Hi Jeff, Thank you very much for your help!
I tried to run the same test of ring_c from standard examples in Open MPI 1.4.3 distribution. If I ran as you described from the command line, it worked without any problem with sm btl included(with --mca btl self,sm,openib). However, if I use sm btl(with --mca btl self,sm,openib), and ran ring_c from an in-house script, it showed the same issue as I described in my previous email, it will hang at MPI_Init(...) call. I think this issue is related to some environmental setting in the script. Do you have any hints, any prerequisite of system environmental configuration to work with sm btl layer in Open MPI? Thanks again, Yiguang
