New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

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

Open

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.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment