Hmmm…let me see if I can remember :-) Procs-per-object is what it does, of course, but I honestly forget what that last “r” stands for!
So what your command line is telling us is: map 2 processes on each socket, binding each process to 7 cpu’s (“pe” = processing element) In this case, we have defaulted to using cores as cpu’s (or “pe’s”). You could also set —use-hwthread-cpus and then “pe” would indicate the number of HTs to use for each process. For a hybrid app, you probably want to ensure you have at least one pe for each thread you intend to spawn - but that is something you can experiment with to find the best option. I had hoped to someday make that a little easier by integrating OpenMP with OMPI a little better, but that ran into some controversy and so I abandoned it. HTH Ralph > On Jan 6, 2016, at 12:33 PM, Matt Thompson <fort...@gmail.com> wrote: > > A ha! The Gurus know all. The map-by was the magic sauce: > > (1176) $ env OMP_NUM_THREADS=7 KMP_AFFINITY=compact mpirun -np 4 -map-by > ppr:2:socket:pe=7 ./hello-hybrid.x | sort -g -k 18 > Hello from thread 0 out of 7 from process 0 out of 4 on borgo035 on CPU 0 > Hello from thread 1 out of 7 from process 0 out of 4 on borgo035 on CPU 1 > Hello from thread 2 out of 7 from process 0 out of 4 on borgo035 on CPU 2 > Hello from thread 3 out of 7 from process 0 out of 4 on borgo035 on CPU 3 > Hello from thread 4 out of 7 from process 0 out of 4 on borgo035 on CPU 4 > Hello from thread 5 out of 7 from process 0 out of 4 on borgo035 on CPU 5 > Hello from thread 6 out of 7 from process 0 out of 4 on borgo035 on CPU 6 > Hello from thread 0 out of 7 from process 1 out of 4 on borgo035 on CPU 7 > Hello from thread 1 out of 7 from process 1 out of 4 on borgo035 on CPU 8 > Hello from thread 2 out of 7 from process 1 out of 4 on borgo035 on CPU 9 > Hello from thread 3 out of 7 from process 1 out of 4 on borgo035 on CPU 10 > Hello from thread 4 out of 7 from process 1 out of 4 on borgo035 on CPU 11 > Hello from thread 5 out of 7 from process 1 out of 4 on borgo035 on CPU 12 > Hello from thread 6 out of 7 from process 1 out of 4 on borgo035 on CPU 13 > Hello from thread 0 out of 7 from process 2 out of 4 on borgo035 on CPU 14 > Hello from thread 1 out of 7 from process 2 out of 4 on borgo035 on CPU 15 > Hello from thread 2 out of 7 from process 2 out of 4 on borgo035 on CPU 16 > Hello from thread 3 out of 7 from process 2 out of 4 on borgo035 on CPU 17 > Hello from thread 4 out of 7 from process 2 out of 4 on borgo035 on CPU 18 > Hello from thread 5 out of 7 from process 2 out of 4 on borgo035 on CPU 19 > Hello from thread 6 out of 7 from process 2 out of 4 on borgo035 on CPU 20 > Hello from thread 0 out of 7 from process 3 out of 4 on borgo035 on CPU 21 > Hello from thread 1 out of 7 from process 3 out of 4 on borgo035 on CPU 22 > Hello from thread 2 out of 7 from process 3 out of 4 on borgo035 on CPU 23 > Hello from thread 3 out of 7 from process 3 out of 4 on borgo035 on CPU 24 > Hello from thread 4 out of 7 from process 3 out of 4 on borgo035 on CPU 25 > Hello from thread 5 out of 7 from process 3 out of 4 on borgo035 on CPU 26 > Hello from thread 6 out of 7 from process 3 out of 4 on borgo035 on CPU 27 > > So, a question: what does "ppr" mean? The man page seems to accept it as an > axiom of Open MPI: > > --map-by <foo> > Map to the specified object, defaults to socket. Supported > options include