On 7/13/08, Pavel Shamis (Pasha) <pasha@dev.mellanox.co.il> wrote:

Jeff Squyres wrote:

Brad and I did some scale testing of IBCM and saw this error sometimes. It seemed to happen with higher frequency when you increased the number of processes on a single node.

I talked to Sean Hefty about it, but we never figured out a definitive cause or solution. My best guess is that there is something wonky about multiple processes simultaneously interacting with the IBCM kernel driver from userspace; but I don't know jack about kernel stuff, so that's a total SWAG.

Thanks for reminding me of this issue; I admit that I had forgotten about it. :-( Pasha -- should IBCM not be the default?

It is not default. I guess Lenny configured it explicitly, is not it ?

Pasha.

On Jul 13, 2008, at 7:08 AM, Lenny Verkhovsky wrote:

Hi,

I am getting this error sometimes.

/home/USERS/lenny/OMPI_COMP_PATH/bin/mpirun -np 100 -hostfile /home/USERS/lenny/TESTS/COMPILERS/hostfile /home/USERS/lenny/TESTS/COMPILERS/hello
[witch24][[32428,1],96][../../../../../ompi/mca/btl/openib/connect/btl_openib_connect_ibcm.c:769:ibcm_component_query] failed to ib_cm_listen 10 times: rc=-1, errno=22
Hello world! I'm 0 of 100 on witch2

Best Regards

Lenny.

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