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From: Jayanta Roy (jroy_at_[hidden])
Date: 2006-10-23 14:08:19


Hi George,

Yes, it is duplex BW. The BW benchmark is a simple timing call around
MPI_Alltoall call. Then you estimate the network traffic from the sending
buffer size and get the rate.

Regards,
Jayanta

On Mon, 23 Oct 2006, George Bosilca wrote:

> I don't know what your bandwidth tester look like, but 140MB/s it's
> way too much for a single Gige card, except if it's a bidirectional
> bandwidth. Usually, on a new generation Gige card (Broadcom
> Corporation NetXtreme BCM5751 Gigabit Ethernet PCI Express) with a
> AMD processor (AMD Athlon(tm) 64 Processor 3500+) I only manage to
> get around 800Mb/s out of a point-to-point transfer. With an external
> card not on the OCI-express bus I barely get 600Mb/s...
>
> Why you don't use a real network performance tool such as Netpipe. At
> least it will insure you that the bandwidth is the one you expect.
>
> Thanks,
> george.
>
> On Oct 23, 2006, at 4:56 AM, Jayanta Roy wrote:
>
>> Hi,
>>
>> Sometime before I have posted doubts about using dual gigabit support
>> fully. See I get ~140MB/s full duplex transfer rate in each of
>> following
>> runs.....
>>
>> mpirun --mca btl_tcp_if_include eth0 -n 4 -bynode -hostfile host a.out
>>
>> mpirun --mca btl_tcp_if_include eth1 -n 4 -bynode -hostfile host a.out
>>
>> How to combine these two port or use a proper routing table in
>> place host
>> file? I am using openmpi-1.1 version.
>>
>> -Jayanta
>> _______________________________________________
>> users mailing list
>> users_at_[hidden]
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jayanta Roy
National Centre for Radio Astrophysics | Phone : +91-20-25697107
Tata Institute of Fundamental Research | Fax : +91-20-25692149 Pune
University Campus, Pune 411 007 | e-mail : jroy_at_[hidden]
India
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