On Oct 18, 2007, at 7:56 AM, Gleb Natapov wrote:
Open MPI v1.2.4 (and newer) will get around 1.5us latency with 0 byte
ping-pong benchmarks on Mellanox ConnectX HCAs. Prior versions of
Open MPI can also achieve this low latency by setting the
btl_openib_use_eager_rdma MCA parameter to 1.
Actu
On Wed, Oct 17, 2007 at 05:43:14PM -0400, Jeff Squyres wrote:
> Several users have noticed poor latency with Open MPI when using the
> new Mellanox ConnectX HCA hardware. Open MPI was getting about 1.9us
> latency with 0 byte ping-pong benchmarks (e.g., NetPIPE or
> osu_latency). This has b
Several users have noticed poor latency with Open MPI when using the
new Mellanox ConnectX HCA hardware. Open MPI was getting about 1.9us
latency with 0 byte ping-pong benchmarks (e.g., NetPIPE or
osu_latency). This has been fixed in OMPI v1.2.4.
Short version:
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Open MPI v1
