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Asked: 2026-05-30T01:05:23+00:00

I am writing code that involved a for loop that makes calculations at each

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I am writing code that involved a for loop that makes calculations at each index.

The smallest of these calculations is stored in a variable and I use MPI_Allreduce at the end of the program to determine the global minimum across all processes.

However, I need a way of knowing which process has the smallest value, i.e. can MPI_Allreduce tell me which process sends the result? the process with the smallest value? there is some additional data I need to get from that process.

Thanks in advance for any help!

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1 Answer

  1. Editorial Team

    You can use the MPI_MINLOC operator in the reduce operation to receive the rank of the process with the minimal value (more specifically, the lowest ranked process that has a minimal value).

    See http://www.netlib.org/utk/papers/mpi-book/node114.html#SECTION005103000000000000000

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