cluster:125
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cluster:125 [2014/02/25 14:25] hmeij [What May Also Change?] |
cluster:125 [2014/02/25 14:25] hmeij [What May Also Change?] |
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| * if there is no ‘sharing’ required the hyper-threaded node performs the same (that is the operating systems presents 16 cores but only up to 8 jobs are allowed to run, lets say by limiting the JL/H parameter of the queue) | * if there is no ‘sharing’ required the hyper-threaded node performs the same (that is the operating systems presents 16 cores but only up to 8 jobs are allowed to run, lets say by limiting the JL/H parameter of the queue) | ||
| - | if there is ‘sharing’ jobs take a 44% speed penalty, however more of them can run, twice as many | + | * if there is ‘sharing’ jobs take a 44% speed penalty, however more of them can run, twice as many |
| So it appears that we could turn hyperthreading on and despite the nodes presenting 16 cores we could limit the number of jobs to 8 until the need arises to run many small jobs and then reset the limit to 16. | So it appears that we could turn hyperthreading on and despite the nodes presenting 16 cores we could limit the number of jobs to 8 until the need arises to run many small jobs and then reset the limit to 16. | ||
cluster/125.txt · Last modified: 2014/02/26 15:32 by hmeij
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