Mon Nov 23 16:03:13 EST 1992 From owner-mpi-lang@CS.UTK.EDU Wed Dec 23 06:11:46 1992 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA08579; Wed, 23 Dec 92 06:11:46 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA10302; Wed, 23 Dec 92 06:11:35 -0500 X-Resent-To: mpi-lang@CS.UTK.EDU ; Wed, 23 Dec 1992 11:11:34 GMT Errors-To: owner-mpi-lang@CS.UTK.EDU Received: from marge.meiko.com by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA10294; Wed, 23 Dec 92 06:11:30 -0500 Received: from hub.meiko.co.uk by marge.meiko.com with SMTP id AA03680 (5.65c/IDA-1.4.4 for ); Wed, 23 Dec 1992 06:11:26 -0500 Received: from float.co.uk (float.meiko.co.uk) by hub.meiko.co.uk (4.1/SMI-4.1) id AA22108; Wed, 23 Dec 92 11:11:20 GMT Date: Wed, 23 Dec 92 11:11:20 GMT From: jim@meiko.co.uk (James Cownie) Message-Id: <9212231111.AA22108@hub.meiko.co.uk> Received: by float.co.uk (5.0/SMI-SVR4) id AA01691; Wed, 23 Dec 92 11:11:09 GMT To: mpi-lang@cs.utk.edu Cc: jim@meiko.co.uk Subject: the mode argument Content-Length: 4763 People, Apologies if this issue has already been addressed. I am working from the Supercomputer draft (ORNL/TM-12231 October 1992). Since there appears to have been no mail in the language binding sub-group I assume that that area remains the same. Use of character strings for mode. ================================== The mode argument to the communication routines is described throughout the draft as a character string. I believe this is a BAD IDEA for the following reasons (in no particular priority order) :- Arguments against using strings =============================== 1) Passing strings will produce slower code 2) Passing strings will produce larger code 3) Passing strings makes a portable implementation more difficult because there is no standard way of passing strings from Fortran to C. 1) Code is slower. The library routine must determine what the actual mode is. If the mode argument is a string this should be implemented as a string compare. This will normally require a function call (and probably more than one), since the code will be something like char * mode; if (strcmp(mode,"blocking") == STRINGEQUAL) {} else if (strcmp(mode,"nonblocking") == STRINGEQUAL) {} else if (strcmp(mode,"synchronous") == STRINGEQUAL) {} else error(...) This is hugely slower than int mode; switch (mode) { case MPI_BLOCKING: case MPI_NONBLOCKING: case MPI_SYNCHRONOUS: default: } On a RISCy machine, even unpleasant code like char * mode; switch(*mode) { case 'b': /* Assume blocking */ case 'n': /* Assume non-blocking */ case 's': /* Assume synchronous */ } will be slower than the integer case above since loading the address of a string to pass it normally takes two instructions, while loading a small integer constant takes one. Also there's an extra store access to pick up the first byte of the string (almost certainly from an area which won't be in the cache), whereas the switch on the integer value will already have the value in a register. 2) Code is larger. Just because of all the extra strings which will be placed in the data segment. 3) A portable implementation is harder. A natural way to implement the library is to implement it in C, and then provide a Fortran binding. This is made harder when strings are passed as arguments, since the Fortran and C string conventions are entirely different. In the general case this requires that the whole string be copied when calling a C routine from Fortran and passing a string as an argument. This will have a bad effect on latency. Arguments for using strings =========================== 1) User code is easier to understand 2) Additional possibilities are easier to add 3) There is no standard way of including PARAMETER definitions in Fortran 77. 1) User code is easier to understand IMHO MPI_RECV ( MPI_BLOCKING, ...); is just as easy to understand as MPI_RECV ( "blocking", ...); though I agree that MPI_RECV ( 0 , ...); is extremely opaque. The solution to this is NOT to define the actual values which are used to represent the various tokens, but rather to specify only symbolic names and the include file name. Portable programs must not then make assumptions about the actual values used. In ANSI C it would actually be possible to define the modes as an enumeration type. In conjunction with appropriate prototype definitions for the library functions this should cause type warnings on usage like the last example. (Since the 0 is implicitly an int, rather than an enum mpi_mode) 2) Additional possibilities are easier to add It is true that strings allow vendor options to be more securely added (e.g. "meiko_fastsend") but 1) do we want to permit such things ? Any programs which use these features will be neither conformant nor portable. (Though of course we can't stop them). 2) we have (at least) 2**32 possible modes anyway. If we reserve 0 <= mode <= 256 for standard sepcified use, and allow other people to choose RANDOM other numbers, the chances of collision are extremely low. (Of course we could recommend the dollar bill solution, which generates large guaranteed unique numbers at the cost of $1 for each number). 3) There is no standard way of including PARAMETER definitions in Fortran 77. This is true and a pain. However Fortran 90 provides modules which overcome this. I don't think this is a sufficiently strong argument Thoughts ? Feedback ? Flames ? -- Jim James Cownie Meiko Limited 650 Aztec West Bristol BS12 4SD England Phone : +44 454 616171 FAX : +44 454 618188 E-Mail: jim@meiko.co.uk or jim@meiko.com From owner-mpi-lang@CS.UTK.EDU Mon Jan 4 09:32:49 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA19838; Mon, 4 Jan 93 09:32:49 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA09250; Mon, 4 Jan 93 09:32:41 -0500 X-Resent-To: mpi-lang@CS.UTK.EDU ; Mon, 04 Jan 1993 14:32:40 GMT Errors-To: owner-mpi-lang@CS.UTK.EDU Received: from marge.meiko.com by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA09242; Mon, 4 Jan 93 09:32:36 -0500 Received: from hub.meiko.co.uk by marge.meiko.com with SMTP id AA07241 (5.65c/IDA-1.4.4); Mon, 4 Jan 1993 09:32:32 -0500 Received: from float.co.uk (float.meiko.co.uk) by hub.meiko.co.uk (4.1/SMI-4.1) id AA15874; Mon, 4 Jan 93 14:32:28 GMT Date: Mon, 4 Jan 93 14:32:28 GMT From: jim@meiko.co.uk (James Cownie) Message-Id: <9301041432.AA15874@hub.meiko.co.uk> Received: by float.co.uk (5.0/SMI-SVR4) id AA02690; Mon, 4 Jan 93 14:31:52 GMT To: mpi-pt2pt@cs.utk.edu, mpi-lang@cs.utk.edu Subject: Profilers etc. Content-Length: 2528 Gentlepeople, I have an implementation issue which I would like to raise in the MPI forum, since it is unclear where it fits into the sub-committee structure I have mailed to both mpi-pt2pt and mpi-lang. Apologies to those of you who receive this message twice. Issue ===== The major objective of MPI1 is to achieve portability of applications. This has major benefits for us all (not least in legitimising and therefore growing the MPP marketplace). One of the benefits which it would also be nice to achieve would be the wide availability of different tools which support programming in the MPI1 model. The most immediately obvious such tools (to me at least !) are 1) HPF to Fortran + MPI1 translators 2) Performance monitoring/tuning tools 3) Debuggers Support for the first is easy (since it just requires what we're already doing). Portable support for the second is not so trivial, since the collection of useful performance information is much more intrusive. Portable support for the third is harder still, and I won't discuss it further. Options ======= We have various possible options which we can take. 1) Ignore the problem Provide no support for portable performance monitoring tools, and leave each tool provider with a large porting problem. I don't like this solution, it loses some of the benefit of the standard, which should be attracting people to build tools. 2) Document specific implementation hooks as part of MPI1. In effect these would be callbacks from the library to profiling code which could then do whatever it liked. 3) As 2, but without REQUIRING that a conforming implementation provide the functions. They're there as a recommendation, rather than being mandatory. I think we should be concerned about this, and I'd like us at least to make some recommendation. Personally I'd probably implement two separate interface to the library, one of which provided the hooks, and the other of which didn't so that you don't pay the cost of checking the profiling hooks unless you asked to. Of course even if we do nothing it's not too hard to escape (using horrible macros) in C, but Fortran doesn't always have macros, so a properly specified internal solution is definitely preferable. Thoughts ??? Flame me at Dallas. I'm travelling tomorrow. When are we having a meeting in Europe ??? -- Jim James Cownie Meiko Limited 650 Aztec West Bristol BS12 4SD England Phone : +44 454 616171 FAX : +44 454 618188 E-Mail: jim@meiko.co.uk or jim@meiko.com From owner-mpi-lang@CS.UTK.EDU Wed Feb 3 11:48:30 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA16901; Wed, 3 Feb 93 11:48:30 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA07042; Wed, 3 Feb 93 11:48:05 -0500 X-Resent-To: mpi-lang@CS.UTK.EDU ; Wed, 3 Feb 1993 11:48:04 EST Errors-To: owner-mpi-lang@CS.UTK.EDU Received: from NA-GW.CS.YALE.EDU by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA07034; Wed, 3 Feb 93 11:48:03 -0500 Received: from YOGI.NA.CS.YALE.EDU by CASPER.NA.CS.YALE.EDU via SMTP; Wed, 3 Feb 1993 11:47:59 -0500 Received: by YOGI.NA.CS.YALE.EDU (Sendmail-5.65c/res.client.cf-3.5) id AA00312; Wed, 3 Feb 1993 11:47:56 -0500 Date: Wed, 3 Feb 1993 11:47:56 -0500 From: berryman-harry@CS.YALE.EDU (Harry Berryman) Message-Id: <199302031647.AA00312@YOGI.NA.CS.YALE.EDU> To: mpi-lang@cs.utk.edu Subject: Stirring up trouble Ladies and Gentlemen, This committee has been (appropriately) quiet the last several months. It is, however, time to make some noise. I submit the following not for your approval, but to stimulate the discussion. I will be disappointed if much of what I propose lives as long as the committee draft proposal. Although the comments pertain to C and F77, we might also consider other languages such as C++, Fortran 90, Ada, and ML. ----------------------------------------------------------------------------- This committee exists to insure that the design of MPI is consistent with the standards of the target languages (Fortran 77 and ANSI-C), and that the two interfaces are consistent with each other. I view our role to be the "Style Police" of the MPI committee. It is therefore appropriate to suggest to the committee a list of pitfalls to avoid. 1) Strings have no place in the parameter lists of MPI calls. The internal representation of strings is different in F77 and C. Using strings in the interface can only cause trouble. 2) The availability of macros in Fortran cannot be assumed. Although most Fortran compilers allow the use of cpp, the Fortran 77 standard does not require this. (Some of the functionality of macros can be had by using "parameters" in F77, but this only allows the binding of constants to symbols.) 3) As much as possible, the MPI names should be the same in both F77 and C. 4) Identifiers (e.g., function names) must be valid both in C and F77. Fortran is far more restrictive on this than C is. The F77 standard dictates that variables, function names, and subroutine names, be distinct in the first six characters. 5) Using integers in Fortran as handles to keep track of structures and pointers to structures is consistent with common F77 programming style and the F77 standard. Any Other No-Nos for the committee as a whole? -scott berryman Chair, Language Binding Yale University Computer Science Department and NASA Langley Research Center From owner-mpi-lang@CS.UTK.EDU Wed Feb 3 12:00:25 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA17440; Wed, 3 Feb 93 12:00:25 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA07728; Wed, 3 Feb 93 12:00:11 -0500 X-Resent-To: mpi-lang@CS.UTK.EDU ; Wed, 3 Feb 1993 12:00:10 EST Errors-To: owner-mpi-lang@CS.UTK.EDU Received: from marge.meiko.com by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA07710; Wed, 3 Feb 93 12:00:05 -0500 Received: from hub.meiko.co.uk by marge.meiko.com with SMTP id AA18122 (5.65c/IDA-1.4.4 for ); Wed, 3 Feb 1993 12:00:00 -0500 Received: from float.co.uk (float.meiko.co.uk) by hub.meiko.co.uk (4.1/SMI-4.1) id AA28075; Wed, 3 Feb 93 16:59:49 GMT Date: Wed, 3 Feb 93 16:59:48 GMT From: jim@meiko.co.uk (James Cownie) Message-Id: <9302031659.AA28075@hub.meiko.co.uk> Received: by float.co.uk (5.0/SMI-SVR4) id AA03458; Wed, 3 Feb 93 16:58:10 GMT To: berryman-harry@CS.YALE.EDU Cc: mpi-lang@cs.utk.edu In-Reply-To: Harry Berryman's message of Wed, 3 Feb 1993 11:47:56 -0500 <199302031647.AA00312@YOGI.NA.CS.YALE.EDU> Subject: Stirring up trouble Content-Length: 946 > Any Other No-Nos for the committee as a whole? 