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July 29, 2008, 12:44 |
Hi all,
I recently inserted
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#1 |
New Member
Scott Ford
Join Date: Mar 2009
Location: Pennsylvania, USA
Posts: 7
Rep Power: 17 |
Hi all,
I recently inserted a probe into my controlDict so that I could track the velocity of my flow at a specific point more precisely. Before inserting the probe, I could get 1 second of data simulation in about 10 hours of computer time. But since I have inserted the probe, I am now looking at the time frame of 1 second of simulation for about 150 hours of computer time. This is clearly unacceptable and not worth the cost of calculation. Has anybody else experienced a similar problem or is this just what the probe function must do? Can anybody get me back to the time frame i was looking at before? Thanks ahead of time. Scott |
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July 30, 2008, 04:58 |
We use probes all the time and
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#2 |
Senior Member
Eugene de Villiers
Join Date: Mar 2009
Posts: 725
Rep Power: 21 |
We use probes all the time and have not experienced such a problem. My guess is it has something to do with disk access. What operating system are you running on?
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July 30, 2008, 08:31 |
I'm using RedHat Enterprise Li
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#3 |
New Member
Scott Ford
Join Date: Mar 2009
Location: Pennsylvania, USA
Posts: 7
Rep Power: 17 |
I'm using RedHat Enterprise Linux 4.4
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July 30, 2008, 09:55 |
Can you upgrade to 4.5? There
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#4 |
Senior Member
Eugene de Villiers
Join Date: Mar 2009
Posts: 725
Rep Power: 21 |
Can you upgrade to 4.5? There was a bug in NFS in one of the RHEL kernels, either 4.3 or 4.4, I'm not sure which, which causes the problems you are encountering.
We had a situation where the run would slow down massively after the first write to disk and it went away after the OS was upgraded. |
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July 30, 2008, 10:05 |
It would take several days for
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#5 |
New Member
Scott Ford
Join Date: Mar 2009
Location: Pennsylvania, USA
Posts: 7
Rep Power: 17 |
It would take several days for us to upgrade to 4.5, so its not likely. I do know of the problem you had with time increasing after your first write to disk and I know that was fixed with version 4.4. I guess I'll keep trying some stuff, however I'm still unsure what the root of the problem is. Thanks.
Scott |
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