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Number crunching :
Very Strange Time To Competion
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Send message Joined: 26 Jul 08 Posts: 627 Credit: 94,940,203 RAC: 0 |
I'm noticing some really long wu's on my older machines but not many. I posted the details of one here: Travis, have you read my post in the other "unusual time to completion" thread? I've tested it. The problem is not that alpha==delta==1 condition. It is really the underflow condition at the stream parameter bounds for the particle swarm searches. |
Send message Joined: 30 Aug 07 Posts: 2046 Credit: 26,480 RAC: 0 |
I'm noticing some really long wu's on my older machines but not many. I posted the details of one here: It seems like people are having some other problem though. The one you were talking about was a much smaller increase in runtime. |
Send message Joined: 22 Feb 08 Posts: 260 Credit: 57,387,048 RAC: 0 |
Do those evercrunch WUs only jump on Windows machines? mic. |
Send message Joined: 26 Jul 08 Posts: 627 Credit: 94,940,203 RAC: 0 |
Do those evercrunch WUs only jump on Windows machines? As it is most likely a problem specific to thoses machines, one can't say that. I've never experienced such a WU on my computers (all running Windows). The somewhat smaller runtime deviations related to the underflows at the bounds of some stream parameters are visisble on all types of machines and also with the stock application. |
Send message Joined: 22 Feb 08 Posts: 260 Credit: 57,387,048 RAC: 0 |
Do those evercrunch WUs only jump on Windows machines? I was just wondering, cause I haven't seen any on my machines... mic. |
Send message Joined: 9 Aug 08 Posts: 18 Credit: 56,863,533 RAC: 0 |
Several additional interesting observations. 1) Variations in WU run times (by stripe) are greatest on my Intel-based machines. The AMD-based machines are all within a couple percentages points of completion time; the Windows based machines (Q6600 Vista 32, P4 XP Pro) can sometimes vary by more than two to three-fold. 2) Problems have been most pronounced with the opti-apps; last two versions I have run were Gispel's. When I detached from the project, and re-attached, and ran a couple dozen off the stock app, the run times (by stripe) again were within a couple percentage points of each other (Q6600). 3) Later, re-loaded v0.19 opti app (Gispel), fresh download, and again, variations between run times went way up again (Q6600). 4) Further, time to read the parameter files on the stock app were <1 second, however, back under the opti app, they varied wildly - sometimes to over 90 seconds, which is ridiculous (Q6600). Again, these are merely observations, and in no way should be considered judgements. We all know that the unique combination of HW + OS + SW can often give different results for some. In other words, your mileage may vary. Perhaps due to the continuing frustration of all of the above, I decided to give the GPU app a try. Still have a couple of kinks to work out, but judging by the stability and consistency (and, to be honest, speed of credit!), I'm gonna put my frustrations aside, and stay with the GPU app instead. Now, if only we could get a CUDA version so I can run it on three of my other boxes! Rgds XB |
Send message Joined: 26 Jul 08 Posts: 627 Credit: 94,940,203 RAC: 0 |
Perhaps due to the continuing frustration of all of the above, I decided to give the GPU app a try. Still have a couple of kinks to work out, but judging by the stability and consistency (and, to be honest, speed of credit!), I'm gonna put my frustrations aside, and stay with the GPU app instead. Ater some errors in the beginning, it appears to be running quite well now on your Q6600 and the HD38?0, isn't it? |
Send message Joined: 9 Aug 08 Posts: 18 Credit: 56,863,533 RAC: 0 |
That it is, CP, that it is. :) XB |
Send message Joined: 12 Apr 08 Posts: 621 Credit: 161,934,067 RAC: 0 |
Perhaps due to the continuing frustration of all of the above, I decided to give the GPU app a try. Still have a couple of kinks to work out, but judging by the stability and consistency (and, to be honest, speed of credit!), I'm gonna put my frustrations aside, and stay with the GPU app instead. Well, Dual Xeon and HD4870 after 22 hours seems to be running Ok ... still have not figured out how to keep it running one task at all times. I get some pauses at times... Color me reasonably happy for the moment ... Has anyone tried the last version of BOINC out to see if it picks up the ATI cards? I sent them the notes on GPU detection but have not seen any feedback on it ... |
Send message Joined: 6 Apr 08 Posts: 2018 Credit: 100,142,856 RAC: 0 |
Has anyone tried the last version of BOINC out to see if it picks up the ATI cards? I sent them the notes on GPU detection but have not seen any feedback on it ... Yes I have and I don't think so. I installed BOINC 6.4.5 after installing a HD4850 ATI card today;
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