6) The underscore character (`_') is NOT included in the FORTRAN 77 character set. 7) In a standard conforming FORTRAN 77 program a subprogram only ever has one type signature for its arguments. We should also concern ourselves somewhat with Fortran 90. A FORTRAN 77 binding (though compatible with Fortran 90) is NOT what is really required for a Fortran 90 binding. In particular Fortran 90 allows various options which may be useful (optional arguments, named arguments), and provides whole new areas of complexity (POINTERs, structures etc.) which will not have been addressed by the FORTRAN 77 binding. -- Jim James Cownie Meiko Limited Meiko Inc. 650 Aztec West Reservoir Place Bristol BS12 4SD 1601 Trapelo Road England Waltham MA 02154 Phone : +44 454 616171 +1 617 890 7676 FAX : +44 454 618188 +1 617 890 5042 E-Mail: jim@meiko.co.uk or jim@meiko.com From owner-mpi-lang@CS.UTK.EDU Wed Feb 3 14:28:49 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA21025; Wed, 3 Feb 93 14:28:49 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA14904; Wed, 3 Feb 93 14:28:29 -0500 X-Resent-To: mpi-lang@CS.UTK.EDU ; Wed, 3 Feb 1993 14:28:27 EST Errors-To: owner-mpi-lang@CS.UTK.EDU Received: from NA-GW.CS.YALE.EDU by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA14896; Wed, 3 Feb 93 14:28:26 -0500 Received: from YOGI.NA.CS.YALE.EDU by CASPER.NA.CS.YALE.EDU via SMTP; Wed, 3 Feb 1993 14:28:24 -0500 Received: by YOGI.NA.CS.YALE.EDU (Sendmail-5.65c/res.client.cf-3.5) id AA00671; Wed, 3 Feb 1993 14:28:23 -0500 Date: Wed, 3 Feb 1993 14:28:23 -0500 From: berryman-harry@CS.YALE.EDU (Harry Berryman) Message-Id: <199302031928.AA00671@YOGI.NA.CS.YALE.EDU> To: mpi-lang@cs.utk.edu Subject: Optional arguments I'm of the opinion that optional arguments should be discounted because F77 doesn't support them, and we want all of the interfaces to be as much alike as possible. Unfortunately, making the interface consistent with F77 and C is pretty restrictive. Do we want to keep this as a general principle? -scott berryman chairthing From owner-mpi-lang@CS.UTK.EDU Wed Feb 3 15:12:38 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA22300; Wed, 3 Feb 93 15:12:38 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA17335; Wed, 3 Feb 93 15:12:21 -0500 X-Resent-To: mpi-lang@CS.UTK.EDU ; Wed, 3 Feb 1993 15:12:20 EST Errors-To: owner-mpi-lang@CS.UTK.EDU Received: from timbuk.cray.com by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA17327; Wed, 3 Feb 93 15:12:18 -0500 Received: from teak18.cray.com by cray.com (4.1/CRI-MX 2.10) id AA03650; Wed, 3 Feb 93 14:12:15 CST Received: by teak18.cray.com id AA05975; 4.1/CRI-5.6; Wed, 3 Feb 93 14:12:10 CST From: par@teak.cray.com (Peter Rigsbee) Message-Id: <9302032012.AA05975@teak18.cray.com> Subject: Re: Optional arguments To: mpi-lang@cs.utk.edu Date: Wed, 3 Feb 93 14:12:05 CST X-Mailer: ELM [version 2.3 PL11b-CRI] Scott Berryman writes: > > Unfortunately, making the interface consistent with F77 and C is pretty > restrictive. Do we want to keep this as a general principle? > It seems to me that most of the restrictions seem to effect the F77 interfaces. C seems pretty flexible, especially with "void *" in ANSI C. (I don't have your other mail messages right at hand, so don't remember specifics.) Adhering to the F77 standard has its advantages, not the least of which is that it is easy to define and you can make a good argument for. Unfortunately, I think this will have us end up with the same kinds of cryptic function names that are found in other portable libraries. And if we do end up with lots of subtle variations on send and receive, trying to remember the difference between SNPAHP and SNPHAP (choosing two strings at random ;-) will get pretty difficult. Pragmatically, though, it is my sense that most of the Fortran 77 compilers available on the market, especially on newer systems, have gone beyond the standard in a number of areas (especially names). Given the competitive pressures to compile existing code, I think it would be hard for a hardware or software vendor today to offer, for example, a Fortran compiler that restricted function names to the 6 character limit. So I think it would be more useful if we were to propose, at least for Fortran 77, interfaces that matched this more realistic "standard". Restrict things where true portability will differ, not just where the formal standard is limiting. Another way to look at this is that if the interfaces must adhere to the lowest common denominator, then we should define this based on the set of likely target systems, and not simply on the standard. Then let people (members of the MPI group, people who review the spec, etc.) come back with specific arguments about where and why particular aspects are in fact non-portable. Some areas where, as a user, I see restrictions as being unnecessary might include: - maximum length of name (32? 16?) - use of underscores in name - an argument can only be of one type I think the net result would be an interface that would be more easily understood and more usable. - Peter Rigsbee From owner-mpi-lang@CS.UTK.EDU Mon Feb 8 14:14:34 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA04248; Mon, 8 Feb 93 14:14:34 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA08480; Mon, 8 Feb 93 14:14:21 -0500 X-Resent-To: mpi-lang@CS.UTK.EDU ; Mon, 8 Feb 1993 14:14:20 EST Errors-To: owner-mpi-lang@CS.UTK.EDU Received: from NA-GW.CS.YALE.EDU by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA08472; Mon, 8 Feb 93 14:14:18 -0500 Received: from YOGI.NA.CS.YALE.EDU by CASPER.NA.CS.YALE.EDU via SMTP; Mon, 8 Feb 1993 14:14:15 -0500 Received: by YOGI.NA.CS.YALE.EDU (Sendmail-5.65c/res.client.cf-3.5) id AA11866; Mon, 8 Feb 1993 14:14:12 -0500 Date: Mon, 8 Feb 1993 14:14:12 -0500 From: berryman-harry@CS.YALE.EDU (Harry Berryman) Message-Id: <199302081914.AA11866@YOGI.NA.CS.YALE.EDU> To: mpi-lang@CS.UTK.EDU Subject: Why not both? I also tend to chaff under the restriction of the F77 