[Pw_forum] Trying to find reasonable parallelization parameters

[J. J. Ramsey]

----- Original Message ----


> JJR> OpenMPI 1.2.3. Unfortunately, I don't really have a whole lot of 
> JJR> control over the MPI implementation. It's on a cluster where I have 
> 
> oh. you can compile your own. compiling MPI does not require
> administrator privilege.

Compiling is one thing. The cluster, however, has its own mpirun.lsf script, and the number of CPUs to request is handled through the queueing system. Also, I'm not sure how I'd make sure that OpenMPI was set up so that mpiexec could access all the compute nodes in the cluster. It's not like I'm compiling it on a multi-core workstation.

> please try adding 
> the following settings to your mpirun commandline as it is.
> 
> --mca btl_openib_use_srq 1
> 
> and
> 
> --mca mpi_leave_pinned 1

Might I be able to use those with the stock MPI implementation on the cluster?