Re: Mersenne: AMD Athlon problems
On Mon, 7 Feb 2000, Conor McCutcheon wrote: I have a new athlon 750 running either prime95 or mprime 24 hours a day, but I am getting a ridiculously slow per iteration time for a 9.5 million range exponent (1.192 sec avg). I have installed on prime95 on over 20 machines now, including an Is this measured, or the number reported on the screen? Athlon 550 (it gets about .2 something seconds on a 9.4 million range exponent), and experience tells me this is ridiculous. CPU failure can be ruled out, linux dmesg agrees with the bios and box it came in anyway. Does anyone have any thoughts on why it is running so slowly? I looked at the list archives for someone mentioning such an incident, but did not find anything that helped. Thank you in advance for your help. Note that the time taken is dependent on a correctly set CPUSpeed since the code don't time anything, but counts clock cycles and converts using the value you gave. Your low speed reported is consistent with a mistype of 75 for the speed instead of 750. -Conor McCutcheon _ Unsubscribe list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers -- Henrik Olsen, Dawn Solutions I/S URL=http://www.iaeste.dk/~henrik/ Flinx: Everybody wants to kidnap me. Oh well, I'll travel the galaxy and have boring adventures. (Pip the Flying Snake spits at something and kills it.) The Flinx of the Commonwealth Series, Book-A-Minute version _ Unsubscribe list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: AMD Athlon problems
Well, I wish it was as simple as power management, but turning that off in the bios and windows is the very first thing I did after installing the CPU. As for the CPU overheating, I really doubt it, but it is worth looking into. I have what appears to be a good fan attached to the CPU, one designed to be used the way I am using, with the heat transfer goop on it as well, and I have an additional case fan that brings in cool air from the room. All appear to be working. As for the suggestion that the CPU speed is incorrectly set, it is not. I have checked that setting and played with it enough to be sure that it is correct. It is also worth noting that the number of cycles each iteration takes matches extremely well with the time reading if and only if my CPU is set to 750 in the preferences. At this point I think it might be something with my memory, because that could explain the CPU running at full speed but not mprime or prime95. Does this seem like a reasonable explanation (I have 128M of PC100 sdram in one dimm)? The Athlon 550 I mentioned only had PC133 (or was it 166), but I can't imagine that making a 550 outperform a 750 by nearly 10 times. Anyway, thank you again for your help. -Conor - Original Message - From: "Brian J. Beesley" [EMAIL PROTECTED] To: "Conor McCutcheon" [EMAIL PROTECTED] Sent: Tuesday, February 08, 2000 11:18 AM Subject: Re: Mersenne: AMD Athlon problems On 7 Feb 00, at 23:25, Conor McCutcheon wrote: I have a new athlon 750 running either prime95 or mprime 24 hours a day, but I am getting a ridiculously slow per iteration time for a 9.5 million range exponent (1.192 sec avg). Try turning off the power management, it's possible that the system is running in "slow" mode due to apparent non-activity of keyboard etc. The M/B should have temp sensors for the CPU. If you can't read these whilst Prime95/mprime is running (usually the M/B supplier does include a disk with a Windoze monitor program) you should be able to read the CPU temp from the BIOS. If the CPU gets too warm then it will probably drop its speed. I believe Athlons do require a special cooling fan PSU, if the system was supplied with substandard components then it could quite easily be overheating. Regards Brian Beesley _ Unsubscribe list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
RE: Mersenne: AMD Athlon problems
-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Conor McCutcheon I have a new athlon 750 running either prime95 or mprime 24 hours a day, but I am getting a ridiculously slow per iteration time for a 9.5 million range exponent (1.192 sec avg). I have installed on prime95 on over 20 machines now, including an Athlon 550 (it gets about .2 something seconds on a 9.4 million range exponent), and experience tells me this is ridiculous. Have you tried running one of the programs which verify that your L2 cache is actually functioning (despite what the settings in the BIOS may claim)? http://www.softseek.com/Utilities/Benchmarking_and_Tune_Up/Review_6_inde x.html is one. I remember hearing that the Athlon 750 had issues with L2 cache at least for a while. I think they run it at ~40% of the core clock rather than 1/2 as with the slower Athlons. That alone obviously doesn't explain your results but maybe if the cache is not functioning at all for some reason... ? -Ethan O'Connor [EMAIL PROTECTED] _ Unsubscribe list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