variable name requirements. But, on the other hand, I'd hate to have everyone hate use for not being consistent with the standard. (BTW the ANSI C standard is 32 chars, counting an implied leading underscore.) Perhaps a compromise would be to have the standard written in terms of a 31 char limit, but supply another interface which was consistent with the F77 standard, but functionally equivelent. Obviously this would double the number of routines in the standard. -scott From owner-mpi-lang@CS.UTK.EDU Mon Feb 8 14:40:36 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA04760; Mon, 8 Feb 93 14:40:36 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA09906; Mon, 8 Feb 93 14:40:26 -0500 X-Resent-To: mpi-lang@CS.UTK.EDU ; Mon, 8 Feb 1993 14:40:25 EST Errors-To: owner-mpi-lang@CS.UTK.EDU Received: from ssdintel.ssd.intel.com by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA09887; Mon, 8 Feb 93 14:40:22 -0500 Received: from tualatin.SSD.intel.com by SSD.intel.com (4.1/SMI-4.1) id AA05139; Mon, 8 Feb 93 11:40:15 PST Date: Mon, 8 Feb 93 11:40:15 PST Message-Id: <9302081940.AA05139@SSD.intel.com> Received: by tualatin.SSD.intel.com (4.1/SMI-4.0) id AA00559; Mon, 8 Feb 93 11:39:51 PST From: Bob Knighten Sender: knighten@SSD.intel.com To: berryman-harry@CS.YALE.EDU Cc: mpi-lang@CS.UTK.EDU Subject: Re: Why not both? In-Reply-To: <199302081914.AA11866@YOGI.NA.CS.YALE.EDU> References: <199302081914.AA11866@YOGI.NA.CS.YALE.EDU> Reply-To: knighten@SSD.intel.com (Bob Knighten) The one place where the P1003.9 standard (POSIX FORTRAN 77 Language Interfaces - Part 1: Binding for System API) which specifies a F77 binding to the POSIX system interfaces violates the FORTRAN 77 standard is in name length. There was no significant opposition because of this. -- Bob Robert L. Knighten | knighten@ssd.intel.com Intel Supercomputer Systems Division | 15201 N.W. Greenbrier Pkwy. | (503) 629-4315 Beaverton, Oregon 97006 | (503) 629-9147 [FAX] From owner-mpi-lang@CS.UTK.EDU Wed Feb 10 16:46:22 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA04990; Wed, 10 Feb 93 16:46:22 -0500 Received: from localhost by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA24116; Wed, 10 Feb 93 16:46:04 -0500 X-Resent-To: mpi-lang@CS.UTK.EDU ; Wed, 10 Feb 1993 16:46:03 EST Errors-To: owner-mpi-lang@CS.UTK.EDU Received: from ssdintel.ssd.intel.com by CS.UTK.EDU with SMTP (5.61++/2.8s-UTK) id AA24080; Wed, 10 Feb 93 16:45:38 -0500 Received: from tualatin.SSD.intel.com by SSD.intel.com (4.1/SMI-4.1) id AA14891; Wed, 10 Feb 93 13:45:36 PST Date: Wed, 10 Feb 93 13:45:36 PST Message-Id: <9302102145.AA14891@SSD.intel.com> Received: by tualatin.SSD.intel.com (4.1/SMI-4.0) id AA03909; Wed, 10 Feb 93 13:45:33 PST From: Bob Knighten Sender: knighten@SSD.intel.com To: mpi-formal@cs.utk.edu, mpi-lang@cs.utk.edu Subject: POSIX LIS Reply-To: knighten@SSD.intel.com (Bob Knighten) As part of the POSIX work a "Draft TCOS-SSC Technical Report -- Programming Language Independent Specification Methods" was written. This has served as the basis for the language independent specification of the various system interfaces that have been developed. This is *NOT* a formal specification method, but has as its purpose "to assist and coordinate the development of functional specifications and language bindings by defining an abstract model, and providing guidelines for the use of that model in the development of new functional specifications, the dirivation of a base standard from an existing language binding, and the development of new language bindings to a functional specification." "The model is primarily intended for use in developing language-independent specifications for operating system and related services, and language bindings for procedural programming languages." [The quotation is from the Scope and Purpose of the report.] This guide was never completely finished and Paul Rabin (OSF), the principal author, recommends that it be used in conjunction with the P1003.1LIS which provides a very large example. Paul Rabin expects that some extensions to the current guide will be necessary for MPI, just as extensions will be necessary for the POSIX Real-Time and Threads work. He is interested in working with us to develop common extensions. I can provide copies of the POSIX LIS and both the P1003.1 LIS and the P1003.16 C binding to the P1003.1 LIS as well. [P1003.1LIS is about 380 pages and P1003.16 is about 300 pages so I don't want to drop these books on people unless they are actually desired.] A formal specification of MPI is quite desirable, but I am doubtful that we can achieve it in the time we have available. A language independent specification of the sort developed within POSIX is, I believe, essential to provide the common base for all of the language bindings we wish to provide. -- Bob Robert L. Knighten | knighten@ssd.intel.com Intel Supercomputer Systems Division | 15201 N.W. Greenbrier Pkwy. | (503) 629-4315 Beaverton, Oregon 97006 | (503) 629-9147 [FAX] From owner-mpi-lang@CS.UTK.EDU Fri Apr 9 13:02:00 1993 Received: from CS.UTK.EDU by surfer.EPM.ORNL.GOV (5.61/1.34) id AA00637; Fri, 9 Apr 93 13:02:00 -0400 Received: from localhost by CS.UTK.EDU with SMTP (5.61+IDA+UTK-930125/2.8s-UTK) id AA28148; Fri, 9 Apr 93 13:01:47 -0400 X-Resent-To: mpi-lang@CS.UTK.EDU ; Fri, 9 Apr 1993 13:01:45 EDT Errors-To: owner-mpi-lang@CS.UTK.EDU Received: from ocfmail.ocf.llnl.gov by CS.UTK.EDU with SMTP (5.61+IDA+UTK-930125/2.8s-UTK) id AA28093; Fri, 9 Apr 93 13:00:56 -0400 Received: by ocfmail.ocf.llnl.gov (4.1/SMI-4.0) id AA25915; Fri, 9 Apr 93 10:00:54 PDT Date: Fri, 9 Apr 93 10:00:54 PDT From: nessett@ocfmail.ocf.llnl.gov (Danny Nessett) Message-Id: <9304091700.AA25915@ocfmail.ocf.llnl.gov> To: mpi-lang@cs.utk.edu, mpi-pt2pt@cs.utk.edu Subject: cross-language support - a proposal (long) Cc: nessett@ocfmail.ocf.llnl.gov I am cross posting this message to the point-to-point list, since it contains a proposed modification to the point-to-point proposal. Those interested in point-to-point, but not language binding issues should skip to section 3, and evaluate whether the changes are acceptable. 