slot, hwthread, core, L1cache, L2cache, L3cache, socket, numa, > board, node, sequential, distance, and ppr. Any object can > include modifiers by adding a : and any combination of PE=n (bind n > processing > elements to each proc), SPAN (load balance the processes > across the allocation), OVERSUBSCRIBE (allow more processes on a node than > pro‐ > cessing elements), and NOOVERSUBSCRIBE. This includes PPR, > where the pattern would be terminated by another colon to separate it from > the > modifiers. > > Is it an acronym/initialism? From some experimenting it seems to be > ppr:2:socket means 2 processes per socket? And pe=7 means leave 7 processes > between them? Is that about right? > > Matt > > On Wed, Jan 6, 2016 at 3:19 PM, Ralph Castain <r...@open-mpi.org > <mailto:r...@open-mpi.org>> wrote: > I believe he wants two procs/socket, so you’d need ppr:2:socket:pe=7 > > >> On Jan 6, 2016, at 12:14 PM, Nick Papior <nickpap...@gmail.com >> <mailto:nickpap...@gmail.com>> wrote: >> >> I do not think KMP_AFFINITY should affect anything in OpenMPI, it is an MKL >> env setting? Or am I wrong? >> >> Note that these are used in an environment where openmpi automatically gets >> the host-file. Hence they are not present. >> With intel mkl and openmpi I got the best performance using these, rather >> long flags: >> >> export KMP_AFFINITY=verbose,compact,granularity=core >> export KMP_STACKSIZE=62M >> export KMP_SETTINGS=1 >> >> def_flags="--bind-to core -x OMP_PROC_BIND=true --report-bindings" >> def_flags="$def_flags -x KMP_AFFINITY=$KMP_AFFINITY" >> >> # in your case 7: >> ONP=7 >> flags="$def_flags -x MKL_NUM_THREADS=$ONP -x MKL_DYNAMIC=FALSE" >> flags="$flags -x OMP_NUM_THREADS=$ONP -x OMP_DYNAMIC=FALSE" >> flags="$flags -x KMP_STACKSIZE=$KMP_STACKSIZE" >> flags="$flags --map-by ppr:1:socket:pe=7" >> >> then run your program: >> >> mpirun $flags <app> >> >> A lot of the option flags are duplicated (and strictly not needed), but I >> provide them for easy testing changes. >> Surely this is application dependent, but for my case it was performing >> really well. >> >> >> 2016-01-06 20:48 GMT+01:00 Erik Schnetter <schnet...@gmail.com >> <mailto:schnet...@gmail.com>>: >> Setting KMP_AFFINITY will probably override anything that OpenMPI >> sets. Can you try without? >> >> -erik >> >> On Wed, Jan 6, 2016 at 2:46 PM, Matt Thompson <fort...@gmail.com >> <mailto:fort...@gmail.com>> wrote: >> > Hello Open MPI Gurus, >> > >> > As I explore MPI-OpenMP hybrid codes, I'm trying to figure out how to do >> > things to get the same behavior in various stacks. For example, I have a >> > 28-core node (2 14-core Haswells), and I'd like to run 4 MPI processes and >> > 7 >> > OpenMP threads. Thus, I'd like the processes to be 2 processes per socket >> > with the OpenMP threads laid out on them. Using a "hybrid Hello World" >> > program, I can achieve this with Intel MPI (after a lot of testing): >> > >> > (1097) $ env OMP_NUM_THREADS=7 KMP_AFFINITY=compact mpirun -np 4 >> > ./hello-hybrid.x | sort -g -k 18 >> > srun.slurm: cluster configuration lacks support for cpu binding >> > Hello from thread 0 out of 7 from process 2 out of 4 on borgo035 on CPU 0 >> > Hello from thread 1 out of 7 from process 2 out of 4 on borgo035 on CPU 1 >> > Hello from thread 2 out of 7 from process 2 out of 4 on borgo035 on CPU 2 >> > Hello from thread 3 out of 7 from process 2 out of 4 on borgo035 on CPU 3 >> > Hello from thread 4 out of 7 from process 2 out of 4 on borgo035 on