mlucas on sun - Page 2

ewmayer · 2004-01-07, 15:24

Thanks for the timings, delta_t. Looks like RTP is giving from 0-15% speedup for the FFT lengths of current interest to GIMPS (roughly from 512-2048K).

I've PMed some e-mails from Bill Rea regarding his builds of a little over a year ago using a then-new version of the SunPro C compiler.

One other note re. the mlucas.cfg file entries: you should remove (at least from the working-directory version) any FFT lengths for which the best runtime is still worse than that for the next-higher FFT length. This typically happens for FFT lengths which involve a large-ish odd first-pass radix, which will be relatively inefficient compared to an even or power-of-two radix. For instance in your timings we see that 960K (which uses a radix-15 front-end DFT pass) is slightly slower than 1024K, which uses all power-of-two passes. Removing the 960 line from the file will cause the code to not use that length in production-test mode, but obviously you could srtill use it for manual timing tests.

Finally, since it looks like you're running on a multi-CPU system, it would be interesting to see how the timings are affected by memory bus contention when there are multiple instances of the program running.

sunosx · 2007-10-02, 22:13

I tried compiling the source archive suggested by ewmayer on my Sun Fire 4800 running Solaris 9. Even though the installation was a bit troublesome, but it runs smooth for now. Thanks

ewmayer · 2007-10-03, 21:36

Quote:

Originally Posted by sunosx

I tried compiling the source archive suggested by ewmayer on my Sun Fire 4800 running Solaris 9. Even though the installation was a bit troublesome, but it runs smooth for now. Thanks

Could you be a bit more specific about "troublesome"?

We are trying - in the little spare time our work-for-pay leaves us - to get a beta 3.0 release ready by year's end. Tom Duell of Sun has built the current in-dev codebase for this on various systems including some based on the new Sparc 6 chips, and gotten good performance on the latter. Currently working on specific optimizations targeting Solaris-on-AMD64 systems. We wish we could work full-time on this, but that luxury is presently not available to us.

rgiltrap · 2007-10-04, 05:45

Quote:

Originally Posted by ewmayer

We are trying - in the little spare time our work-for-pay leaves us - to get a beta 3.0 release ready by year's end.

The 3.0 beta gives pretty good levels of parallelization which should be nice on the SF4800.

2004-01-07, 15:24	#12
ewmayer ∂²ω=0 Sep 2002 República de California 103·113 Posts	Thanks for the timings, delta_t. Looks like RTP is giving from 0-15% speedup for the FFT lengths of current interest to GIMPS (roughly from 512-2048K). I've PMed some e-mails from Bill Rea regarding his builds of a little over a year ago using a then-new version of the SunPro C compiler. One other note re. the mlucas.cfg file entries: you should remove (at least from the working-directory version) any FFT lengths for which the best runtime is still worse than that for the next-higher FFT length. This typically happens for FFT lengths which involve a large-ish odd first-pass radix, which will be relatively inefficient compared to an even or power-of-two radix. For instance in your timings we see that 960K (which uses a radix-15 front-end DFT pass) is slightly slower than 1024K, which uses all power-of-two passes. Removing the 960 line from the file will cause the code to not use that length in production-test mode, but obviously you could srtill use it for manual timing tests. Finally, since it looks like you're running on a multi-CPU system, it would be interesting to see how the timings are affected by memory bus contention when there are multiple instances of the program running. Last fiddled with by ewmayer on 2004-01-07 at 15:25

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2007-10-02, 22:13	#13
sunosx Oct 2007 2₈ Posts	I tried compiling the source archive suggested by ewmayer on my Sun Fire 4800 running Solaris 9. Even though the installation was a bit troublesome, but it runs smooth for now. Thanks