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Subject: Re: [OMPI users] max. message size
From: Mike Dubman (miked_at_[hidden])
Date: 2013-07-17 09:15:41

do you use IB as a transport? max message size in IB/RDMA is limited to
2G, but OMPI 1.7 splits large buffers during RDMA into 2G chunks.

On Wed, Jul 17, 2013 at 11:51 AM, mohammad assadsolimani <
m.assadsolimani_at_[hidden]> wrote:

> Dear all,
> I do my PhD in physics and use a program, which uses openmpi for
> a sophisticated calculation.
> But there is a Problem with "max. message size ". That is limited to ~2GB.
> Someone suggested that I have to use chunks i.e. I have to disassemble
> the massages
> in smaller massages. That might be nice, but I do not know how?
> I often was searching the last time in internet however I did not get an
> example.
> Is there any other possibility to increase this volume without
> manipulation of
> the code?
> The version of my ompi: mpirun (Open MPI) 1.5.5
> I am very grateful for all of your help and thank you in advanced
> Mohammad
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