmd.de> To: mpi-ptop@cs.utk.edu Subject: draft meeting agenda Cc: gmap10@f1neuman.gmd.de Based on the email I saw so far on MPI_PTOP, I gathered the following points for discussion at our subcommittee meeting in Dallas. I tried to order the material in some logical way, but for the agenda of our meeting we can of course rearrange the points as you like. 1. Do we want to add functions for grids as opposed to tori? 2. How to handle periodicity information? Is the specification of periodicity per coordinate direction a good idea? (suggestions for syntax?) Is Tom's proposal for a function MPI_CART okay with everybody? 3. What about including functions for handling general graphs? - is the inclusion of a more general topology than tori or grids a good idea? - is the difficulty of implementation a problem, or does it help to allow a random mapping as a last resort? - is the proposed functionality sufficient? Does anybody feel we should include more user-supplied info (computational weights of nodes, volume of data traffic along edges)? 4. Should we introduce special functions for hypercubes? As Jon pointed out, they could be expressed as tori. Is this sufficient? 5. What about trees? 6. What about more esoteric topologies, like rings of rings? Are there any other structures people would like to see included? 7. What about Tom's function MPI_MAKDIM which automatically distributes the processes along the coordinate directions? 8. Should the pid inquiry functions return some magic number, if there is not such a process (as Jon suggested)? 9. What can we do to convince the general MPI committee that virtual topologies are to be included in the standard? 10. Do we propose to include the PTOP functions into MPI-1? If not, how can they be based on MPI-1? Please check whether all the points you would like to discuss at our meeting are somehow covered by this list. If not, send a note. I will send out an updated list on January 4th. I wish everybody on the committee a Merry Christmas and a Happy New Year! Rolf From owner-mpi-ptop@CS.UTK.EDU Thu Dec 31 22:14:03 1992 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA14662; Thu, 31 Dec 92 22:14:03 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA12437; Thu, 31 Dec 92 22:13:48 -0500 X-Resent-To: mpi-ptop@CS.UTK.EDU ; Fri, 01 Jan 1993 03:13:47 GMT Errors-To: owner-mpi-ptop@CS.UTK.EDU Received: from pnlg.pnl.gov by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA12429; Thu, 31 Dec 92 22:13:45 -0500 Received: from carbon.pnl.gov (130.20.65.121) by pnlg.pnl.gov; Thu, 31 Dec 92 19:09 PST Received: from fermi.pnl.gov by carbon.pnl.gov (4.1/SMI-4.1) id AA21172; Thu, 31 Dec 92 19:08:30 PST Received: by fermi.pnl.gov (4.1/SMI-4.1) id AA11537; Thu, 31 Dec 92 19:08:29 PST Date: Thu, 31 Dec 92 19:08:29 PST From: d3g681@fermi.pnl.gov To: littlefield@fermi.pnl.gov, mpi-collcomm@cs.utk.edu, mpi-ptop@cs.utk.edu Message-Id: <9301010308.AA11537@fermi.pnl.gov> X-Envelope-To: mpi-ptop@cs.utk.edu, mpi-collcomm@cs.utk.edu Posted to mpi-collcomm and mpi-ptop. I have just taken the archived discussion from netlib@ornl and not found anything more recent than december 15 (collcomm) and 21 (ptop). Since I asked for my name to be on the mailing lists and have seen nothing I assume that things have been quiet since then. Al Geist's proposal (Dec. 5) for collective communication and the reasoning behind it seems to provide a resonable starting point for the discussion of interface and functionality. I have only a few minor comments in this regard, but given that the efficiency of collective communications is critically sensitive to hardware topology it *must* be essential to more closely integrate the definition of process groups with topology. I restrict my comments here to this subject. For example, on the Touchstone Delta efficient sub-group global-ops would suggest that process groups map as best possible to square sub-meshes, on the iPSC as sub-cubes, on the KSR as sub-rings. Currently, if one's interest is in performing efficient collective communication in subgroups, there is no way of performing this mapping in a portable way. In this instance one might want something that functions along these lines Create NG process groups with P(0), P(1), ..., P(NG-1) processes in each group and assign each process to one of these groups so that collective communication within each (and perhaps also between all) subgroup is optimized. Such a mapping might also be readily