e: Friday, March 11, 2016 at 11:19 AM
To: Open MPI Users <us...@open-mpi.org>
Subject: Re: [OMPI users] Poor performance on Amazon EC2 with TCP
Gary,
The current fine tuning of our TCP layer was done on a 1Gb network, and
might result in the performance degradation you see. There is
lt;mailto:us...@open-mpi.org>>
> Date: Tuesday, March 8, 2016 at 11:07 PM
> To: Open MPI Users <us...@open-mpi.org <mailto:us...@open-mpi.org>>
> Subject: Re: [OMPI users] Poor performance on Amazon EC2 with TCP
>
> Jackson,
>
> one more thing, how did you build
ardet <gil...@rist.or.jp
> <javascript:_e(%7B%7D,'cvml','gil...@rist.or.jp');>>
> Reply-To: Open MPI Users <us...@open-mpi.org
> <javascript:_e(%7B%7D,'cvml','us...@open-mpi.org');>>
> Date: Tuesday, March 8, 2016 at 11:07 PM
> To: Open MPI Users <us...@open-mp
: Open MPI Users <us...@open-mpi.org<mailto:us...@open-mpi.org>>
Subject: Re: [OMPI users] Poor performance on Amazon EC2 with TCP
Jackson,
one more thing, how did you build openmpi ?
if you built from git (and without VPATH), then --enable-debug is automatically
set, and this is hurting p
Jackson,
one more thing, how did you build openmpi ?
if you built from git (and without VPATH), then --enable-debug is
automatically set, and this is hurting performance.
if not already done, i recommend you download the latest openmpi tarball
(1.10.2) and
./configure
If you are using instance types that support SR-IOV (aka. "enhanced
networking" in AWS), then turn it on. We saw huge differences when SR-IOV
is enabled
http://blogs.scalablelogic.com/2013/12/enhanced-networking-in-aws-cloud.html
PI Users <us...@open-mpi.org>
> Date: Tuesday, March 8, 2016 at 9:39 AM
> To: Open MPI Users <us...@open-mpi.org>
> Subject: Re: [OMPI users] Poor performance on Amazon EC2 with TCP
>
>
> Jason,
>
> how many Ethernet interfaces are there ?
> if several, can
8, 2016 at 9:39 AM
To: Open MPI Users <us...@open-mpi.org>
Subject: Re: [OMPI users] Poor performance on Amazon EC2 with TCP
Jason,
how many Ethernet interfaces are there ?
if several, can you try again with one only
mpirun --mca btl_tcp_if_include eth0 ...
Cheers,
Gilles
On Tuesday, March
Jason,
how many Ethernet interfaces are there ?
if several, can you try again with one only
mpirun --mca btl_tcp_if_include eth0 ...
Cheers,
Gilles
On Tuesday, March 8, 2016, Jackson, Gary L. wrote:
>
> I've built OpenMPI 1.10.1 on Amazon EC2. Using NetPIPE, I'm
I've built OpenMPI 1.10.1 on Amazon EC2. Using NetPIPE, I'm seeing about half
the performance for MPI over TCP as I do with raw TCP. Before I start digging
in to this more deeply, does anyone know what might cause that?
For what it's worth, I see the same issues with MPICH, but I do not see it
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