memory allocation when partitioning

rae · September 21, 2016, 21:22

Only the memory available to a single processor seems to be allocated to the partitioner despite 3x the memory being allocated (via command line specification) for the 3 processor (48 core) run. I'm running on a unix shell with Intel MPI.

Is there a partitioner -ccl or command line way around this without using slow virtual memory or a physical memory upgrade? Thanks.

ghorrocks · September 22, 2016, 08:48

Have a look at the large model partitioner. It works better on large models. Also look at simpler partitioning algorithms - the default METIS uses more memory than the alternatives (but the alternatives need a bit of thought to use them properly).

Opaque · September 22, 2016, 10:34

From the command line, you can use

cfx5solve -help | more

and read the different options for memory allocation. There are specific options for the pre-processing step (-size-ccl), partitioner (-size-part), interpolation (-size-interp)..

Hope the above helps

rae · September 23, 2016, 01:29

I have been using the large partitioner for the problem by necessity (due to size) and have been allocating the memory using the documented command line -size-part options which are the same as those listed using -help.

Using other partitioners remains an option but I am given to understand there is no ready means of splitting the job across more than one processors.

Thanks for thinking about it.

September 21, 2016, 21:22	memory allocation when partitioning	#1
rae New Member Join Date: May 2011 Posts: 21 Rep Power: 0	Only the memory available to a single processor seems to be allocated to the partitioner despite 3x the memory being allocated (via command line specification) for the 3 processor (48 core) run. I'm running on a unix shell with Intel MPI. Is there a partitioner -ccl or command line way around this without using slow virtual memory or a physical memory upgrade? Thanks.

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September 22, 2016, 08:48		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Have a look at the large model partitioner. It works better on large models. Also look at simpler partitioning algorithms - the default METIS uses more memory than the alternatives (but the alternatives need a bit of thought to use them properly).

September 22, 2016, 10:34		#3
Opaque Senior Member Join Date: Jun 2009 Posts: 1,804 Rep Power: 32	From the command line, you can use cfx5solve -help \| more and read the different options for memory allocation. There are specific options for the pre-processing step (-size-ccl), partitioner (-size-part), interpolation (-size-interp).. Hope the above helps

September 23, 2016, 01:29		#4
rae New Member Join Date: May 2011 Posts: 21 Rep Power: 0	I have been using the large partitioner for the problem by necessity (due to size) and have been allocating the memory using the documented command line -size-part options which are the same as those listed using -help. Using other partitioners remains an option but I am given to understand there is no ready means of splitting the job across more than one processors. Thanks for thinking about it.