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How to Create MultiFabs Only in the Root Process When Running a Program with Multiple CPUs? #4092

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ztdepztdep opened this issue Aug 18, 2024 · 1 comment

ztdepztdep commented Aug 18, 2024

I am planning to run my program with 8 CPUs, and I need to create MultiFabs only in the root process. Could you please help me with this?

Member

WeiqunZhang commented Aug 19, 2024

BoxArray ba(......);
int nprocs = ParallelDescriptor::NProcs();
int root = 0;
DistributionMapping dm(Vector<int>(nprocs,root));
MultiFab mf(ba, dm, ......);

Note that if MPI communication is not needed, FArrayBox might also serve the purpose.

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