1. The Problem -------------- At the recent MPI meeting in Dallas (31 March - 2 April), the language binding subcommittee proposed that the MPI standard make no provision for interoperability between MPI-based programs written in different programming languages. I objected to that suggestion and volunteered to develop a proposal that would allow such language interoperability. My objections were and are based on the following considerations : o MPI is a mulit-use standard, being developed for homogeneous multi- processors, homogeneous computer clusters and heterogeneous distributed systems. The objective is to provide a message passing interface that can be used in all of these environments. In addition, there is an objective to promote portability of MPI-based codes from one environment to another. Correct operation of MPI-based codes in a heterogeneous environment requires the MPI implementation to accommodate different formats for the communicated data. As a side effect, programs written in different programming languages will interoperate as long as the data types are conceptually the same. For example, REALs in Fortran and floats in C are conceptually the same. Unless there is a requirement that MPI support cross-language interoperability, some programs will work in heterogeneous environments, but not work in homogeneous environments. This will give the appearance that MPI is poorly designed. o MPI can be used in at least two different ways. It can be used for intercommunication between application executables that are aware (from the programmer's point of view) of each other's internal data structures and algorithms. It can also be used to provide services, much like a library provides services, in which the internal data structures and algorithms are not visible to the service client. In this second class of use, MPI acts as a generic service interface, supporting a wide variety of applications. Commonly, this generic service interface is known as client/server. Traditionally, libraries define their interface data structures and procedure prototypes in a specific programming language. Some libraries provide multiple interface definitions, one for each particular programming language they support. However, when using a generic service interface to access what is the equivalent of library services, this approach becomes problematic. The MPI interface is itself specified in terms of one or more programming language bindings. There is no useful way to specify another language binding for the client/server interface. Consequently, another approach is used for the client/server interface, which is programming language independent. Generally, server writers specify an interface in terms of a message parameter that represents the function or procedure to execute and in conjunction with a particular value of that parameter, specify a set of parameters that are the function's or procedure's arguments. Note that with a message passing based generic service interface, such as MPI (as opposed to a remote procedure call generic service interface), the service call is not constrained to obey function or procedure semantics, since the client is not obliged to block while the server provides the service. However, that is an aside. Since the server's interface is specified in terms of MPI data types, rather than in terms of the data types of the programming language used to write the server, there is a complete decoupling of the programming language used to write a server from the programming language used to write the client (and vice versa). The server can use one MPI language binding to offer service and the client can use another MPI language binding to access those services. An example may clarify this somewhat. Suppose I wish to write a server that provides a matrix manipulation service. I define my interface as follows : first parameter : operation to be performed (integer) - 1 = matrix sum 2 = matrix multiply 3 = matrix inversion 4 = matrix transposition 5 = return result second parameter: number of rows (integer) in matrix (or matrices) third parameter : number of columns (integer) in matrix (or matrices) fourth parameter: first matrix for all operations (single precision real array, row major order) fifth parameter : second matrix for operations 1 and 2 (single precision real array, row major order) For this interface, the operation and parameters will be specified as MPI data types. For a C or C++ language binding of MPI, these data types will be "int" and "float". For a Fortran language binding of MPI, these data types will be "INTEGER" and "REAL". This means there really is no way to prevent cross language interactions, other than to provide a "caveat emptor" warning to the programmer. Some programmers will not read the manual that closely; will implement a cross language service interface; will use it on various machines with no problems; and finally will curse the MPI implementors when it doesn't work on other machines. This will reduce confidence in MPI as a standard message passing interface. Note the property described in the previous bullet. In a heterogeneous environment, even if both client and server are written in the same language, the MPI implementation must accommodate conversion between different ranges of values for a particular type. For example, if one machine represents integers as 32 bit quantities, while another represents them as 64 bit quantities, sending an integer parameter from the second to the first requires a check to ensure the 64 bit value can be represented as a 32 bit value (e.g., that 100,000 represented as a 64 bit number fits into a 32 bit representation). This check also allows a client written in one language (say, C) to call a server written in another language (say, Fortran). 