On Fri, Feb 16, 2018 at 8:52 AM, Nathan Hjelm <hje...@me.com> wrote: > It depends on the transport used. If there is a high-performance network > (Cray Aries, Infiniband, etc) then the progress is handled by the hardware. > For other networks (Infinipath, Omnipath, TCP, etc) there are options. > > For TCP you can set: > > --mca btl_tcp_progress_thread 1 > > No such option currently exists for Infinipath and Omnipath. Though with > those networks you can use verbs but Intel does not support that mode of > operation and the performance can be bad for some operations (> 100 us > latency on compare-and-swap for example). >
If Intel Omni Path is the network of interest, I'd recommend using the OFI/libfabric transport layer in Open-MPI and asking the libfabric list ( http://lists.openfabrics.org/mailman/listinfo/libfabric-users) for instructions on how to enable asynchronous progress inside of libfabric. When I was testing RMA in Open-MPI on Omni Path a while ago, the performance of both PSM2 and OFI was quite good relative to other implementations, as measured by the OSU MPI benchmarks. I was using Casper (http://www.mcs.anl.gov/project/casper/) for asynchronous progress, although those tests don't necessary reveal a lack of asynchronous progress. Best, Jeff I don't know how well tested this support is. There haven't been many > requests for this feature so not much work has been done on it. > > -Nathan > > On Feb 16, 2018, at 08:46 AM, Ahmed Hamdy Mohamed Eleliemy < > ahmed.eleli...@unibas.ch> wrote: > > Hi all, > > I used to work with MPICH. I am trying now to compare and switch to > OpenMPI. I am using OpenMPI version 2.1.1. > To have progress for one-sided communications (in the passive mode). I > used to export the following environment variable MPICH_ASYNC_PROGRESS=1 > My questions are: > 1. What would be the equivalent option for openmpi? > 2. How openmpi handle the progress of the one-sided communications? > > Thanks in advance > > Best regards > Ahmed > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users > > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users > -- Jeff Hammond jeff.scie...@gmail.com http://jeffhammond.github.io/
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