Hi, Thanks for the information.I got understanding like openmpi is a library not a tool like qperf,correct me if i am wrong.If it is a tool,explain me how to run it.
On Fri, Sep 2, 2011 at 5:13 PM, Jeff Squyres <jsquy...@cisco.com> wrote: > If I understand you correctly, it sounds like MPI -- overall -- is new to > you. > > If that's the case, here's the 2 minute overview: MPI is communications > middleware, typically used for parallel applications. MPI, as an API, is > underlying-network-agnostic; hence, it can be used with TCP sockets, > ethernet, OpenFabrics-based networks, etc., without the upper-layer > application being aware of the differences between these networks. > > There's lots of MPI-based applications out there, including bunches of > benchmarks and tests. You might want to get the Intel MPI Benchmarks (aka > "IMB") and compile and run those with Open MPI over your modified OFED > stack. The IMB are sufficiently complex, and MPI implementations themselves > are sufficiently complex and different from each other that running IMB with > 4 or 8 processes will exercise your OFED stack in many different ways; > that's probably why MPI was recommended to you. > > The two big open source MPI implementations -- Open MPI and MPICH2 -- both > come with "wrapper" compilers (mpicc, mpic++, mpf77, mpif90, ...etc.) that > add all the relevant compiler/linker flags to the command line to > compile/link your application. Hence, in Makefiles, you can typically > remove all MPI-inspired references to -I, -L, and -l and just use the > wrapper compilers. For example: > > mpicc -c foo.c > mpicc -c bar.c > mpicc foo.o bar.o -o my_mpi_application > > You then use "mpirun" to launch your application in parallel. For example: > > mpirun -np 8 --hostfile my_hostfile my_mpi_application > > See the mpirun(1) for more details, and the FAQ. Each MPI implementation's > mpirun is typically different than the others (e.g., Open MPI's mpirun has > different CLI options than MPICH2's mpirun). > > Open MPI also allows the concept of run-time customization of the > underlying MPI processing engine via "MCA" parameters. You can pass MCA > params via the command line, environment, or files (see the FAQ). Open MPI > should probably pick the OpenFabrics-based transport by default on your > machines, but just to be sure, you can force the use of the "openib" BTL > (byte transport layer) in Open MPI thusly: > > mpirun -np 8 --hostfile my_hostfile --mca btl openib,sm,self > my_mpi_application > > openib = OFED-based transport (for MPI procs on remote servers) > sm = shared memory-based transport (for MPI procs on the same server) > self = process loopback > > That should be enough to get you going; good luck. > > > > On Sep 2, 2011, at 7:17 AM, bhimesh akula wrote: > > > Hi , > > > > We developed new OFED stack as for our requirements to our new > product.Now it is needed to check the functionality of new OFED stack using > MPI,used multi node setup to check this stack.But problem is we are not > having no idea how to use OPEN-MPI tool to check our stack.I went through > this site "http://www.open-mpi.org/",here only mentioned how to run MPI > applications but we need our new stack has to be checked using MPI. > > > > As we checked our new stack using qperf tool but MPI is more recommended > .Want to know how to run MPI as how we used qperf. we used qperf like "at > one node running qperf as server and running qperf at other node as > client,ran all the qperf test cases from client to see the functionality and > performance of OFED".Like this how we can use OPEN-MPI tool to test the new > stack. > > > > I think problem conveyed well,please get back to me on this as soon as > possible. > > > > Thanks & regards, > > Punya Bhimesh. > > _______________________________________________ > > users mailing list > > us...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/users > > > -- > Jeff Squyres > jsquy...@cisco.com > For corporate legal information go to: > http://www.cisco.com/web/about/doing_business/legal/cri/ > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