2. My view of the issues ------------------------ Below I summarize my view of the issues in regards to cross-language MPI service. I am sure that there are other issues that I have not thought of and welcome others to contribute them to the discussion. o As I have stated above, MPI is a multi-use standard being targeted for homogeneous multi-processors, homogeneous computer clusters and heterogeneous distributed systems. Vendor and user communities representing each of these environments are participating in the MPI standardization process. This invariably leads to a conflict of objectives. For example, the community most interested in homogeneous multi-processors does not want to sacrifice the performance of parallel programs running on these machines in order to accommodate heterogenous distributed processing or cross-language MPI support. Alternatively, those interested in heterogenous distributed systems don't want to constrain the MPI standard in such a way that severly limits its applicability in those environments. Those interested in homogeneous computer clusters are probably somewhere in between with their objectives. Consequently, if the MPI standard is to provide cross-language support, it should do so in a way that doesn't penalize the performance of programs running on homogeneous multi-processors, while at the same time minimizing the implementation effort for cross-language and heterogenous distributed system support. Also, programmers who intend to use only one language should not have to think about cross-language issues. o Cross-language support raises the question of translation between data values that are of a fundamentally different type (as opposed to being of a different "kind" in the Fortran 90 sense). For example, should the MPI standard provide support that would allow a Fortran program to send a "complex" value to a program written in C? (By this I mean support the transmission of the Fortran "complex" type to a C program, not the transmission of a "complex" value represented in some user specified way, like two real values). A cross-language facility may or may not allow this, depending on the degree of automation the standard is designed to provide. It is conceivable for a cross-language standard to support the communication of only those data types that are common to all of the target programming languages. There is also the issue of type coercion of transmitted values within a single language. For example C allows you to coerce a real value into an integer value when you assign a real value to an integer variable. Taking this approach would imply a sender could specify a real value in an MPI_ADD_BLOCK call, while the receiver specified an integer variable and expect MPI to perform the conversion. Allowing such coercion in the MPI interface would significantly increase its complexity, since the programmer would now have to specify not only the type being sent or received, but also the type being coerced. For this reason, I believe we have decided not to support such type coercion in MPI. o Translation between values of the same type (but perhaps different "kind") across languages requires knowledge of the mapping between a particular language type and its machine representation. For example, in Fortran 77 a REAL might map to an IEEE 32 and a DOUBLE PRECISION to an IEEE 64. In C a float might map to an IEEE 32, a double to an IEEE 64 and a long double to an IEEE 64. In Fortran 90 a REAL with a given kind parameter might map to either an IEEE 32 or an IEEE 64. Similar mapping of int, long, INTEGER (with different kind parameters in Fortran 90), char, CHARACTER, LOGICAL and COMPLEX to underlying representations is required to properly support cross-language interoperability. Some language types that have been suggested as MPI types would require definition in certain languages. For example, LOGICAL in Fortran has no direct type analog in C. Similarly, there is no COMPLEX data type in C. It would be possible to simply declare use of these MPI types in a program written in an incompatible programming language as erroneous or the standard could specify a mapping between these type and non-native types in the appropriate languages (e.g., LOGICAL could map to unsigned char and COMPLEX to a structure containing two reals). In a heterogeneous environment the mapping information can be more complex. On a SUN Workstation REALs, DOUBLE PRECISIONS, floats, doubles and long doubles may map as specified above. On a CRAY, however, a REAL may map to a CRAY 64, a DOUBLE PRECISION to a CRAY 64, a float to a CRAY 64, a double to a CRAY 64 and a long double to a CRAY 128. o Cross-language interoperability may require an MPI implementation that supports a particular language binding to be aware in some way of the existence of other language bindings. This may cause a problem when new MPI language bindings are developed. The features of MPI that support cross-language interoperability should allow the graceful integration of new language bindings into the standard. 3. A Proposal ------------- In order to support cross-language use of MPI, I propose the following modification to the point-to-point draft. The proposal is in two completely independent parts. One can be accepted without accepting the other. 3.1 First Part Modify the datatype parameter values of the MPI_ADD_... functions so that they come from the following set : MPI_REAL MPI_DOUBLEPRECISION MPI_COMPLEX MPI_INTEGER MPI_LOGICAL MPI_CHARACTER MPI_FLOAT MPI_DOUBLE MPI_LONGDOUBLE MPI_SHORT MPI_INT MPI_LONG MPI_CHAR (a character array) MPI_UCHAR MPI_BYTE These values for the datatype parameter are allowed in any MPI implementation irrespective of its language binding. They specify the type of the data that is being sent/received. Notice that the first group (i.e., MPI_REAL,..., MPI_CHARACTER) are Fortran types; the second group (MPI_FLOAT,...,MPI_UCHAR) are C (C++) types and MPI_BYTE is a language independent type. The use of a type from the first group in a Fortran program indicates that the data being sent/received is in Fortran format and consequently does not require translation. The use of a type from the first group in a C (C++) program indicates that the data being sent/received is in Fortran format and so may require translaton. Similarly, the use of a type from the second group in a Fortran program indicates the data being sent/received is in C (C++) format and so may require translation. The use of a type from the second group in a C program indicates the data being sent/received is in C (C++) format and so need not be translated. A client/server interface would specify its interface in terms of these MPI types. When a MPI_ADD_... function is called, the specified type would be used as the datatype parameter irregardless of the MPI language binding. Thus, if a parameter is specified as MPI_REAL, that datatype would be specified both in Fortran and C programs using the client/server interface. To properly pass