mersenneforum.org  

Go Back   mersenneforum.org > Great Internet Mersenne Prime Search > Software

Reply
 
Thread Tools
Old 2016-01-17, 05:02   #1
airsquirrels
 
airsquirrels's Avatar
 
"David"
Jul 2015
Ohio

11·47 Posts
Default Prime95 lock-ups on AMD under Linux

I'm having some trouble with prime95 when running under Debian 8 (Jessie) linux. All of my Intel machines can run all day long without issues, however every single AMD machine I have will deadlock after 24-48 hours if prime95 is running.

This has happened on a Phenom II X6 chip, as well as FX8350, 8320, and 9370 chips. Different motherboards, different RAM brands.

The only other piece of information I have is that multiple GPUs are installed in each of these systems. If I only run mfakto / mfaktc / cudaLucas I never get the lockups. It is only when running prime95. Admittedly AMD prime95 performance isn't amazing anyway so it hasn't been a priority, but I recently built several more AMD GPU hosts and I would love to keep those cores busy at least with DC work.

Has anyone else experienced this problem?
airsquirrels is offline   Reply With Quote
Old 2016-01-17, 06:46   #2
Dubslow
Basketry That Evening!
 
Dubslow's Avatar
 
"Bunslow the Bold"
Jun 2011
40<A<43 -89<O<-88

1C3516 Posts
Default

Could you be more specific about what's causing the lockups? In place tests? Large FFTs? All of the above?

Can you boot one of the problem machines to Windows or BSD to eliminate the OS variable?

Last fiddled with by Dubslow on 2016-01-17 at 06:46
Dubslow is offline   Reply With Quote
Old 2016-01-17, 06:46   #3
Mark Rose
 
Mark Rose's Avatar
 
"/X\(‘-‘)/X\"
Jan 2013

55618 Posts
Default

It sounds like the common factor here is the AMD driver.

Does it still happen if you don't use all the cores?
Mark Rose is offline   Reply With Quote
Old 2016-01-17, 14:38   #4
airsquirrels
 
airsquirrels's Avatar
 
"David"
Jul 2015
Ohio

11·47 Posts
Default

I'll gather more information, this is using the latest mprime running double checks usually (too slow for LL). Currently happening with six of the 40,250,XXX range exponents. AMD K10 FFT 2240K FFT.

It happens on both systems with the AMD GPUs/driver installed and systems with the NVIDIA driver installed, so it's not specific to any GPU or driver.

I can try booting my windows live disk, I've also noted that once with a monitor connected that the kernel spit out a message about a CPU deadlock which I can not precisely recall. These machines are usually headless, but I will connect a monitor to one to see if I can reproduce.

I am configured for the full 6/8 workers, however I know AMD cores aren't exactly 1-1 with Intel cores, so I'm not sure if this is the best configuration.

Temps are not an issue, especially right now as one machine is essentially sitting 30* F in a window.

I can try using less cores, if memory serves it still occurred just less often. This hasn't been a very high priority because it is difficult to investigate, that's why I thought I would check if anyone else had experienced it before sinking too much time into experimentation.

Last fiddled with by airsquirrels on 2016-01-17 at 14:40
airsquirrels is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Prime95 for PPC Linux frolyar Software 4 2015-07-27 14:10
Prime95 on Puppy Linux? Rodrigo Software 17 2011-01-30 16:55
Prime95 (32-bit) on 64-bit Linux OK? fes016 Software 1 2007-10-29 01:50
Torture Lock SWR_DMaster Software 5 2006-04-06 21:55
prime95 linux stealthaxe Software 1 2003-05-16 17:55

All times are UTC. The time now is 13:13.

Mon Mar 8 13:13:27 UTC 2021 up 95 days, 9:24, 0 users, load averages: 2.40, 2.39, 2.41

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.