Re: Mersenne: Prime95 - V21.1.1 aka v21a
Hi all, some timings for the interrested. standard menu default 10m 10 iterations timing. TB 800 at 6.5*133=866 v20 : 0.114 v21 prefetch=0 : 0.120 v21 prefetch=1 : 0.092 George de Fockert _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Prime95 - V21.1.1 aka v21a
Tried the new V21 Linux version (p95v21x.zip). My original (35 um) Athlon got the same percentage speed increases that others have been reporting (did *not* have to explicity put in CpuSupportsPrefetch=1). One minor V21 difference: I was using the "Advanced/Time" option, and V20 would show each 'timing' line as it completed. But V21 did not change the screen appearance (after "Accept above answers?") until the whole multi-iteration 'timing' run was complete -- then it showed ALL the 'timing' lines at once, immediately followed by the elapsed time of the whole 'timig' run, plus the estimate of the time it would take to perform an LL test of the specified exponent. mikus _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Prime95 - V21.1.1 aka v21a
On Tue, 19 Jun 2001, Brian J. Beesley wrote: [...] > Unfortunately I can't contribute timings to this argument as none of > my three Athlon systems can run Prime95 (they're all linux systems). Prime95 is available on Linux. It's called mprime and you can download it from: ftp://mersenne.org/gimps/mprime.tar.gz (glibc 2.1.3) ftp://mersenne.org/gimps/sprime.tar.gz (static) I even maintain a Debian package for it called prime-net. You will find it in the non-free/misc section. Of course, for version V21.1.1, I believe you're right. > Must dig out wine & see if Prime95 will run over wine/X/linux, though > that's a mightly roundabout way of running what's essentially a > console program!!! [...] I tried this but it does not work well. I could start prime95 once using 'wine --managed ./PRIME95.EXE' but couldn't start it again after that. -- Francois Gouget [EMAIL PROTECTED]http://fgouget.free.fr/ The greatest programming project of all took six days; on the seventh day the programmer rested. We've been trying to debug the *&^%$#@ thing ever since. Resume: design before you implement. _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Prime95 - V21.1.1 aka v21a
George Woltman wrote: >Some Athlons are seeing a speed increase others are not. The >two that I know are not enjoying a speed increase are running >under Win2K. Maybe there is a bug in the way v21.1 determines >if prefetch is supported. > >For those Athlon owners that are not seeing a speed boost, try setting > CpuSupportsPrefetch=1 >in local.ini This is a possibility. The other possibility is that there might be something in Windows that is interfering. The reason I say this, is that I have a P3 running at 733Mhz, and after a reboot, Prime95 was back to running at the same iteration time before v21 starting running. After stopping Prime95 and adding the line to local.ini, it was back to the increased speed. Interesting... to say the least... Eric P.S. BTW, this P3 is running Win98SE... _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Prime95 - V21.1.1 aka v21a
- Original Message - From: "Brian J. Beesley" <[EMAIL PROTECTED]> > It would also be interesting to find out if the PIII prefetch code > benefits the AMD K6 processor. The K6-2 and K6-3 do have an Athlon- > compatible prefetch instruction, though it's using 32-byte cache > lines and there is no prefetch queue i.e. only one prefetch can be > active at any time. Just tried it on my k6-2, needs CpuSupportsPrefetch=1 in local.ini, and results in an illegal instruction exception. So the program probably does not use the AMD 3dnow! prefetch instruction, PREFETCH(W), but one of the intel MMX2 or SIMD prefetch instructions not on the K6-2, PREFETCHNTA orPREFETCHT[123] > BTW what happens to the prefetch instructions for those processors > (like PII) that don't support prefetch? See above for the K6-2 George de Fockert _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Prime95 - V21.1.1 aka v21a
My 1 GHz Thunderbird in Win98 SE showed speed improvements without putting anything in the .ini file. I used the Advanced->Time option and noted the following two anomalies: 1) At 512 KB and only 512 KB, the program returned the following along with my timings: timer 0: 1100364 timer 1: 4152504 timer 2: 3305631 ... and so on for timer #'s 0, 1, 2, 3, 4, 5, 6, 7, 10, 11, 20, 21, 22, 23, 30 When I rerun the test, the numbers appearing after "timer #:" are different, but the exact same timer #'s are outputted. 2) FFT sizev20 v21a 192 KB 0.037 0.030 224 KB 0.044 0.038 256 KB 0.048 0.039 224 KB seems to have a disproportionately small amount of improvement. I timed around 200 iterations on 224 KB to verify that 0.038 is the fastest time it could get. Nick Glover: [EMAIL PROTECTED] Computer Science, Clemson University Homepage: http://hubcap.clemson.edu/~nglover/ "It's good to be open-minded, but not so open that your brains fall out." - Jacob Needleman _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
RE: Mersenne: Prime95 - V21.1.1 aka v21a
