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- Xref: sparky comp.arch:10655 comp.benchmarks:1667
- Newsgroups: comp.arch,comp.benchmarks
- Path: sparky!uunet!timbuk.cray.com!walter.cray.com!ferrari!cmg
- From: cmg@ferrari.cray.com (Charles Grassl)
- Subject: Re: DEC ALPHA Performance Claims
- Message-ID: <1992Nov12.091854.22914@walter.cray.com>
- Lines: 41
- Nntp-Posting-Host: ferrari.cray.com
- Reply-To: cmg@magnet.cray.com
- Organization: Cray Research, inc.
- References: <1992Nov11.043149.17257@engage.pko.dec.com> <BxKI38.DM7.2@cs.cmu.edu>
- Date: 12 Nov 92 09:18:53 CST
-
- In article <BxKI38.DM7.2@cs.cmu.edu>, lindsay+@cs.cmu.edu (Donald Lindsay) writes:
- >>
- >>System 100x100 dp 1000x1000 dp
- >>
- >Compaq Deskpro 486/33 1.4
- >DEC 5000/200 (25 MHz R3000) 3.7
- >Cray-1 11 31
- >>DEC 3000/400S AXP 26.4 70.8
- >>DEC 10000/610 AXP 42.5 111.6
- >Convex C3810 (1 proc) 44 113
- >Cray C90 (1 proc) 387 874
-
- (NOTE: The performance above which is attributed to a CRAY-1 is
- actually that of a CRAY S-MP, NOT a CRAY-1. The CRAY S-MP is
- SPARC based system with scalar and with vector processors. There
- was also a product announcement last week from Cray Research
- Superservers, the former FPS, regarding a new vector CPU for the
- CRAY S-MP.)
-
- We must be careful when comparing new architectures with old
- architectures because of the effect of software. The CRAY-1 has two
- entries in the LINPACK benchmark report:
-
- System 100x100 dp 1000x1000 dp
- CRAY-1S cf77 2.1 27 Mflop/s 110 Mflop/s
- CRAY-1S CFT 1.12 12 110
-
- That CFT 1.12 results was generated in the early 80s (1983?) with cft
- 1.12. The cf77 2.1 result was generated in 1989. With current
- compilers from Cray Research, the 100x100 performance for the CRAY-1S
- would be approximately 35 or 40 Mflop/s. On this particular benchmark,
- we would see a 3x speed improvement attributable to software. (The
- 1000x1000 performance should not change with time because it usually
- generated with "hand-optimized" libraries.)
-
- The improvement of microprocessor speed of the past decade has been
- tremendous. How much of this improvement is attributable to software?
-
- Charles Grassl
- Cray Research, Inc.
- Eagan, Minnesota USA
-