I would recommend using the sequential mapper instead: mpirun -mca rmaps seq
You can then just list your hosts in your hostfile, and we will put the ranks sequentially on those hosts. So you get something like this host01 <= rank0 host01 <= rank1 host02 <= rank2 host03 <= rank3 host01 <= rank4 Ralph On Jun 9, 2010, at 4:39 AM, Grzegorz Maj wrote: > In my previous mail I said that slot=0-3 would be a solution. > Unfortunately it gives me exactly the same segfault as in case with > *:* > > 2010/6/9 Grzegorz Maj <ma...@wp.pl>: >> Hi, >> I'd like mpirun to run tasks with specific ranks on specific hosts, >> but I don't want to provide any particular sockets/slots/cores. >> The following example uses just one host, but generally I'll use more. >> In my hostfile I just have: >> >> root@host01 slots=4 >> >> I was playing with my rankfile to achieve what I've mentioned, but I >> always get some problems. >> >> 1) With rankfile like: >> rank 0=host01 slot=* >> rank 1=host01 slot=* >> rank 2=host01 slot=* >> rank 3=host01 slot=* >> >> I get: >> >> -------------------------------------------------------------------------- >> We were unable to successfully process/set the requested processor >> affinity settings: >> >> Specified slot list: * >> Error: Error >> >> This could mean that a non-existent processor was specified, or >> that the specification had improper syntax. >> -------------------------------------------------------------------------- >> -------------------------------------------------------------------------- >> mpirun was unable to start the specified application as it encountered an >> error: >> >> Error name: Error >> Node: host01 >> >> when attempting to start process rank 0. >> -------------------------------------------------------------------------- >> [host01:13715] Rank 0: PAFFINITY cannot get physical processor id for >> logical processor 4 >> >> >> I think it tries to find processor #4, bug there are only 0-3 >> >> 2) With rankfile like: >> rank 0=host01 slot=*:* >> rank 1=host01 slot=*:* >> rank 2=host01 slot=*:* >> rank 3=host01 slot=*:* >> >> Everything looks well, i.e. my programs are spread across 4 processors. >> But when running MPI program as follows: >> >> MPI::Init(argc, argv); >> fprintf(stderr, "after init %d\n", MPI::Is_initialized()); >> nprocs_mpi = MPI::COMM_WORLD.Get_size(); >> fprintf(stderr, "won't get here\n"); >> >> I get: >> >> after init 1 >> [host01:14348] *** Process received signal *** >> [host01:14348] Signal: Segmentation fault (11) >> [host01:14348] Signal code: Address not mapped (1) >> [host01:14348] Failing at address: 0x8 >> [host01:14348] [ 0] [0xffffe410] >> [host01:14348] [ 1] p(_ZNK3MPI4Comm8Get_sizeEv+0x19) [0x8051299] >> [host01:14348] [ 2] p(main+0x86) [0x804ee4e] >> [host01:14348] [ 3] /lib/libc.so.6(__libc_start_main+0xe5) [0x4180b5c5] >> [host01:14348] [ 4] p(__gxx_personality_v0+0x125) [0x804ecc1] >> [host01:14348] *** End of error message *** >> >> I'm using OPEN MPI v. 1.4.2 (downloaded yesterday). >> In my rankfile I really want to write something like slot=*. I know >> slot=0-3 would be a solution, but when generating rankfile I may not >> be sure how many processors are there available on a particular host. >> >> Any help would be appreciated. >> >> Regards, >> Grzegorz Maj >> > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
