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
