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Subject: Re: [OMPI users] Myrinet optimization with OMP1.3 and macosX
From: Scott Atchley (atchley_at_[hidden])
Date: 2009-03-20 12:10:10


On Mar 20, 2009, at 11:33 AM, Ricardo Fernández-Perea wrote:

> This are the results initially
> Running 1000 iterations.
> Length Latency(us) Bandwidth(MB/s)
> 0 2.738 0.000
> 1 2.718 0.368
> 2 2.707 0.739
> <snip>
> 1048576 4392.217 238.735
> 2097152 8705.028 240.913
> 4194304 17359.166 241.619
>
> with export MX_RCACHE=1
>
> Running 1000 iterations.
> Length Latency(us) Bandwidth(MB/s)
> 0 2.731 0.000
> 1 2.705 0.370
> 2 2.719 0.736
> <snip>
> 1048576 4265.846 245.807
> 2097152 8491.122 246.982
> 4194304 16953.997 247.393

Ricardo,

I am assuming that these are PCI-X NICs. Given the latency and
bandwidth, are these "D" model NICs (see the top of the mx_info
output)? If so, that looks about as good as you can expect.

Have you run Intel MPI Benchmark (IMB) or another MPI pingpong type
benchmark?

Scott