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-   -   To James Heinrich (https://www.mersenneforum.org/showthread.php?t=12381)

Unregistered 2009-09-03 20:57

To James Heinrich
 
Any news on the CPU efficiency calculator ([url]http://mersenneforum.org/showthread.php?t=11784)?[/url]

Unregistered 2009-09-07 18:45

Perhaps I should have been more specific. To give some pointers:

1) The suggestion given in [url]http://mersenneforum.org/showpost.php?p=171067&postcount=8[/url] really interested me, but I haven't heard progress in that area. Can it be implemented?

2) While the FFT 'timings' do apply to L-L, P-1 and ECM testing, it really seems (at least to me) that the GHz-day credit differs significantly from one worktype to another. In other words, the "FFT credit" would mainly apply to L-L and only very roughly to the other worktypes. Is it possible to discriminate the credit between them?

3) Some benchmarks sent to mersenne-aries, which are the basis for the calculation, have statistically improbable differences from the rest (see [url]http://mersenne-aries.sili.net/bench.php?cpu=Intel%28R%29+Pentium%28R%29+4+CPU+2.40GHz&l2=&orderby=fft640[/url], for example), and are probably affecting the results. Perhaps you could remove the doubtful ones.

S485122 2009-09-08 19:38

[QUOTE=Unregistered;188931]Some benchmarks sent to mersenne-aries, which are the basis for the calculation, have statistically improbable differences from the rest (see [url]http://mersenne-aries.sili.net/bench.php?cpu=Intel%28R%29+Pentium%28R%29+4+CPU+2.40GHz&l2=&orderby=fft640[/url], for example), and are probably affecting the results. Perhaps you could remove the doubtful ones.[/QUOTE]Do not forget that for a same CPU at the same speed, memory speed plays a paramount role. This means that the benchmarks should be qualified by bus speed, memory multiplier, speed and latencies...

Jacob

cheesehead 2009-09-08 21:01

[quote=S485122;189060]Do not forget that for a same CPU at the same speed, memory speed plays a paramount role. This means that the benchmarks should be qualified by bus speed, memory multiplier, speed and latencies...[/quote]... plus comparison aids such as (FFT time)/(bus speed).


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