CPU time resets on a restart.

Message boards : Number crunching : CPU time resets on a restart.

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John McLeod VII
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Message 1188 - Posted: 6 Sep 2009, 3:52:36 UTC
Last modified: 6 Sep 2009, 3:56:15 UTC

I just watched a Drug Discovery task drop from 54 minutes (where it was stopped to allow another task to run EDF) to a small number when the task was resumed.

In many projects (this one?) credit is granted based on benchmarks * time. The standard is that if there is one task when credit is granted, that task gets its credit request. If there are two, the high is dropped (to discourage cheating) and the low is granted to both. If there are 3 or more, the high and low credit requests are dropped and the rest are averaged.

The other possibility is that the task was restarted to the last checkpoint even though keep tasks in memory is set. If at all possible, it would be good to respect this setting when stopping the worker process.


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Profile Tim Turner
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Message 1189 - Posted: 6 Sep 2009, 4:12:37 UTC - in response to Message 1188.  
Last modified: 6 Sep 2009, 4:13:22 UTC

we know about this issue as there's not much of checkpointing in the current autodock app. theirs only one checkpoint and that is like 1-2 minutes into the wu. it's something we need to work on. it may get some attention after gpu gromacs is off the ground which maybe some time.
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John McLeod VII
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Message 1204 - Posted: 8 Sep 2009, 14:05:23 UTC - in response to Message 1189.  

we know about this issue as there's not much of checkpointing in the current autodock app. theirs only one checkpoint and that is like 1-2 minutes into the wu. it's something we need to work on. it may get some attention after gpu gromacs is off the ground which maybe some time.

The problem is that when left in memory, the shim application apparently unloads the worker application.


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Message boards : Number crunching : CPU time resets on a restart.


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