[mvapich-discuss] How to make sure application is running on IB

[Choudhury, Durga]

Hi Wei

There has to be something a bit more reliable than this; for example, if
the machine has 10G Ethernet running TCP/IP, I suspect the latencies
will be comparable, if not lower.

Regards
Durga

-----Original Message-----
From: mvapich-discuss-bounces at cse.ohio-state.edu
[mailto:mvapich-discuss-bounces at cse.ohio-state.edu] On Behalf Of wei
huang
Sent: Tuesday, March 13, 2007 4:57 PM
To: Aliva Pattnaik
Cc: mvapich-discuss at cse.ohio-state.edu
Subject: Re: [mvapich-discuss] How to make sure application is running
on IB

Hi,

You can just compile and run osu_latency.c in the osu_benchmarks
directory
and see the latency you observed.

For Infiniband you should definitely observe <10us for 1 byte messages
(you probabaly will get far lower if your machines are with PCI-Ex NIC).
Otherwise something is wrong with the setup.

Thanks.

Regards,
Wei Huang

774 Dreese Lab, 2015 Neil Ave,
Dept. of Computer Science and Engineering
Ohio State University
OH 43210
Tel: (614)292-8501


On Tue, 13 Mar 2007, Aliva Pattnaik wrote:

> Hi,
>
> I am using mvapich2 which is compiled using the make.mvapich2.vapi
> script file where I am providing the path to ibgd library from
mellanox
> . The cluster that I am using has infiniband network. But I am
wondering
> how to make sure that my application is running over infiniband not
tcp/ip?
>
> Thank you very much for your answer,
> Aliva
>
>
>
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> mvapich-discuss at cse.ohio-state.edu
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>

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