Hi all,
we use Chelsio S320E-CXA adapters
(http://www.chelsio.com/assetlibrary/products/S320E%20Product%20Brief%20080424.pdf) in one of our
clusters. After tuning the kernel i measured the ping pong latency via NetPIPE and got ~12us which
is pretty good for TCP i think. So i wrote a simple ping-pong-kernel and was really terrified about
the ~45us i got with OpenMPI 1.2.6. Are there any hints how we can reduce the MPI latency? To
increase the bandwidth we already set the buffer sizes but we couldn't find a parameter which can be
relevant for the latency. Every hint is welcome.
Thanks and best regards
Andy
--
Dresden University of Technology
Center for Information Services
and High Performance Computing (ZIH)
D-01062 Dresden
Germany
e-mail: andy.geo...@zih.tu-dresden.de
WWW: http://www.tu-dresden.de/zih
