Author Topic: parallel NumForce no speed up  (Read 5240 times)

basklau

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parallel NumForce no speed up
« on: March 06, 2009, 10:04:41 AM »
Hi everyone,

with the help of the forum I managed to get the parallel version of NumForce started. But now I realised that there only a relativly small speed up. The problem that occurs is the following:
We have computers with 4 processors. In the hostfile I wrote all 4 processors and it started normally. But after a while all four processes no matter whether dscf or egrad is started have only a load of 0.33  but the overall load is 4 !
I think this is due to file writing. Is there a possibity to reduce filewriting and to use more RAM for example. I cannot find anything in the manual.

Thanks basklau
« Last Edit: March 11, 2009, 01:01:09 PM by basklau »

christof.haettig

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Re: parallel NumForce no speed up
« Reply #1 on: March 27, 2009, 02:46:41 PM »
Of cause the I/O load and thus the precentage of time spend in the I/O increases the more processses are started on a single machine. But what you write below sounds for me a bit extrem... How long do the individual points (one dscf or one escf
calculation take?)

Christof