Where Does the Performance Go? orWhy Should I Cares About the Memory Hierarchy?

µProc

60%/yr.

(2X/1.5yr)

DRAM

9%/yr.

(2X/10 yrs)

1

10

100

1000

1980

1981

1983

1984

1985

1986

1987

1988

1989

1990

1991

1992

1993

1994

1995

1996

1997

1998

1999

2000

DRAM

CPU

1982

Processor-Memory

Performance Gap:(grows 50% / year)

Performance

Time

“Moore’s Law”

Processor-DRAM Memory Gap (latency)

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