I'm still poking around, but would appreciate a little more info to ensure I'm
looking in the right places. How many nodes are you running your application
across for your verification suite? I suspect it isn't just one :-)
On Apr 10, 2014, at 9:19 PM, Ralph Castain wrote:
> I shaved about 30
I shaved about 30% off the time - the patch is waiting for 1.8.1, but you can
try it now (see the ticket for the changeset):
https://svn.open-mpi.org/trac/ompi/ticket/4510#comment:1
I've added you to the ticket so you can follow what I'm doing. Getting any
further improvement will take a little
Hi again,
> Okay, I'll try to do a little poking around. Meantime, please send along the
> output from >"ompi_info" so we can see how this was configured and what built.
enclosed please find the requested information. It would be great to have an
workaround for 1.8 because with 1.8 our verific
On Apr 10, 2014, at 7:58 AM, Victor Vysotskiy
wrote:
> Dear Ralph,
>
>> it appears that 1.8 is much faster than 1.6.5 with the default settings, but
>> slower when you set btl=tcp,self?
>
> Precisely. However, with the default settings both versions are much slower
> compared to other MPI
Dear Ralph,
> it appears that 1.8 is much faster than 1.6.5 with the default settings, but
> slower when you set btl=tcp,self?
Precisely. However, with the default settings both versions are much slower
compared to other MPI distributions such as MPICH, MVAPICH, and proprietary
ones. The 'b
Going on the assumption that it was a copy/paste error, the next question is:
how many nodes were in your allocation?
I ask because there is a change in the way we launch between 1.8 and 1.6.5.
Starting in the 1.7 series, mpirun launches daemons across your allocation at
startup so it can colle
Just to ensure I understand what you are saying: it appears that 1.8 is much
faster than 1.6.5 with the default settings, but slower when you set
btl=tcp,self?
This seems rather strange. I note that the 1.8 value is identical in the two
cases, but somehow 1.6.5 went much faster in the latter ca
Dear Developers,
I have faced a performance degradation on multi-core single processor machine.
Specifically, in the most recent Open MPI v1.8 the initialization and process
startup stage became ~10x slower compared to v1.6.5. In order to measure
timings I have used the following code snippet
