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February 26, 2009, 11:20 |
saving monitoring data
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#1 |
Guest
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Hi,
I have a 2d domain that i am running parallel on a cluster. I am interested in monitoring field variables in many points. For this i am using the monitor/surface/area-wighted-average for my different points. I want to gather the data for every time step. Now, the problem is that fluent REALLY saves the data in the file every time step. I notice that my calculation is now 50-70 % as fast as without monitoring. I can see, using top, that this is due to one node having a cortex and other process stealing CPU from the solver. How can i make fluent save the data in memory buffer before writing it to the files (lets say write the file every 200 time steps). ??? as it is now is just a waste.. Thanks! |
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February 27, 2009, 04:57 |
Re: saving monitoring data
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#2 |
Guest
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I am running fluent with the -g flag. So i am not using graphics at all.
I do not why there is a cortex process at all. I made sure it is not from some old crashed run of fluent. Did anyone experience this before? Suggestions for a solution? |
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March 3, 2009, 06:54 |
Re: saving monitoring data
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#3 |
Guest
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Hi again,
I now know that it is not due to the writing of each time step that i get a reduction in performance. If i do a test of writing, say every 60 time step, i still get the reduction in speed. i can see from "top" that a cortex process is fluctuating between 0 and 70 % of CPU on one node during 1 time step. Thus it seems that only the presence of my monitor points is enough to cause this problem. any ideas? |
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