Questions and Answers :
GPU applications :
Returning to Seti, but CUDA is really slow?
Message board moderation
Author | Message |
---|---|
GammelMan Send message Joined: 24 Jun 07 Posts: 3 Credit: 811,161 RAC: 0 |
Hello all, I'm sort of returning to Seti after running Foldign@Home for a while on GPU. When I run on my hardware which is 26/08/2009 19:38:50 CUDA device: GeForce 8800 GT (driver version 19038, compute capability 1.1, 512MB, est. 60GFLOPS) it seems to be really slow. After two hours I have completed about 25% of a workunit. Is this about right or is there something wrong with my setup perhaps? I have GPU enabled when computer is in use, and turned off CPU work. I've tried looking in the forums, but not found any clues. Thanks in advance for any pointers. |
Fred W Send message Joined: 13 Jun 99 Posts: 2524 Credit: 11,954,210 RAC: 0 |
Hello all, Could you just double-check the figures, please? 60GFlops seems remarkably high for an 8800GT. F. |
GammelMan Send message Joined: 24 Jun 07 Posts: 3 Credit: 811,161 RAC: 0 |
Hello all, Well, this is a more complete snippet from the message log that describes my HW setup: ----- 26/08/2009 22:28:39 Processor: 2 AuthenticAMD AMD Athlon(tm) 64 X2 Dual Core Processor 4200+ [x86 Family 15 Model 43 Stepping 1] 26/08/2009 22:28:39 Processor features: fpu tsc pae nx sse sse2 3dnow mmx 26/08/2009 22:28:39 OS: Microsoft Windows XP: Home x86 Edition, Service Pack 2, (05.01.2600.00) 26/08/2009 22:28:39 Memory: 2.00 GB physical, 1.85 GB virtual 26/08/2009 22:28:39 Disk: 232.88 GB total, 14.42 GB free 26/08/2009 22:28:39 Local time is UTC +2 hours 26/08/2009 22:28:39 CUDA device: GeForce 8800 GT (driver version 19038, compute capability 1.1, 512MB, est. 60GFLOPS) ----- When running a WU, the status line says "0.14 CPUs, 1 CUDA" if that's any help. |
Gundolf Jahn Send message Joined: 19 Sep 00 Posts: 3184 Credit: 446,358 RAC: 0 |
...it seems to be really slow... Check the stderr.txt file in the slot directory for "true angle range." Very Low Angle Range (VLAR) tasks tend to run very slow on CUDA. I'm not quite sure, but I think values around 0.01 are very low. Gruß, Gundolf PS: just found this message on Number crunching: Yes, vlar (Very Low Angle Range <= 0.05) WUs can end with Exit status -177 (0xffffffffffffff4f), noted later with the message "Maximum elapsed time exceeded". Each WU has a computation limit, and for the speed of your GTX 295 GPUs that will work out to be 4h11'.So, my estimate was a little low. Computer sind nicht alles im Leben. (Kleiner Scherz) SETI@home classic workunits 3,758 SETI@home classic CPU time 66,520 hours |
Fred W Send message Joined: 13 Jun 99 Posts: 2524 Credit: 11,954,210 RAC: 0 |
Well, this is a more complete snippet from the message log that describes my HW setup: Well, that's me told :) I apologise for doubting your figures; I don't run an 8800GT myself and was extrapolating from other 88xx / 9xxx figures that I had read here on the boards. Hopefully you will get a more enlightened response from someone who also runs the same type of card. The "0.14 CPUs, 1 CUDA" is quite normal; that just means that just 14% of a CPU has been specified to feed the GPU so the other 86% can be used for other purposes (other activies or crunching a CPU WU as you prefer). F. |
GammelMan Send message Joined: 24 Jun 07 Posts: 3 Credit: 811,161 RAC: 0 |
...it seems to be really slow... Looking in the stderr file, I see "WU true angle range is : 0.008326" In that case, maybe the 3+ hours per WU I get is to be expected? |
Fred W Send message Joined: 13 Jun 99 Posts: 2524 Credit: 11,954,210 RAC: 0 |
Looking in the stderr file, I see "WU true angle range is : 0.008326" That's your answer. One up to Gundolf :). That VLAR would take about 70 mins on my GTX295 where a "normal" WU takes between 5 and 50 mins (most are around 10 mins) according to Angle Range. F. |
BilBg Send message Joined: 27 May 07 Posts: 3720 Credit: 9,385,827 RAC: 0 |
If you don't want to compute this kind of long-time VLAR WUs you can use Optimized Apps - Lunatics' Unified Installer: http://setiathome.berkeley.edu/forum_thread.php?id=54288&nowrap=true#927649 (They will be automatically rejected (killed)) Â - ALF - "Find out what you don't do well ..... then don't do it!" :) Â |
Gundolf Jahn Send message Joined: 19 Sep 00 Posts: 3184 Credit: 446,358 RAC: 0 |
Or, better yet, try the rescheduling tool. See this thread. |
Chuck Gorish Send message Joined: 19 Jun 00 Posts: 156 Credit: 29,589,106 RAC: 0 |
Or, better yet, try the rescheduling tool. See this thread. yes. i'm using the linux perl script version of this and it is really good. my vlar killer application no longer gets to see any vlar or vhar units so everything gets processed optimally. |
©2024 University of California
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.