You could find the User Guide at
http://www.lam-mpi.org/download/files/7.0.2-user.pdf
helpful for your purpose.
You will find a few tunable parameters for the sysv and usysv as well as
coll modules in the documentation which might solve performance issues.
Hope it helps..
Nihar
On Wed, 12 Nov 2003, Ananthanaraya Sugavanam wrote:
- Q1. I built MPI LAM on AIX 5.1 on a POWER-3 system with XL compilers. The
- configure was run under OBJECT_MODE=64 and "--with-noromio --
- with-shm-poolsize=100000000
- --with-shm-short=8000
-
- The lamboot -V
- responds to
-
- SSI rpi : crtcp lamd sysv tcp usysv
-
- If I use this build on a POWER4 system, strictly within a node (for shared
- memory) are
- there any tunable parameters to improve performance ?
-
- 1. for message passing
- 2. for collective communication
-
- The build seems to run OK on a POWER4 system - but major performance issues
- relative to the
- Parallel Environment on several communication intensive applications. MPI
- LAM seems to be
- choking with some buffer size limits. Is there a remedy ?
-
-
-
-
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Nihar Sanghvi
LAM/MPI Team
Graduate Student (Indiana University)
http://www.lam-mpi.org
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