messages, both the client and server must use the same datatype for the parameter. In order for the MPI implementation to take advantage of the provided type information in a cross-language communication, it must know which Fortran types map into which C types. Therefore, the standard should specify this information. Let me make the following strawman proposal : MPI_REAL maps to MPI_FLOAT; MPI_DOUBLEPRECISION maps to MPI_DOUBLE; MPI_COMPLEX maps either to a C struct or has no mapping, which would cause an error in a cross-language communication; MPI_INTEGER maps to MPI_INT; MPI_LOGICAL maps to MPI_UCHAR or has no mapping, which would cause an error; and MPI_CHARACTER maps to MPI_CHAR. There are three C types that have no natural analogs in Fortran : MPI_SHORT, MPI_LONG, and MPI_LONGDOUBLE. MPI_SHORT and MPI_LONG probably should map to MPI_INTEGER, since it is the only integer type available in Fortran 77. MPI_LONGDOUBLE probably should map to MPI_DOUBLEPRECISION. However, that means that MPI_DOUBLE and MPI_LONGDOUBLE map to the same Fortran data type. An alternate mapping would map MPI_DOUBLE to MPI_REAL and MPI_LONGDOUBLE to MPI_DOUBLEPRECISION. This requires discussion. In addition to a standard mapping between programming language types, a particular MPI implementation must know how the supported language types map into underlying machine representations. For example, it must know that REAL maps into IEEE 32, int maps into a 32 bit 2's complement value, etc. An MPI implementation would operate as follows. I categorize the implementations by environment in order to demonstrate properties of the previously discussed issues. 3.1.1 Homogeneous Mulit-processors and Computer Clusters -------------------------------------------------------- I describe the behavior of an MPI implementation with a Fortran language binding. The corresponding actions of an MPI implemenation with a C language binding should be obvious. 3.1.1.1 Send If the datatype parameter is in the Fortran set, block copy the data using the underlying system network. If the datatype parameter is in the C set, use the type mapping to decide what is the corresponding Fortran type and use the per implementation machine representation mapping to decide the underlying representation for both the Fortran and C type. If they are the same, block copy the data using the underlying system network. If not, convert the data to the appropriate underlying representation for the C type and send the converted data. 3.1.1.2 Receive If the datatype parameter is in the Fortran set, the buffer in which the data arrived is in the proper format. Make it available to the MPI caller. If the datatype parameter is in the C set, use the type mapping to decide what is the corresponding Fortran type and use the per implementation machine representation maping to decide the underlying representation for both the Fortran and C type. If they are the same, the buffer in which the data arrived is in the proper format. Make it available to the MPI caller. Otherwise, convert the buffer to the appropriate underlying representation and make it available to the MPI caller. A comment on implementation strategy. It is possible for both a send and receive operation to know before hand whether it needs to translate the buffer data or not (i.e., the above algorithms can be run before the actual machine transmission is sent or received). Consequently, in those situations in which translation is necessary, the implementation can supply an intermediate buffer in which to translate or from which to translate the data. By knowing both the Fortran and C types as well as their underlying representations, the implementation can precalculate the size of the translation buffer. 3.1.2 Heterogeneous Distributed Systems --------------------------------------- Supporting MPI communications in a heterogeneous distributed system is more complicated than in a homogeneous environment. Not only must differences in programming language data types be accommodated, differences in underlying machine represenations are also a concern. The exact algorithms to use when sending and receiving depend on the particular presentation-level protocol employed. Protocols like XDR and ASN.1 use a intermediate representation of data for transmission purposes. A protocol like NDR (used in OSF DCE) transmits the data in the format of the sender, placing the burden on the receiver to translate it. In the following discussion I finesse the protocol issue by using the generic description "call the off-machine protocol translation module" to mean execute the appropriate presentation protocol algorithm. Some implementations will combine the protocol translation activity with sending or receiving the data. 3.1.2.1 Send If the datatype parameter is in the Fortran set, determine the underlying machine represenation and call the off-machine protocol translation module to put it into the proper format. Send the result to the receiver. If the datatype parameter is in the C set, use the type mapping to decide what is the corresponding Fortran type. Determine the Fortran type's underlying representation and call the off-machine protocol translation module to put it into the proper format. Send the result to the receiver. 3.1.2.2 Receive If the datatype parameter is in the Fortran set, determine the underlying machine representation and call the off-machine protocol translation module to put it into the proper format. Return this result to the MPI caller. If the datatype parameter is in the C set, use the type mapping to decide what is the corresponding Fortran type. Determine the Fortran type's underlying representation and call the off-machine protocol translation module to put it into the proper format. Return this result to the MPI caller. 