VPU vs CPU time

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Mike
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VPU vs CPU time

#1 Post by Mike » Tue Aug 09, 2005 9:33 pm

What is the difference between VPU and CPU time given in the OUTCAR file?

Thank you,

Mike
Last edited by Mike on Tue Aug 09, 2005 9:33 pm, edited 1 time in total.

job
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VPU vs CPU time

#2 Post by job » Tue Aug 16, 2005 7:55 am

AFAIK VPU time is the cpu time, i.e. the amount of time the cpu has spent executing vasp. CPU time is the wallclock time. Yes, it's a bit backwards.

The difference CPU-VPU is the time spent on other tasks, or idling.
Last edited by job on Tue Aug 16, 2005 7:55 am, edited 1 time in total.

Mike
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VPU vs CPU time

#3 Post by Mike » Tue Aug 16, 2005 1:20 pm

When VASP is run in parallel, does VPU time include the time taken to send the data between each nodes or is it just the sum of the times taken individually by each node?
Last edited by Mike on Tue Aug 16, 2005 1:20 pm, edited 1 time in total.

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