Thank you, Ralph and Gilles.
I didn't know about the OMPI_COMM_WORLD_LOCAL_RANK variable. Essentially,
this means I should be able to wrap my application call in a shell script
and have mpirun invoke that. Then within the script I can query this
variable and set correct OMP env variable, correct?
The OMP_PROC_BIND=CLOSE approach works, except it will bind threads to 1
hardware thread only (when HT is present). For example, doing the following
to run 2 procs per node each with 4 threads, the thread affinity info
(queried through sched_getaffinity()) comes out as below.
mpirun -np 2 --map-by
Hi everyone,
I am having trouble developing a complicated parallelization algorithm with
MPI and I'm hoping for some tips (I am using OpenMPI 1.10.2). I posted the
latest problem I ran into on Stack Overflow and got a response from someone
saying they don't think it is possible to do the spawn all
You may want to look at the —oversubscribe mpirun option.
If you want more control, you can consider making a rankfile where you place
explicitly processes.
Aurélien
> Le 29 juin 2016 à 11:50, Jason Maldonis a écrit :
>
> Hi everyone,
>
> I am having trouble developing a complicated paral
Hi,
I see in *mca_coll_sm_comm_query()* of *ompi/mca/coll/sm/coll_sm_module.c*
that al allreduce and bcast have shared memory implementations.
Is there a way to know if this implementation is being used when running my
program that calls these collectives?
Thank you,
Saliya
--
Saliya Ekanayake
