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
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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 : j...@ncra.tifr.res.in
India
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