Strange WinNT Performance Issue
Dwight Hughes
dwighth at ipa.net
Fri Sep 24 21:09:47 UTC 1999
I was seeing this "quantization" effect earlier when I was running the
benchmarks -- I would see values of 16,666,666 pop up occasionally on a
PII/300 or 25,000,000 on a PII/400. I increased the values in
#tinyBenchmarks to get stable realistic answers. In update 1437 to 2.5
Andreas Raab changed #tinyBenchmark so it automatically compensates by
increasing the values enough to make the benchmarks run for at least 1
second each on any machine. Try getting the last set of 2.5 updates from
the server and see what the benchmarks say.
-- Dwight
Dean_Swan at Mitel.COM wrote:
>
> Andreas,
>
> I just tried an intersting benchmark experiment. On my PII/450 at work,
> running WinNT/SP4, Squeak 2.5 (through 1432), 2.5 VM (build 6):
>
> case 1)
> Open applications under NT - Psion EPOC32 R5 Emulator,
> Win 3.1 Terminal Program,
> Premia CodeWrite 5.1b,
> Internet Explorer 4.01
>
> 0 tinyBenchmarks. 25000000 bytecodes/s, 1208527 sends/s
>
> case 2)
> Open applications under NT - Win 3.1 Terminal Program,
> Premia CodeWrite 5.1b,
> Internet Explorer 4.01
>
> 0 tinyBenchmarks. 16666666 bytecodes/s, 1208527 sends/s
>
> I'm not entirely sure what this means, other than that the PII/450 is capable of
> performing at the same level as a G3/333 iMac. The odd thing is that having the
> Psion emulator running seems to make Squeak run faster!
>
> I don't know if this suggests any VM issues or not, but I thought I'd share the
> raw data point anyway.
>
> -Dean Swan
> dean_swan at mitel.com
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