Hi all, I recently inserted
 

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

We use probes all the time and
 

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?

I'm using RedHat Enterprise Li
 

I'm using RedHat Enterprise Linux 4.4

Can you upgrade to 4.5? There
 

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.

It would take several days for
 

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