accomodated as a sub-partitioning of an existing process group, with the default being ALL. I could envisage writing, for instance, a fast-multipole integration using this functionality. Comments? Robert J. Harrison Mail Stop K1-90 tel: 509-375-2037 Battelle Pacific Northwest Laboratory fax: 509-375-6631 P.O. Box 999, Richland WA 99352 E-mail: rj_harrison@pnl.gov From owner-mpi-ptop@CS.UTK.EDU Fri Jan 1 11:53:58 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA16856; Fri, 1 Jan 93 11:53:58 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA13825; Fri, 1 Jan 93 11:53:48 -0500 X-Resent-To: mpi-ptop@CS.UTK.EDU ; Fri, 01 Jan 1993 16:53:47 GMT Errors-To: owner-mpi-ptop@CS.UTK.EDU Received: from msr.EPM.ORNL.GOV by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA13817; Fri, 1 Jan 93 11:53:46 -0500 Received: by msr.EPM.ORNL.GOV (5.61/1.34) id AA04566; Fri, 1 Jan 93 11:53:35 -0500 Date: Fri, 1 Jan 93 11:53:35 -0500 From: geist@msr.EPM.ORNL.GOV (Al Geist) Message-Id: <9301011653.AA04566@msr.EPM.ORNL.GOV> To: d3g681@fermi.pnl.gov, littlefield@fermi.pnl.gov, mpi-collcomm@cs.utk.edu, mpi-ptop@cs.utk.edu Subject: Re: groups and topology. >I have only a few >minor comments in this regard, but given that the efficiency of >collective communications is critically sensitive to hardware topology >it *must* be essential to more closely integrate the definition of >process groups with topology. >Currently, if one's interest is in performing efficient collective >communication in subgroups, there is no way of performing this mapping >in a portable way. It is critical that MPI be portable even if efficiency suffers. Portability is primary reason for having a standard. Efficiency is important and tightly coupled to the implementation on a given vendor's machine. My feeling is that our MPI work should specify the functionality at the user level and not dictate how MPI is implemented underneath. Mapping is the key word in integrating topology and groups, and mapping is not defined (so far) in MPI. It is related to the spawning and placement of tasks. I can envision some implementations allowing tasks to migrate to improve load balance and fault tolerance. This greatly compounds the mapping problem, but I don't think MPI should exclude such implementations. The hope would be that vendors would supply MPI implementations that map process number to node number in a way that their collective routines would be efficient with default ALL group AND that the vendor's mapping would be documented so that a user could specify subgroups that could exploit this same efficiency. Al Geist From owner-mpi-ptop@CS.UTK.EDU Mon Jan 4 06:22:14 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA06430; Mon, 4 Jan 93 06:22:14 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA03279; Mon, 4 Jan 93 06:21:55 -0500 X-Resent-To: mpi-ptop@CS.UTK.EDU ; Mon, 04 Jan 1993 11:21:50 GMT Errors-To: owner-mpi-ptop@CS.UTK.EDU Received: from gmdzi.gmd.de by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA03271; Mon, 4 Jan 93 06:21:47 -0500 Received: from f1neuman.gmd.de (f1neuman) by gmdzi.gmd.de with SMTP id AA17137 (5.65c/IDA-1.4.4 for ); Mon, 4 Jan 1993 12:21:14 +0100 Received: by f1neuman.gmd.de id AA14884; Mon, 4 Jan 1993 12:20:29 +0100 Date: Mon, 4 Jan 1993 12:20:29 +0100 From: Rolf.Hempel@gmd.de Message-Id: <9301041120.AA14884@f1neuman.gmd.de> To: mpi-ptop@cs.utk.edu Subject: Agenda for subcommittee meeting Cc: gmap10@f1neuman.gmd.de Dear All, in my message of Dec. 21st I asked you for comments on the agenda I proposed for our working group meeting in Dallas. Since I did not get any response, I guess that you don't disagree too much. I am looking forward too seeing you all in Dallas. Rolf From owner-mpi-ptop@CS.UTK.EDU Tue Jan 19 06:28:43 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA01032; Tue, 19 Jan 93 06:28:43 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA08439; Tue, 19 Jan 93 06:28:14 -0500 X-Resent-To: mpi-ptop@CS.UTK.EDU ; Tue, 19 Jan 1993 06:28:13 EST Errors-To: owner-mpi-ptop@CS.UTK.EDU Received: from gmdzi.gmd.de by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA08431; Tue, 19 Jan 93 06:28:08 -0500 Received: from f1neuman.gmd.de (f1neuman) by gmdzi.gmd.de with SMTP id AA20278 (5.65c/IDA-1.4.4 for ); Tue, 19 Jan 1993 12:27:30 +0100 Received: by f1neuman.gmd.de id AA13250; Tue, 19 Jan 1993 12:26:35 +0100 Date: Tue, 19 Jan 1993 12:26:35 +0100 From: Rolf.Hempel@gmd.de Message-Id: <9301191126.AA13250@f1neuman.gmd.de> To: mpi-ptop@cs.utk.edu Subject: next activities Cc: gmap10@f1neuman.gmd.de Dear All, this time it's my turn to fight against a bad cold, but I think I'll make it. We should plan the work our group has to do before the next Dallas meeting. At the last meeting some points were brought up in discussions, which we should invest some thoughts into: 1. If more than one topology is assigned to a set of processes (i.e., there are two groups with identical membership, and a topology is assigned to both groups), then it might be useful to do the placement of processes (mapping) only according to one topology, and then state how the logical process coordinates of the second topology should correspond to the logical coordinates of the first one. This was the idea of Marc Snir, whereas I favoured the following point of view: for both topologies the assignment of processes to positions within the topology should be based on that topology alone. As a consequence the mapping can be optimized for both topologies. On the other hand, the roles a process plays in both topologies are not coordinated. A third way could be to specify both topologies together, including their alignment between each other. It would then be the (nontrivial) task of the system to assign the processes in a clever way. Also, we would have to think about how the specification in this case could look like. Any ideas? 2. As it stands now, processes in a group get a number 0 - n-1 following an arbitrary scheme. Once a topology is in place, it would be a good idea to base the numbering on the topology (e.g. run through a grid row/column - wise). I see two alternatives how this can be done: a) The numbering is defined only after the topology definition. This means that there is no group rank without a topology, which contradicts our goal to have a topology as an optional attribute to a group. b) The group rank of a process changes with the topology definition. This might cause some confusion among applications programmers. For example, global gather operations before and after the topology definition would lead to different ordering of data in the buffer. On the other hand, there seems to be no conflict with other MPI features. What do you think? 3. Should there be any special topology definition / look up functions for trees? How should they look like? Since Jon brought this up at our meeting, I'm most confident to get some input from him in this matter. Does anybody have brilliant suggestions? 4. Bill Gropp claimed that topology mapping could be done in a portable way if there are some inquiry functions about the hardware topology. Are we able to define a set of such inquiry functions which meet the following requirements: a) they must provide all information necessary for a portable mapping tool for arbitrary application topologies. b) they must be applicable to any weird hardware interconnect topology. Frankly, I have difficulties with this, but perhaps somebody has a good idea. 5. - n. Did I forget anything? I will work the results of the last meeting into the document on virtual topologies until end of next week and send it out to everybody. Rolf From owner-mpi-ptop@CS.UTK.EDU Tue Jan 19 13:53:39 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA22518; Tue, 19 Jan 93 13:53:39 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA27886; Tue, 19 Jan 93 13:53:14 -0500 X-Resent-To: mpi-ptop@CS.UTK.EDU ; Tue, 19 Jan 1993 13:53:13 EST Errors-To: owner-mpi-ptop@CS.UTK.EDU Received: from fslg8.fsl.noaa.gov by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA27878; Tue, 19 Jan 93 13:53:11 -0500 Received: by fslg8.fsl.noaa.gov (5.57/Ultrix3.0-C) id AA26554; Tue, 19 Jan 93 18:53:07 GMT Received: by macaw.fsl.noaa.gov (4.1/SMI-4.1) id AA19368; Tue, 19 Jan 93 11:52:05 MST Date: Tue, 19 Jan 93 11:52:05 MST From: hender@macaw.fsl.noaa.gov (Tom Henderson) Message-Id: <9301191852.AA19368@macaw.fsl.noaa.gov> To: mpi-ptop@cs.utk.edu Subject: Re: next activities > 1. If more than one topology is assigned to a set of processes (i.e., > there are two groups with identical membership, and a topology is > assigned to both groups), then it might be useful to do the placement > of processes (mapping) only according to one topology, and then state > how the logical process coordinates of the second topology should > correspond to the logical coordinates of the first one. > > This was the idea of Marc Snir, whereas I favoured