Hi Jeff,
> One thing I meant to ask: has this been happening for a long time?
I'm sorry, I don't know. In the past I used Sun Fortran 95 8.6.
> Or did you just start building the Fortran bindings?
No, I use the bindings from the beginning, but our admin installed the
new Oracle Solaris
To run a hybrid MPI/OpenMP code on a hyperthreaded machine with 24 virtual
cores, I've been using -n 12 --cpus-per-proc 2 so I can use
OMP_NUM_THREADS=2
I now see that --cpus-per-proc is deprecated in favour of --map-by, but
I've been struggling to find a conversion as the --map-by documentation
I’m trying to grok the problem, so bear with me a bit. It sounds like you have
a machine with 12 physical cores, each with two hyperthreads, and you have HT
turned on - correct?
If that is true, then the problem is that you are attempting to bind-to core
(of which you have 12), but asking for
Hi Ralph
I have a motherboard with 2 X6580 chips, each with 6 cores 2 way
hyperthreading, so /proc/cpuinfo reports 24 cores
Doing a pure compute OpenMP loop where I'd expect the number of iterations
in 10s to rise with number of threads
with gnu and mpich
OMP_NUM_THREADS=1 -n 1 : 112 iterations
We may be getting hung up on terminology, but my guess is that the problem is
one of accurately understanding how many cores you have vs ht’s.Can you run
lstopo and see what it thinks is there?
If you haven’t installed that, you can just run “mpirun -mca ess_base_verbose
10 -n 1 hostname” to
I have installed the up to date hwloc, jasson, netloc versions on IB cluster.
I generated the lstopo xml files for a number of nodes.
When I executed:
netloc_ib_gather_raw --out-dir ib-raw --hwloc-dir hwloc --sudo
Found 0 subnets in hwloc directory:
I searched the forum and someone had similar
This is a netloc question, not a Open MPI question, so please ask on
netloc-us...@open-mpi.org instead.
You should attach some of your lstopo outputs to ease debugging. Make
sure your lstopo reports I/O devices, it's required for netloc.
thanks
Brice
Le 05/12/2014 21:55, Faraj, Daniel A a
