BOINC v6.6.25 released, fixes multiple GPU problem?

Author	Message
Beyond Send message Joined: 23 Nov 08 Posts: 1112 Credit: 6,162,416,256 RAC: 0 Level Scientific publications	Message 9122 - Posted: 29 Apr 2009, 19:55:08 UTC Last modified: 29 Apr 2009, 19:57:48 UTC Download: http://boinc.berkeley.edu/download_all.php Changelog: http://boinc.berkeley.edu/dev/forum_thread.php?id=2518&nowrap=true#24627 ID: 9122 · Rating: 0 · rate: / Reply Quote

Paul D. Buck Send message Joined: 9 Jun 08 Posts: 1050 Credit: 37,321,185 RAC: 0 Level Scientific publications	Message 9125 - Posted: 29 Apr 2009, 20:40:55 UTC YOu have to turn on the flag to use all GPUs if you have more than one, otherwise on a pair of GTX295 cards you will only get three. This bug has been traced to a use on the second GPU of 64K of memory by something else (meaning that the memory size reported for that GPU is always lower by 64K), a bug in the drivers? VIdeo buffer? Scratch Pad? who knows ... Anyway, there is no real fixes in 6.6.25 other than to patch the huge problem in 6.6.24 The debt accumulation bug from 6.6.x is still with us. ID: 9125 · Rating: 0 · rate: / Reply Quote

jrobbio Send message Joined: 13 Mar 09 Posts: 59 Credit: 324,366 RAC: 0 Level Scientific publications	Message 9126 - Posted: 29 Apr 2009, 20:44:38 UTC - in response to Message 9122. Should please a number of people with mixed GPU systems. There isn't much there for a single GPU user to move up to it from 6.6.24. Rob ID: 9126 · Rating: 0 · rate: / Reply Quote

Paul D. Buck Send message Joined: 9 Jun 08 Posts: 1050 Credit: 37,321,185 RAC: 0 Level Scientific publications	Message 9127 - Posted: 29 Apr 2009, 21:01:45 UTC - in response to Message 9126. Should please a number of people with mixed GPU systems. There isn't much there for a single GPU user to move up to it from 6.6.24. Rob Supposedly they added more debug statements (I have not seen them yet, though I have not been looking specifically for them either). I happen to be running it now because I am trying to get them to attend to the multitude of bugs in 6.6.x ... ID: 9127 · Rating: 0 · rate: / Reply Quote

MarkJ Volunteer moderator Volunteer tester Send message Joined: 24 Dec 08 Posts: 738 Credit: 200,909,904 RAC: 0 Level Scientific publications	Message 9230 - Posted: 3 May 2009, 0:50:41 UTC - in response to Message 9125. Last modified: 3 May 2009, 0:51:38 UTC YOu have to turn on the flag to use all GPUs if you have more than one, otherwise on a pair of GTX295 cards you will only get three. This bug has been traced to a use on the second GPU of 64K of memory by something else (meaning that the memory size reported for that GPU is always lower by 64K), a bug in the drivers? VIdeo buffer? Scratch Pad? who knows ... From a GPUgrid wu done yesterday: # Using CUDA device 1 # Device 0: "GeForce GTX 260" # Clock rate: 1242000 kilohertz # Total amount of global memory: 939196416 bytes # Number of multiprocessors: 27 # Number of cores: 216 # Device 1: "GeForce GTX 260" # Clock rate: 1242000 kilohertz # Total amount of global memory: 939261952 bytes # Number of multiprocessors: 27 # Number of cores: 216 Certainly seems like 64k less on the 1st device. As you say may be an issue with the device driver. There have been reports of this under 181.22. In my case I am running 182.50 drivers. BOINC blog ID: 9230 · Rating: 0 · rate: / Reply Quote

Spear Send message Joined: 28 Jan 09 Posts: 19 Credit: 15,297,622 RAC: 0 Level Scientific publications	Message 9232 - Posted: 3 May 2009, 3:18:10 UTC - in response to Message 9230. Drivers 185.81 don't show the missing 64k. Here's an example WU done with them. http://www.gpugrid.net/result.php?resultid=611732 ID: 9232 · Rating: 0 · rate: / Reply Quote