On Tue, May 5, 2020 at 12:30 PM <[email protected]> wrote:
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Today's Topics:
1. Better alternatives of MPI_Allreduce() (hritikesh semwal) 2. Re: Better alternatives of MPI_Allreduce() (Benson Muite) 3. Re: Better alternatives of MPI_Allreduce() (Benson Muite) 4. Re: Better alternatives of MPI_Allreduce() (Joachim Protze)
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Message: 1 Date: Tue, 5 May 2020 11:08:20 +0530 From: hritikesh semwal <[email protected]> To: [email protected] Subject: [mpich-discuss] Better alternatives of MPI_Allreduce() Message-ID: <CAA+35d1zgxVjcfH= [email protected]> Content-Type: text/plain; charset="utf-8"
Hello all,
I am working on the development of a parallel CFD solver and I am using MPI_Allreduce for the global summation of the local errors calculated on all processes of a group and the summation is to be used by all the processes. My concern is that MPI_Allreduce is taking almost 27-30% of the total time used, which is a significant amount. So, I want to ask if anyone can suggest me better alternative/s to replace MPI_Allreduce which can reduce the time consumption.
Thank you.