[wenxu]

Hello, everyone.

Could anyone give me some hints how to gather statistics from different processors? e.g. the first two numbers of the list are calculated on processor 0, the second two numbers of the list are calculated on processor 1, etc. In other words, we have 8 cells of a computational domain and split the domain into 4 partitions.

processor 0: 8 (1 1 0 0 0 0 0 0);
processor 1: 8 (0 0 2 2 0 0 0 0);
processor 2: 8 (0 0 0 0 3 3 0 0);
processor 3: 8 (0 0 0 0 0 0 4 4);

Then how can I gather the list from all processors like: 8 (1 1 2 2 3 3 4 4)?

Any suggestion is appreciated! Thank you in advance!

regards,
wenxu

[wyldckat]

Greetings wenxu,

There's a test for that! Seriously, there is a test application in OpenFOAM's source code for merging lists from parallel processors, in the folder: "test/parallel" - you can see the path to this folder by running:

echo $FOAM_APP/test/parallel

Best regards,
Bruno

[dogukanteber]

Probably the problem is solved but for anyone who encounters the same problem in the future:

#include "PstreamReduceOps.H"
reduce(data, sumOp<labelList>());

Hope this helps

dogukanteber