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).
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
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