the following > point of view: for both topologies the assignment of processes > to positions within the topology should be based on that topology > alone. As a consequence the mapping can be optimized for both > topologies. On the other hand, the roles a process plays in both > topologies are not coordinated. > > A third way could be to specify both topologies together, including > their alignment between each other. It would then be the (nontrivial) > task of the system to assign the processes in a clever way. Also, > we would have to think about how the specification in this case > could look like. > > Any ideas? I'm kind of leaning towards the second option, though I might be swayed if I could see an example of code that could take advantage of Marc's idea. Any good examples out there? At the end of the last meeting, a suggestion was made that group creation and topology creation be married. A group would always have a topology associated with it at creation. A default topology of "linear" or "ring" might be supported. If this idea is adopted, then it seems to me that each group would have one and only one topology. There is no reason that multiple groups could not have the same membership. Each of these groups could have different topologies. I think this ends up being the second idea. > 2. As it stands now, processes in a group get a number 0 - n-1 following > an arbitrary scheme. Once a topology is in place, it would be a good > idea to base the numbering on the topology (e.g. run through a grid > row/column - wise). I see two alternatives how this can be done: > a) The numbering is defined only after the topology definition. > This means that there is no group rank without a topology, which > contradicts our goal to have a topology as an optional attribute > to a group. > b) The group rank of a process changes with the topology definition. > This might cause some confusion among applications programmers. > For example, global gather operations before and after the > topology definition would lead to different ordering of data in > the buffer. On the other hand, there seems to be no conflict with > other MPI features. > What do you think? I would prefer to see topology inquiry routines that return the "pid" of a process specified by logical coordinates. Inverse routines would also have to be provided. I think that this is safer than either "a" or "b". If topology and group creation are married, then option "a" is automatic. (Actually, this is a good argument for combining group and topology.) I don't have any brilliant (or even reasonably sensible) ideas about items 3 or 4 yet. > ... > > Rolf > Hope you get over your cold soon! Tom Henderson hender@fsl.noaa.gov From owner-mpi-ptop@CS.UTK.EDU Wed Jan 20 05:13:45 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA11399; Wed, 20 Jan 93 05:13:45 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA02944; Wed, 20 Jan 93 05:13:23 -0500 X-Resent-To: mpi-ptop@CS.UTK.EDU ; Wed, 20 Jan 1993 05:13:22 EST Errors-To: owner-mpi-ptop@CS.UTK.EDU Received: from gmdzi.gmd.de by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA02935; Wed, 20 Jan 93 05:13:17 -0500 Received: from f1neuman.gmd.de (f1neuman) by gmdzi.gmd.de with SMTP id AA16345 (5.65c/IDA-1.4.4 for ); Wed, 20 Jan 1993 11:12:40 +0100 Received: by f1neuman.gmd.de id AA16629; Wed, 20 Jan 1993 11:11:44 +0100 Date: Wed, 20 Jan 1993 11:11:44 +0100 From: Rolf.Hempel@gmd.de Message-Id: <9301201011.AA16629@f1neuman.gmd.de> To: mpi-ptop@cs.utk.edu Subject: topologies and groups Cc: gmap10@f1neuman.gmd.de I'm not sure whether we really want to have a default topology. I see some problems arising from that. 1. In some applications it might be completely unimportant how the processes are mapped. A default topology then adds an unnecessary overhead in group creation. An arbitrary numbering would be much better in this case. 2. MPI functions for group creation and topology assignment cannot be separated. Otherwise the system does not know whether it should apply the default topology (another topology could be defined later by the user). I think that especially those people who are not completely convinced of the value of the topology stuff would not like to see those two concepts integrated into the same functions. I favour the following strategy: A group is created without topology (how this is done is a separate issue which we have to discuss with the CollComm people). An arbitrary numbering