Folks, the intercomm_create test case from the ibm test suite can hang under some configuration.
basically, it will spawn n tasks in a first communicator, and then n tasks in a second communicator. when i run from node0 : mpirun -np 1 --mca btl tcp,self --mca coll ^ml -host node1,node2 ./intercomm_create the second spawn will hang. a simple workaround is to use 3 hosts : mpirun -np 1 --mca btl tcp,self --mca coll ^ml -host node1,node2,node3 ./intercomm_create the second spawn creates the task on node2. for some reasons i cannot fully understand, pmix believe orted of nodes node1 and node2 are involved in allgather. since node1 in not involved whatsoever, the program hangs /* in create_dmns, orte_get_job_data_object(sig->signature[0].jobid) returns jdata with jdata->map->num_nodes = 2 */ Cheers, Gilles
