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- From: spxpmf@thor.cf.ac.uk (Phillip Fayers)
- Newsgroups: comp.sys.sun.hardware
- Subject: Re: Performance of Sparc Classic?
- Message-ID: <20115.9301261345@thor.cf.ac.uk>
- Date: 26 Jan 93 13:45:01 GMT
- References: <51917@seismo.CSS.GOV> <18471@autodesk.COM>
- Sender: news@cm.cf.ac.uk (Network News System)
- Organization: Physics Dept. University of Wales, Cardiff
- Lines: 41
- X-Mailer: Cardiff Computing Maths PP Mail Open News Gateway
-
- In article <18471@autodesk.COM> marc@autodesk.com writes:
- |
- |In article 51917@seismo.CSS.GOV, dsc@seismo.CSS.GOV (taste is the enemy
- |of art) writes:
- |
- |>Model SPECint92 SPECfp92 MIPS MFLOPS Cache* Contexts
- |>----- --------- -------- ---- ------ ------ --------
- |>IPX 21.8 21.5 28.5 4.2 64 8
- |>2 21.8 22.8 28.5 4.2 64 16
- |>Classic 26.4 21.0 59.1 4.6 6 64
- |>LX 26.4 21.0 59.1 4.6 6 64
- |>
- |>* in KBs - cache is unified unless marked as data/instruction.
- |
- |Take careful note of the cache size on the Classic/LX. One thing that
- |has been become obvious to us here is that the IPX and SS2 perform
- |significantly better (in some case 2 or 3 times) on large programs with
- |poor cache locality. Benchmarks don't always tell the whole story...
-
- One other thing to note is that the Classic and LX have a faster path to
- main memory than the SPARCstation 2 so they should be able to live with a
- smaller cache. The Classic/LX use 60ns SIMMs and pull 64bits at a time
- from two 32bit SIMMs which means that it accesses memory more than twice
- as fast as an SS2 (80ns 32bit). From a talk at the UK Unix User Group/ Sun
- UK User Group New Year conference (1993) I found out that the SPARCstation 2
- takes 25 clock cycles to fetch from main memory when it has a chache
- miss! The Classic with its Tsunami chipset (a much nicer name than MicroSPARC
- IMHO) doesn't have such a large miss penalty.
-
- Looking at the figures above I would say that the SPECfp92 benchmarks
- are unlikely to fit in a 6kbyte cache so comparing the SS2 and Classic
- by the SPECfp92 numbers should give you quite a good comparison.
-
- --
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