is chosen by the system. Collective communications at this point follows the arbitrary numbering. A topology definition call is a synchronization point for all processes of the group. The numbering of processes is changed according to the topology. Consistency of numbering is guaranteed because of the synchronization. If applications people want to avoid the different numbering schemes to be used at different phases of their application, they just have to apply the topology before they do any collective communication. Any opinions? There will be some functions which combine the creation of groups and topologies, but they can be optional. An example for this is the subgroup creation along coordinate lines in a cartesian topology. We have to talk to the CollComm people about those functions. Does anybody have a good idea for another topology based process group creation function? Rolf From owner-mpi-ptop@CS.UTK.EDU Wed Jan 20 09:56:37 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA10131; Wed, 20 Jan 93 09:56:37 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA19145; Wed, 20 Jan 93 09:55:55 -0500 X-Resent-To: mpi-ptop@CS.UTK.EDU ; Wed, 20 Jan 1993 09:55:54 EST Errors-To: owner-mpi-ptop@CS.UTK.EDU Received: from fslg8.fsl.noaa.gov by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA19137; Wed, 20 Jan 93 09:55:52 -0500 Received: by fslg8.fsl.noaa.gov (5.57/Ultrix3.0-C) id AA28601; Wed, 20 Jan 93 14:55:47 GMT Received: by macaw.fsl.noaa.gov (4.1/SMI-4.1) id AA21143; Wed, 20 Jan 93 07:54:46 MST Date: Wed, 20 Jan 93 07:54:46 MST From: hender@macaw.fsl.noaa.gov (Tom Henderson) Message-Id: <9301201454.AA21143@macaw.fsl.noaa.gov> To: mpi-ptop@cs.utk.edu Subject: Re: topologies and groups > ... > 2. MPI functions for group creation and topology assignment cannot be > separated. Otherwise the system does not know whether it should > apply the default topology (another topology could be defined later > by the user). I think that especially those people who are not > completely convinced of the value of the topology stuff would not > like to see those two concepts integrated into the same functions. > ... I'll buy the second point. People who don't need topologies (or think they don't) shouldn't be forced to learn about them. (Just like people who don't ever do collective communication should never have to learn about groups...) > ... > A topology definition call is a synchronization point for all processes > of the group. The numbering of processes is changed according to the > topology. Consistency of numbering is guaranteed because of the > synchronization. If applications people want to avoid the different > numbering schemes to be used at different phases of their application, > they just have to apply the topology before they do any collective > communication. Any opinions? > ... > > Rolf > I'm still uneasy about topology creation routines changing pid's. It seems to me that this would be a likely place for users to make errors. The problem is that I can imagine situations where unsafe code might work on the machine it was developed on (due to "good" luck) and fail when ported to another machine (where the pid renumbering works differently). I know it is not possible to make everything idiot-proof but we may hear this objection when the idea is proposed to the whole committee. Tom From owner-mpi-ptop@CS.UTK.EDU Tue Jan 26 06:23:47 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA27461; Tue, 26 Jan 93 06:23:47 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA26404; Tue, 26 Jan 93 06:23:22 -0500 X-Resent-To: mpi-ptop@CS.UTK.EDU ; Tue, 26 Jan 1993 06:23:20 EST Errors-To: owner-mpi-ptop@CS.UTK.EDU Received: from gmdzi.gmd.de by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA26396; Tue, 26 Jan 93 06:23:01 -0500 Received: from f1neuman.gmd.de (f1neuman) by gmdzi.gmd.de with SMTP id AA17536 (5.65c/IDA-1.4.4 for ); Tue, 26 Jan 1993 12:22:13 +0100 Received: by f1neuman.gmd.de id AA13867; Tue, 26 Jan 1993 12:21:18 +0100 Date: Tue, 26 Jan 1993 12:21:18 +0100 From: Rolf.Hempel@gmd.de Message-Id: <9301261121.AA13867@f1neuman.gmd.de> To: mpi-ptop@cs.utk.edu Subject: Updated working document Cc: gmap10@f1neuman.gmd.de As I promised last week, I have updated the document on process topologies in MPI. With this mail I send you the PostScript file which I compressed and then uuencoded. Any corrections/additions are welcome. 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