[lentschi]

Hello everyone,

i want to split my Solver-process in 2 divisions:

At first, cfx should ONLY produce a partitioning file <parfile>. That's quite easy to perform with the "part-only" command.

Afterwards I want to read in this <parfile> and then to start the solver.

Therefore I used following commands:

cfx5solve -def test.def -part-only 24

and then in another script:
cfx5solve -def test.def -parfile-read test.par

cfx5solve -def test.def -par-dist <host-list> -start-method "HP MPI Distributed Parallel" -double -name tmp -ccl upwind.ccl

cfx5solve -def test.def -par-dist <host-list> -start-method "HP MPI Distributed Parallel" -double -ini Upwind.res

Or should I put the parfile-read command and the -par-dist in one line like this:

cfx5solve -def test.def -parfile-read test.par -par-dist 24 -start-method "HP MPI Distributed Parallel" -double -name tmp -ccl upwind.ccl

cfx5solve -def test.def -par-dist 24 -start-method "HP MPI Distributed Parallel" -double -ini Upwind.res


The Solver should perfom some "Upwind" steps and then switch to "High Resolution"
Without this splitting of the partitioning part, the Solving works!

Thanks in advance.

Regards Markus

[lentschi]

I got it:

to partition only:

cfx5solve -def test.def -part-only #Partitions

and then to solve:

cfx5solve -def test.def -par-dist #CPUs -parfile-read <parfile> -start-method "HP MPI Distributed Parallel" .......

[pavitran]

What is the advantage of this method when compared with default partitioning command "-part" ?

[joey2007]

If you change nothing in the mesh, it is possible to reuse the par-file. This means can save the time for the partitioning.