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  1. Data Management
  2. DM-4404

Re-evaluate MPI comm workaround

    Details

    • Type: Story
    • Status: Won't Fix
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: ctrl_pool
    • Labels:
      None
    • Team:
      Data Facility

      Description

      In ctrl_pool's pool.py, we have a Comm class that appears to work around an OpenMPI bug. In his review for DM-2983, Matias Carrasco Kind requests that we check whether this is still necessary.

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            price Paul Price added a comment -

            Some clarifications:

            • I've only ever used this to wrap an MPICH communicator, not OpenMPI.
            • I'm not sure the behaviour we're working around is a bug — it's busy-waiting because it's constantly reading in expectations of instructions, for the most immediate response.
            Show
            price Paul Price added a comment - Some clarifications: I've only ever used this to wrap an MPICH communicator, not OpenMPI. I'm not sure the behaviour we're working around is a bug — it's busy-waiting because it's constantly reading in expectations of instructions, for the most immediate response.
            Hide
            mcarras2 Matias Carrasco Kind added a comment -

            I wasn't aware of this issue, according to this page (taken from the revision and reading Paul's comment there)
            https://groups.google.com/forum/?fromgroups=#!topic/mpi4py/nArVuMXyyZI
            this was an issue of OPEN MPI, and given the date I was wondering whether this is not longer an issue in openmpi 1.8.3 ,
            so I wasn't sure about this wrapper on the Communicator

            Show
            mcarras2 Matias Carrasco Kind added a comment - I wasn't aware of this issue, according to this page (taken from the revision and reading Paul's comment there) https://groups.google.com/forum/?fromgroups=#!topic/mpi4py/nArVuMXyyZI this was an issue of OPEN MPI, and given the date I was wondering whether this is not longer an issue in openmpi 1.8.3 , so I wasn't sure about this wrapper on the Communicator
            Hide
            mbutler Michelle Butler added a comment -

            extremely old issue, and cleaning up old tickets.  Closing.  11/23/2015.  

            Show
            mbutler Michelle Butler added a comment - extremely old issue, and cleaning up old tickets.  Closing.  11/23/2015.  

              People

              • Assignee:
                Unassigned
                Reporter:
                jbosch Jim Bosch
                Watchers:
                Jim Bosch, Matias Carrasco Kind, Michelle Butler, Paul Price
              • Votes:
                0 Vote for this issue
                Watchers:
                4 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved:

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