Message boards :
Number crunching :
GPU usage oscillation
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Author | Message |
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Sean Arrowsmith Send message Joined: 17 Feb 01 Posts: 34 Credit: 4,955,471 RAC: 0 |
Hello, I have been try to work out what is happening on one of my PC's http://setiathome.berkeley.edu/show_host_detail.php?hostid=7068185 The system is AMD X645 with 8Gb memory and GTX460 (1Gb) I have just wiped the HD and reinstalled Win7, followed by Nvidia drivers 320.49 I put BOINC V7.0.64 (64bit) on and reattached to BAM which downloaded downloaded SETI and Engima. I then installed Lunatics 0.41 64bit installer. Upon running MSI Afterburner I can see the GPU usage going up and down. ie the usage oscillation at 99% for 7 seconds then drops to 30% for one seconds and then back up to 99% and so on it goes up and down. None of my other Nvidia PC's do this, is there a reason or a setting for this oscillation The GTX460 only is set up to crunch SETI MB Cuda WU Thank you |
Mike Send message Joined: 17 Feb 01 Posts: 34253 Credit: 79,922,639 RAC: 80 |
You probably need to free a CPU core on that host to feed the GPU properly. With each crime and every kindness we birth our future. |
Richard Haselgrove Send message Joined: 4 Jul 99 Posts: 14649 Credit: 200,643,578 RAC: 874 |
You probably need to free a CPU core on that host to feed the GPU properly. Maybe he already tried to free a core, but by mistake used the wrong %age box? If you set the "Use at most ... %CPU time" control, it will run as described - all CPUs for 7 seconds on, 1 second off at 87.5% Instead, set that value to 100%, and use the alternative "use at most ... % of the processors" - at 87.5%, that will keep 3 CPUs continuously occupied (on his quad core), and leave one free. Not that it should be necessary, since he's running Cuda, not OpenCL. Edit - there was a range of BOINC clients - v7.0.45 thru v7.2.0 - where David (inadvisedly IMHO) made CPU time throttling apply to GPU apps too. Unfortunately, this includes the currently-recommended v7.0.64 which Sean is using. |
jason_gee Send message Joined: 24 Nov 06 Posts: 7489 Credit: 91,093,184 RAC: 0 |
...The GTX460 only is set up to crunch SETI MB Cuda WU Under those circumstances, I'd recommend lifting the application defaults in mbcuda.cfg, for a 460 more or less dedicated running Cuda MB, around: [mbcuda] processpriority = abovenormal pfblockspersm = 4 pfperiodsperlaunch = 200 Also, perhaps check there aren't any crazy unnecessary motherboard utilities, or other background processes you don't want/need, running. Not that erratic usage is a problem, if expected due to using the PC, but annoying if youthink the system is clean & there is other stuff stealing the Bus (Been there ;) ). "Living by the wisdom of computer science doesn't sound so bad after all. And unlike most advice, it's backed up by proofs." -- Algorithms to live by: The computer science of human decisions. |
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