Parallel run - number of processors

danvica · April 2, 2012, 11:44

Is it possible to change the number of processors at run-time ?

In our office we have 5 workstations but just 1 of them is full-time dedicated to CFD.

It would be usefull to switch the execution on during the night and switch it off the day (but independently one of each other).

If anyone has an idea... thanks.

Daniele

Phicau · April 2, 2012, 12:00

Hi

just reconstruct the latest time, change it to a new folder and start from that point decomposing with the new number of processors.

Pablo

danvica · April 2, 2012, 13:07

Thanks ! Not as quick as I'd like in my cfd lazy dreams, but enought to be done.

Thanks again for the hint.

Daniele

Phicau · April 3, 2012, 02:35

You are welcome, just another hint: there is no need to hard copy your constant folder unless your mesh has changed, so just make a link to it in the new folder, it may save you lots of space.

Pablo

alberto · April 5, 2012, 11:57

redistributePar is what you are looking for.

April 2, 2012, 11:44	Parallel run - number of processors	#1
danvica Senior Member Daniele Vicario Join Date: Mar 2009 Location: Novara, Italy Posts: 142 Rep Power: 17	Is it possible to change the number of processors at run-time ? In our office we have 5 workstations but just 1 of them is full-time dedicated to CFD. It would be usefull to switch the execution on during the night and switch it off the day (but independently one of each other). If anyone has an idea... thanks. Daniele

April 5, 2012, 11:57		#5
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	redistributePar is what you are looking for. __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

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April 2, 2012, 12:00		#2
Phicau Senior Member Pablo Higuera Join Date: Jan 2011 Location: Auckland Posts: 627 Rep Power: 19	Hi just reconstruct the latest time, change it to a new folder and start from that point decomposing with the new number of processors. Pablo

April 2, 2012, 13:07		#3
danvica Senior Member Daniele Vicario Join Date: Mar 2009 Location: Novara, Italy Posts: 142 Rep Power: 17	Thanks ! Not as quick as I'd like in my cfd lazy dreams, but enought to be done. Thanks again for the hint. Daniele

April 3, 2012, 02:35		#4
Phicau Senior Member Pablo Higuera Join Date: Jan 2011 Location: Auckland Posts: 627 Rep Power: 19	You are welcome, just another hint: there is no need to hard copy your constant folder unless your mesh has changed, so just make a link to it in the new folder, it may save you lots of space. Pablo