100 fold increased in work unit run time


Message boards : Number crunching : 100 fold increased in work unit run time

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George Hinderliter

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Joined: 31 Jan 14
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Message 5009 - Posted: 3 Oct 2016, 9:37:41 UTC
Today, I installed Boinc on a windows 7 pro system with I7 3770. First 80 work units average around 2 to 3 mins to complete. Then without changing anything the run times for the work units have increased to right at 3hours to run. I look at cpu usage and all 8 threads are going at 100% use and can't seem to figure out why.
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-Alex-

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Message 5010 - Posted: 3 Oct 2016, 15:09:30 UTC - in response to Message 5009.  
Well, my i7-4790k will typically run a task at maybe 1,5h to 2h, so the longer run time mentioned seem very reasonable. Sometimes I and others get these superfast ones, but they are not the typical ones that you should expect. I didn't see one for weeks after joining. You were "lucky" from a credit point of view, however I have no idea whether these tasks have any scientific value.

Then there are small differences in speed depending on whether you are running standard, SSE or AVX tasks. The client will choose the fastest version after testing the supported alternatives. Your computer is choosing AVX now (normally the fastest but generates more heat), however one of the first tasks assigned was a SSE which is still reported as running.

I have several computers running (some AVX and many SSE) and I notice that these phenomena seems to be intermittent and also typically affect either the SSE or AVX tasks.
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George Hinderliter

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Message 5011 - Posted: 3 Oct 2016, 23:29:43 UTC - in response to Message 5010.  
thanks I was just really scratching my head as to what was going on. I appreciate the feedback and will let them run. Just didn't know if I had some configuration issue or it was normal.
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Message boards : Number crunching : 100 fold increased in work unit run time