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Old   October 6, 2011, 14:11
Default Use of Partition file
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Hi ,

I am using a large mesh for my simulation in parallel run mode. Now every time when a simulation restarts, cfx solver manager first partitions the mesh into the requested number of partitions (equal to number of CPUs requested) and then starts the solution.
I know that it is possible to pre-partition a mesh and store the partition info in a partition file and then give this file as input to cfx solver manager. So each time simulation has to restart , cfx solver manager uses the info in this file and does not waste time in partitioning the mesh on every restart.
However, from the cfx manuals ( I am using ver 12.1), I am not able to understand as to how to generate the partition file and use it.
Any guidance on this will be greatly helpful.

Thanks for your inputs!
Chander
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Old   October 6, 2011, 17:44
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cfx5solve -help

This will show the command line options to create the partition file.
you can pipe it a file so you can open it in a text editor.

-parfile-read <parfile>
Specifies the name of an input partition file used to set up a partitioning or parallel run.

-parfile-write <parfile>
Specifies the name of a partition file to write to, containing the information from a partitioning run.

-part-only <# of partitions>
Runs the solver in partitioning mode only. This is normally equivalent to -part, but may be necessary if partitioning a results file from a previous run.
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Old   October 9, 2011, 08:56
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@mjgarf

Thanks for your reply.
Now I am able to generate and use a partition file.
One question.

While launching the CFX run to generate the partition file, I specify that the run to be a partition run by including the command
-partition-only
in the overall command.
But still, the solver starts after partitioning the mesh.
Shouldn't a partion only run stop after partitioning the mesh?
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