Hi Ethan,
Bummer. What does the following command show?
sysctl -a | grep shm
Thanks!
--
Samuel K. Gutierrez
Los Alamos National Laboratory
On Apr 29, 2010, at 1:32 PM, Ethan Mallove wrote:
Hi Samuel,
I'm trying to run off your HG clone, but I'm seeing issues with
c_hello, e.g.,
$ mpirun -mca mpi_common_sm sysv --mca btl self,sm,tcp --host burl-
ct-v440-2,burl-ct-v440-2 -np 2 ./c_hello
--------------------------------------------------------------------------
A system call failed during shared memory initialization that should
not have. It is likely that your MPI job will now either abort or
experience performance degradation.
Local host: burl-ct-v440-2
System call: shmat(2)
Process: [[43408,1],1]
Error: Invalid argument (errno 22)
--------------------------------------------------------------------------
^Cmpirun: killing job...
$ uname -a
SunOS burl-ct-v440-2 5.10 Generic_118833-33 sun4u sparc SUNW,Sun-
Fire-V440
The same test works okay if I s/sysv/mmap/.
Regards,
Ethan
On Wed, Apr/28/2010 07:16:12AM, Samuel K. Gutierrez wrote:
Hi,
Faster component initialization/finalization times is one of the main
motivating factors of this work. The general idea is to get away
from
creating a rather large backing file. With respect to module
bandwidth and
latency, mmap and sysv seem to be comparable - at least that is
what my
preliminary tests have shown. As it stands, I have not come across a
situation where the mmap SM component doesn't work or is slower.
Hope that helps,
--
Samuel K. Gutierrez
Los Alamos National Laboratory
On Apr 28, 2010, at 5:35 AM, Bogdan Costescu wrote:
On Tue, Apr 27, 2010 at 7:55 PM, Samuel K. Gutierrez <sam...@lanl.gov
>
wrote:
With Jeff and Ralph's help, I have completed a System V shared
memory
component for Open MPI.
What is the motivation for this work ? Are there situations where
the
mmap based SM component doesn't work or is slow(er) ?
Kind regards,
Bogdan
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