3.2 Second Part Cross-language interoperability raises the issue of handling data types in one programming language that have no exact analog in another programming language. With the current suggested language bindings for MPI (i.e., Fortran 77, Fortran 90, C and C++), I think the following types fall into this category, one way or another : Fortran 77 LOGICAL COMPLEX Fortran 90 REAL(SELECTED_REAL_KIND(--,--)) INTEGER(SELECTED_INT_KIND(--)) LOGICAL COMPLEX COMPLEX(SELECTED_REAL_KIND(--,--)) C and C++ types included in the MPI standard have natural analogs in Fortran 77 and Fortran 90. There is at least two ways to handle these type mismatches. The simplest strategy is to generate an error when these types are referenced in an inappropriate language. This approach has the advantage of being simple to implement. It has the disadvantage that MPI-based programs written in one language without thought of using it from a program written in another language will likely use inappropriate types. The second strategy is to define analogs in each language for the non-common types. For example, LOGICAL in both Fortran 77 and Fortran 90 could map to unsigned char in C. COMPLEX in Fortran 77 and Fortran 90 could map to a struct with two float members in C. However, REAL, INT and COMPLEX with KIND parameter information cannot be handled in this way, since the "length" of the type is a machine dependent quantity. For example, on some machines INTEGER(SELECTED_INT_KIND(4)) might be equivalent to an int, while on other machines it is equivalent to a long (and not an int). Similar "length" problems exist with the REAL(SELECTED_REAL_KIND(--,--)) type. With these points in mind I propose the following. Map LOGICAL into unsigned char, COMPLEX into a C struct with two floats and disallow specification of the Fortran 90 types that specify a KIND parameter. Since Fortran 90 supports a KIND function call that the programmer can use to determine when INTEGER and INTERGER(SELECTED_INT_KIND(--)), REAL and REAL(SELECTED_REAL_KIND(--,--)), and COMPLEX and COMPLEX(SELECTED_REAL_KIND(--,--)) are equivalent, there is a work around for most cases. 4. Analysis of the Proposal --------------------------- Following is an analysis of the proposal according to the issues specified in section 2. o As described in section 3.1.1 the proposal can be implemented in such a way that it does not adversely impact the performance of either homogeneous multi-processors or homogeneous computer clusters. The programmer who writes programs in one language need never consider cross- language issues. Furthermore, the MPI types he/she would use would be natural for the programming language in which he/she is working. o The issue of mapping data types not found in one programming language into data types found in another is addressed by the second part, which covers mapping of data types by defining analagous types in the programming language from which a type is missing. Type coercion is not supported between types, since it is simple to first coerce the type (e.g., float to int) before sending it. It is not simple to support this kind of type coercion from within the MPI implementation. o The proposal handles translation of values of the same type by requiring the programmer to specify the type of data in the datatype parameter of the MPI_ADD_... functions. There is a limited amount of translation between types of different kinds due to the mapping required to associate a type in one language with a type in another language. This has the advantage of automating much of the work required to communicate values in a cross-language situation. However, there is also a possible disadvantage. In a heterogeneous distributed system the mapping could lead to the loss of information or to an error. For example, the suggested mapping associates a float with a REAL. On a CRAY a REAL is a 64-bit floating point number, while on a SUN a float is a 32-bit floating point. Transfering a REAL on a CRAY to a float on a SUN causes loss of precision and potentially could result in a translation error because the value on the CRAY cannot be represented by a 32-bit floating point. This problem also occurs on a single machine if a REAL maps to, say, an IEEE 64 and a float to an IEEE 32 (which doesn't seem likely). o Adding a new language binding to the MPI standard requires the definition of new MPI_ values and the mapping between these new values and the existing MPI_ values. Introduction of MPI implementations with support for the new language bindings can be accomplished gradually, since they will support the old MPI_, eventhough the old implementations do not support the new MPI_. As vendors upgrade their MPI implementations to conform to the new language binding standards, the new MPI_s can be used more and more until all useful implementations support them. Thus, the proposal supports the gradual introduction of new language bindings without requiring all implementations to immediately support them. From owner-mpi-lang@CS.UTK.EDU Tue Jun 15 16:12:27 1993 Received: from CS.UTK.EDU by netlib2.cs.utk.edu with SMTP (5.61+IDA+UTK-930125/2.8t-netlib) id AA08770; Tue, 15 Jun 93 16:12:27 -0400 Received: from localhost by CS.UTK.EDU with SMTP (5.61+IDA+UTK-930125/2.8s-UTK) id AA04027; Tue, 15 Jun 93 16:12:39 -0400 X-Resent-To: mpi-lang@CS.UTK.EDU ; Tue, 15 Jun 1993 16:12:36 EDT Errors-To: owner-mpi-lang@CS.UTK.EDU Received: from antares.mcs.anl.gov by CS.UTK.EDU with SMTP (5.61+IDA+UTK-930125/2.8s-UTK) id AA03883; Tue, 15 Jun 93 16:12:09 -0400 Received: from donner.mcs.anl.gov by antares.mcs.anl.gov with SMTP id AA03914 (5.65c/IDA-1.4.4 for ); Tue, 15 Jun 1993 15:11:50 -0500 Message-Id: <199306152011.AA03914@antares.mcs.anl.gov> To: als@cs.umd.edu, snir@watson.ibm.com, otto@cse.ogi.edu Subject: language binding draft Cc: mpi-lang@cs.utk.edu, gropp@mcs.anl.gov Date: Tue, 15 Jun 1993 15:11:46 -0500 From: Rusty Lusk Here is the first draft of part of the language binding chapter. I apologize for the surrounding empty pages. I haven't put together an economical harness yet. Marc, is this the sort of thing you had in mind? I am inexperienced in this area. Please let me know of any omissions besides the obvious one that it is incomplete. I will attempt to address them in the next version. Also, I have not taken notes on all the places where we have said, while discussing something in one of the other committees, "That should be left to the language binding committee." Alan, do you feel comfortable presenting this at the next meeting? I will be unable to be there. I am leaving for Europe on Thursday, so any comments must arrive soon. Steve, if you don't hear from me again before Thursday evening, this is the language binding chapter for the next meeting. 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