> Some Athlons are seeing a speed increase others are not. The two > that I know are not enjoying a speed increase are running under Win2K. > Maybe there is a bug in the way v21.1 determines if prefetch > is supported. > > For those Athlon owners that are not seeing a speed boost, try setting > CpuSupportsPrefetch=1 > in local.ini. This sure worked for me. Athlon 850MHz Testing M12328xxx Iteration Times V.20V.21V.21 with CpuSupportsPrefetch=1 added to local.ini 0.174 0.174 0.141 Athlon 1200MHz Testing M12899xxx Iteration Times V.20V.21V.21 with CpuSupportsPrefetch=1 added to local.ini 0.151 0.151 0.123 Both computers running Windows 2000 Server. Note that stopping Prime95 (leaving Prime in systray) then editing local.ini, then starting Prime wasn't good enough. I had to actually close the program, then restart Prime95. Matt _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Prime95 - V21.1.1 aka v21a
Hi, At 01:43 AM 6/19/2001 +0100, Michael Bell wrote: > > I am not getting any performance increase on my 2 Athlon's here, and I am > > 99% sure they are Thunderbirds. Some Athlons are seeing a speed increase others are not. The two that I know are not enjoying a speed increase are running under Win2K. Maybe there is a bug in the way v21.1 determines if prefetch is supported. For those Athlon owners that are not seeing a speed boost, try setting CpuSupportsPrefetch=1 in local.ini. Good luck, George _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Prime95 - V21.1.1 aka v21a
One more possibility to keep in mind for Athlons: BIOS level (and perhaps also which motherboard). Don't have windows, so can't try the optimized prime95, but have noticed on "timing runs" with the V20 mprime that my new (ASUS A7M266) Athlon is now 2% slower than when I first got it. The only explanation I can come up with is that hardware setup by the BIOS is responsible for this difference. (Nothing in my system has changed since I started, except that I upgraded to the latest BIOS -- and I typed in the exact same BIOS parameters as I did originally.) Perhaps the newer BIOS software has changed in some manner that would explain the timing difference I saw. mikus _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Prime95 - V21.1.1 aka v21a
> H, > I am not getting any performance increase on my 2 Athlon's here, and I am > 99% sure they are Thunderbirds. It appears I was wrong, the prefetch is available on all Athlons not just Thunderbirds, so it must be something else. Michael. _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
RE: Mersenne: Prime95 - V21.1.1 aka v21a
H, I am not getting any performance increase on my 2 Athlon's here, and I am 99% sure they are Thunderbirds. I just tried this new executable on 7 machines. Here are the numbers. PentiumIII 450MHz Testing M12441xxx Iteration Times V.20V.21 0.330 0.255 PentiumII 233MHz Double Checking M6144xxx Iteration Times V.20V.21 0.298 0.292 PentiumII 350MHz Testing M12316xxx Iteration Times V.20V.21 0.416 0.423 Athlon 850MHz Testing M12328xxx Iteration Times V.20V.21 0.174 0.174 Athlon 1200MHz Testing M12899xxx Iteration Times V.20V.21 0.151 0.151 According to Windows 2000 these 2 Athlon's are "Family 6, Model 4, Stepping 2" Pentium 166MHz Double Checking M6333xxx Iteration Times V.20V.21 0.601 0.607 Pentium 133MHz Double Checking M6333xxx Iteration Times V.20V.21 0.697 0.692 What I find interesting, is that I got an increase, albiet a very minor one, instead of a decrease in performance on the PentiumII 233 and the P133, yet my PentiumII 350 and P166 did decrease in performance, like everyone else is reporting. I wonder if the operating system has anything to do with this. The PII 233 and the P133 are running Windows 2000 Professional and the PII 350 and the P166 are running Windows 98 and 95 respectively. Matt -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Michael Bell Sent: Monday, June 18, 2001 5:06 AM To: Mersenne List Subject: Re: Mersenne: Prime95 - V21.1.1 aka v21a > Note also that the Athlon *did* have a performance increase > on par with the Celeron 2 and P3 machines > > Eric Is it possible that the Athlon that didn't see the increase was an original Athlon (rather than a T'bird) and so didn't have the prefetch instructions? Michael. _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Prime95 - V21.1.1 aka v21a
> Note also that the Athlon *did* have a performance increase > on par with the Celeron 2 and P3 machines > > Eric Is it possible that the Athlon that didn't see the increase was an original Athlon (rather than a T'bird) and so didn't have the prefetch instructions? Michael. _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Mersenne: Prime95 - V21.1.1 aka v21a
Hi All, I downloaded and ran the new v21a and did some timings on several different machines and compared them to timings done on v19 and v20... I ran the timings on each version for 100 screen outputs at 100 iterations per screen output... for a total of 1 iterations... and then averaged the iteration times... I used the same exponent on all versions and machines... (an exponent I am primality testing that is just shy of 11,400,000) What I can up with was these results... V19V20V21 - - - PII at 266Mhz 0.579 0.578 0.586 Celeron 1 at 466Mhz 0.605 0.604 0.615 Celeron 2 at 550Mhz 0.289 0.288 0.223 P3 at 733Mhz 0.239 0.238 0.188 Athlon at 1333Mhz 0.100 0.098 0.077 Admittedly, while the 466Mhz Celeron 1 has almost double what the iteration time was expected to be... (for some yet unknown reason -- Prime95 is getting 98.9% of the CPU time)... the % increase/decrease is still evident Note also that the Athlon *did* have a performance increase on par with the Celeron 2 and P3 machines Eric _ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
