On 05/07/2012 08:50 AM, Samuel Thibault wrote:
This might be a bug in OPA. Can you send us the log of the OPA configure?
Also, a log of the mpich2 configure will be useful. If you are using
--with-device=ch3:sock, it doesn't use OPA, so it won't matter.
It's all on
https://buildd.debian.org/status/fetch.php?pkg=mpich2&arch=sparc&ver=1.4.1-4&stamp=1328215853
It does look like emulated locks are being used. Here's the interesting
part of the OPA configure:
configure: WARNING:
===================================================
Using locks to implement atomic primitives. This
will result in a substantial impact on performance.
Use this only for testing.
===================================================
Note that, as the warning suggests, on platforms that do not have native
atomics, the performance might not be very good. It might be better to
use --with-device=ch3:sock which doesn't use shared memory at all.
-- Pavan
--
Pavan Balaji
http://www.mcs.anl.gov/~balaji
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