CPU 4 >> > Hello from thread 5 out of 7 from process 2 out of 4 on borgo035 on CPU 5 >> > Hello from thread 6 out of 7 from process 2 out of 4 on borgo035 on CPU 6 >> > Hello from thread 0 out of 7 from process 3 out of 4 on borgo035 on CPU 7 >> > Hello from thread 1 out of 7 from process 3 out of 4 on borgo035 on CPU 8 >> > Hello from thread 2 out of 7 from process 3 out of 4 on borgo035 on CPU 9 >> > Hello from thread 3 out of 7 from process 3 out of 4 on borgo035 on CPU 10 >> > Hello from thread 4 out of 7 from process 3 out of 4 on borgo035 on CPU 11 >> > Hello from thread 5 out of 7 from process 3 out of 4 on borgo035 on CPU 12 >> > Hello from thread 6 out of 7 from process 3 out of 4 on borgo035 on CPU 13 >> > Hello from thread 0 out of 7 from process 0 out of 4 on borgo035 on CPU 14 >> > Hello from thread 1 out of 7 from process 0 out of 4 on borgo035 on CPU 15 >> > Hello from thread 2 out of 7 from process 0 out of 4 on borgo035 on CPU 16 >> > Hello from thread 3 out of 7 from process 0 out of 4 on borgo035 on CPU 17 >> > Hello from thread 4 out of 7 from process 0 out of 4 on borgo035 on CPU 18 >> > Hello from thread 5 out of 7 from process 0 out of 4 on borgo035 on CPU 19 >> > Hello from thread 6 out of 7 from process 0 out of 4 on borgo035 on CPU 20 >> > Hello from thread 0 out of 7 from process 1 out of 4 on borgo035 on CPU 21 >> > Hello from thread 1 out of 7 from process 1 out of 4 on borgo035 on CPU 22 >> > Hello from thread 2 out of 7 from process 1 out of 4 on borgo035 on CPU 23 >> > Hello from thread 3 out of 7 from process 1 out of 4 on borgo035 on CPU 24 >> > Hello from thread 4 out of 7 from process 1 out of 4 on borgo035 on CPU 25 >> > Hello from thread 5 out of 7 from process 1 out of 4 on borgo035 on CPU 26 >> > Hello from thread 6 out of 7 from process 1 out of 4 on borgo035 on CPU 27 >> > >> > Other than the odd fact that Process #0 seemed to start on Socket #1 (this >> > might be an artifact of how I'm trying to detect the CPU I'm on), this >> > looks >> > reasonable. 14 threads on each socket and each process is laying out its >> > threads in a nice orderly fashion. >> > >> > I'm trying to figure out how to do this with Open MPI (version 1.10.0) and >> > apparently I am just not quite good enough to figure it out. The closest >> > I've gotten is: >> > >> > (1155) $ env OMP_NUM_THREADS=7 KMP_AFFINITY=compact mpirun -np 4 -map-by >> > ppr:2:socket ./hello-hybrid.x | sort -g -k 18 >> > Hello from thread 0 out of 7 from process 0 out of 4 on borgo035 on CPU 0 >> > Hello from thread 0 out of 7 from process 1 out of 4 on borgo035 on CPU 0 >> > Hello from thread 1 out of 7 from process 0 out of 4 on borgo035 on CPU 1 >> > Hello from thread 1 out of 7 from process 1 out of 4 on borgo035 on CPU 1 >> > Hello from thread 2 out of 7 from process 0 out of 4 on borgo035 on CPU 2 >> > Hello from thread 2 out of 7 from process 1 out of 4 on borgo035 on CPU 2 >> > Hello from thread 3 out of 7 from process 0 out of 4 on borgo035 on CPU 3 >> > Hello from thread 3 out of 7 from process 1 out of 4 on borgo035 on CPU 3 >> > Hello from thread 4 out of 7 from process 0 out of 4 on borgo035 on CPU 4 >> > Hello from thread 4 out of 7 from process 1 out of 4 on borgo035 on CPU 4 >> > Hello from thread 5 out of 7 from process 0 out of 4 on borgo035 on CPU 5 >> > Hello from thread 5 out of 7 from process 1 out of 4 on borgo035 on CPU 5 >> > Hello from thread 6 out of 7 from process 0 out of 