Message boards :
ATLAS application :
2-core ATLAS tasks running with 1 core only
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Author | Message |
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Send message Joined: 18 Dec 15 Posts: 1821 Credit: 118,920,098 RAC: 35,202 |
since this morning, I've observed that all 2-core ATLAS tasks are running with one CPU-core only. This becomes evident when looking at the Windows Task Manager as well as at the console where only 1 athena.py is shown. Also, the credit points for these tasks are about half compared to what they would normally be. Any idea what the problem is and how it can be solved? |
Send message Joined: 18 Dec 16 Posts: 123 Credit: 37,495,365 RAC: 0 |
Indeed I also have some 2-core tasks with 1 CPU core running, but only some of the tasks, not all. We are the product of random evolution. |
Send message Joined: 11 Aug 11 Posts: 6 Credit: 16,714,519 RAC: 0 |
all your ATLAS tasks today seem to have almost twice the CPU time versus runtime That would be normal for two cpu's running on short jobs its not quite 2x I think the startup times which can run to 10 minutes is only done with one CPU and with that a significant part of these short tasks might make it look like its only using one cpu since all the tasks are short except for a few the credits will be smaller than normal. after running a lot of long jobs and having credits normalized downward short jobs get shorted on credits. Its called creditscrew over at SETI |
Send message Joined: 19 Feb 08 Posts: 708 Credit: 4,336,250 RAC: 0 |
On the Windows 10 PC I had a task running on one core which gave me 3200 credits. Tullio |
Send message Joined: 18 Dec 15 Posts: 1821 Credit: 118,920,098 RAC: 35,202 |
On the Windows 10 PC I had a task running on one core which gave me 3200 credits. this somehow confirms that as far as credits are concerned, it's like playing lottery :-) |
Send message Joined: 13 May 14 Posts: 387 Credit: 15,314,184 RAC: 0 |
Can those of you experiencing the problem give links to example results? I don't see the problem myself but I'm running only native tasks at the moment. |
Send message Joined: 18 Dec 16 Posts: 123 Credit: 37,495,365 RAC: 0 |
Hi David, The issue mentioned by Erich, and that I experienced myself as well, was apparently related to a batch of short tasks. This batch is over now I think. I suggest to create a discussion thread dedicated to issues related to the number of athena.py processes within a task. In this thread could be addressed both cases like this one reported by Erich, and the case I reported of duplicated and triplicated processes. Regards, Herve We are the product of random evolution. |
Send message Joined: 18 Dec 15 Posts: 1821 Credit: 118,920,098 RAC: 35,202 |
David wrote: Can those of you experiencing the problem give links to example results? I don't see the problem myself but I'm running only native tasks at the moment. David, sorry for the late reply; this was one of them: https://lhcathome.cern.ch/lhcathome/result.php?resultid=158264982 |
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