Most message passing libraries that I've worked with use command line arguments (that get filtered out in MPI_Init) to pass in information to the started jobs. You could have a check for 'strange' command line arguments.
Mattijs On Monday 20 October 2008 23:40, Adams, Brian M wrote: > I work on an application (DAKOTA) that has opted for single binaries with > source code to detect serial vs. MPI execution at run-time. While I > realize there are many other ways to handle this (wrapper scripts, > command-line switches, different binaries for serial vs. MPI, etc.), I'm > looking for a reliable way to detect (in source) whether a binary has been > launched in serial or with orterun. > > We typically do this via detecting environment variables, so the easiest > path for me would be to know an environment variable present when an > application is invoked with orterun that is not typically present outside > that MPI runtime environment. Some candidates that came up in my > particular environment include the following, but I don't know if any is a > safe bet: > > OMPI_MCA_gpr_replica_uri > OMPI_MCA_mpi_paffinity_processor > OMPI_MCA_mpi_yield_when_idle > OMPI_MCA_ns_nds > OMPI_MCA_ns_nds_cellid > OMPI_MCA_ns_nds_jobid > OMPI_MCA_ns_nds_num_procs > OMPI_MCA_ns_nds_vpid > OMPI_MCA_ns_nds_vpid_start > OMPI_MCA_ns_replica_uri > OMPI_MCA_orte_app_num > OMPI_MCA_orte_base_nodename > OMPI_MCA_orte_precondition_transports > OMPI_MCA_pls > OMPI_MCA_ras > OMPI_MCA_rds > OMPI_MCA_rmaps > OMPI_MCA_rmgr > OMPI_MCA_universe > > I'd also welcome suggestions for other in-source tests that might reliably > detect run via orterun. Thanks! > > Brian > ---------- > Brian M. Adams, PhD (bria...@sandia.gov) > Optimization and Uncertainty Estimation > Sandia National Laboratories, Albuquerque, NM > http://www.sandia.gov/~briadam -- Mattijs Janssens OpenCFD Ltd. 9 Albert Road, Caversham, Reading RG4 7AN. Tel: +44 (0)118 9471030 Email: m.janss...@opencfd.co.uk URL: http://www.OpenCFD.co.uk