4 on borgo035 on CPU 6 >> > Hello from thread 6 out of 7 from process 1 out of 4 on borgo035 on CPU 6 >> > Hello from thread 0 out of 7 from process 2 out of 4 on borgo035 on CPU 14 >> > Hello from thread 0 out of 7 from process 3 out of 4 on borgo035 on CPU 14 >> > Hello from thread 1 out of 7 from process 2 out of 4 on borgo035 on CPU 15 >> > Hello from thread 1 out of 7 from process 3 out of 4 on borgo035 on CPU 15 >> > Hello from thread 2 out of 7 from process 2 out of 4 on borgo035 on CPU 16 >> > Hello from thread 2 out of 7 from process 3 out of 4 on borgo035 on CPU 16 >> > Hello from thread 3 out of 7 from process 2 out of 4 on borgo035 on CPU 17 >> > Hello from thread 3 out of 7 from process 3 out of 4 on borgo035 on CPU 17 >> > Hello from thread 4 out of 7 from process 2 out of 4 on borgo035 on CPU 18 >> > Hello from thread 4 out of 7 from process 3 out of 4 on borgo035 on CPU 18 >> > Hello from thread 5 out of 7 from process 2 out of 4 on borgo035 on CPU 19 >> > Hello from thread 5 out of 7 from process 3 out of 4 on borgo035 on CPU 19 >> > Hello from thread 6 out of 7 from process 2 out of 4 on borgo035 on CPU 20 >> > Hello from thread 6 out of 7 from process 3 out of 4 on borgo035 on CPU 20 >> > >> > Obviously not right. Any ideas on how to help me learn? The man mpirun page >> > is a bit formidable in the pinning part, so maybe I've missed an obvious >> > answer. >> > >> > Matt >> > -- >> > Matt Thompson >> > >> > Man Among Men >> > Fulcrum of History >> > >> > >> > _______________________________________________ >> > users mailing list >> > us...@open-mpi.org <mailto:us...@open-mpi.org> >> > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >> > <http://www.open-mpi.org/mailman/listinfo.cgi/users> >> > Link to this post: >> > http://www.open-mpi.org/community/lists/users/2016/01/28217.php >> > <http://www.open-mpi.org/community/lists/users/2016/01/28217.php> >> >> >> >> -- >> Erik Schnetter <schnet...@gmail.com <mailto:schnet...@gmail.com>> >> http://www.perimeterinstitute.ca/personal/eschnetter/ >> <http://www.perimeterinstitute.ca/personal/eschnetter/> >> _______________________________________________ >> users mailing list >> us...@open-mpi.org <mailto:us...@open-mpi.org> >> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >> <http://www.open-mpi.org/mailman/listinfo.cgi/users> >> Link to this post: >> http://www.open-mpi.org/community/lists/users/2016/01/28218.php >> <http://www.open-mpi.org/community/lists/users/2016/01/28218.php> >> >> >> >> -- >> Kind regards Nick >> _______________________________________________ >> users mailing list >> us...@open-mpi.org <mailto:us...@open-mpi.org> >> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >> <http://www.open-mpi.org/mailman/listinfo.cgi/users> >> Link to this post: >> http://www.open-mpi.org/community/lists/users/2016/01/28219.php >> <http://www.open-mpi.org/community/lists/users/2016/01/28219.php> > > _______________________________________________ > users mailing list > us...@open-mpi.org <mailto:us...@open-mpi.org> > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > <http://www.open-mpi.org/mailman/listinfo.cgi/users> > Link to this post: > http://www.open-mpi.org/community/lists/users/2016/01/28221.php > <http://www.open-mpi.org/community/lists/users/2016/01/28221.php> > > > > -- > Matt Thompson > Man Among Men > Fulcrum of History > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2016/01/28223.php
