MPICH -- mpi returns myrank = 0 for all processors

[cjoycd]

MPICH has been installed in Kubuntu 24.04 LTS as below

sudo apt-get update,
sudo apt install build-essential,
sudo apt install mpich libmpich-dev

After installation, with a simple test code it fails to return correct rank values for each processors (all have zero rank). Only MPICH is being installed, no other MPI such openMPI is working in parallel. How to fix the issue? Any suggestions?

[hzhou]

Sorry for the neglect. The issue is due to running mpiexec from Open MPI. The ubuntu default to use openMPI for dependency, so it is easy for them to mess this up.

[cjoycd]

Thank you for your email.. I have fixed this problem by using a fresh installation of MPICH using source code. Regards

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On Wed, Aug 21, 2024 at 9:58 AM Hui Zhou ***@***.***> wrote: Sorry for the neglect. The issue is due to running mpiexec from Open MPI. The ubuntu default to use openMPI for dependency, so it is easy for them to mess this up. — Reply to this email directly, view it on GitHub <#7064 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AIUNJIFGRXWDDF4QX5SX3YTZSQJOXAVCNFSM6AAAAABK2ZFA7GVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDGMBQHA3DKOJSGY> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[hzhou]

Just tested ubuntu 24.04 using docker. Indeed it is broken. The issue is they build mpich with --with-pmix=/usr/lib/x86_64-linux-gnu/pmix2, which forces to disable hydra's launch, and need to be launched with openpmix or openmpi's launcher instead. We need reach out to the package maintainer to fix this.

[cjoycd]

Ok, thanks a lot for the update.

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On Wed, Aug 21, 2024 at 10:23 AM Hui Zhou ***@***.***> wrote: Just tested ubuntu 24.04 using docker. Indeed it is broken. The issue is they build mpich with --with-pmix=/usr/lib/x86_64-linux-gnu/pmix2, which forces to disable hydra's launch, and need to be launched with openpmix or openmpi's launcher instead. We need reach out to the package maintainer to fix this. — Reply to this email directly, view it on GitHub <#7064 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AIUNJIERD6S4HZLH757FJMTZSQMK5AVCNFSM6AAAAABK2ZFA7GVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDGMBRGAZDMMRZGA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[raffenet]

FYI we were informed that the configuration issue would be fixed in the next update to the mpich package. https://bugs.launchpad.net/ubuntu/+source/mpich/+bug/2072338. I have not yet seen the update in the package repos, though.

[cjoycd]

Awesome, thanks for the update!

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On Wed, 11 Sep 2024 at 9:15 PM, Ken Raffenetti ***@***.***> wrote: FYI we were informed that the configuration issue would be fixed in the next update to the mpich package. https://bugs.launchpad.net/ubuntu/+source/mpich/+bug/2072338. I have not yet seen the update in the package repos, though. — Reply to this email directly, view it on GitHub <#7064 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AIUNJIHFWW7LILSDEEZXJLLZWBQR5AVCNFSM6AAAAABK2ZFA7GVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDGNBUGAZTGNZUGQ> . You are receiving this because you authored the thread.Message ID: ***@***.***>