[mvapich-discuss] Verify the application is really running over IB

[wgy at altair.com.cn]

hello, Dhabaleswar:
I downloaded
https://mvapich.cse.ohio-state.edu/svn/mpi/mvapich/trunk/osu_benchmarks/osu_latency.c
how can I run the benchmark then? I mean how many cpus or nodes should be
involved?
Thanks a lot.
Henry, Wu
|
|
| On Wed, 29 Aug 2007 wgy at altair.com.cn wrote:
|
|> Hello, list:
|> It might be a silly questions but I wonder how to verify run with
|> mvapich
|> (come with Topspin Infiniband) over Infiniband, NOT Gigabite network.
|> Is there an option to force mvapich to use IB network otherwise just
|> exits?
|
| MVAPICH has several underlying interfaces: Gen2, uDAPL, VAPI, TCP/IP and
| shared memory. Please take a look at the user guide (available from
| mvapich project page) to see the differences and capabilities of these
| interfaces. Gen2 interface (corresponding to OFED) will give you
| the best performance and scalability. If you have OFED stack installed,
| you should be able to configure mvapich to run over Gen2 interface
| (as per the instructions indicated in the user guide). During OFED
| installation, you can also select mvapich from the package.
|
| On your existing installation, you can also run OSU benchmarks (such
| as OSU latency). If you get latency number in the range of 2~4 microsec
| for short messages (say 4 bytes), it is already running over the native
| IB.
|
| Hope this helps.
|
| DK
|
|> Thanks for your suggestion.
|> Rdgs.
|> Henry, Wu
|>
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|
|