hostname never calls MPI_Init, and therefore never initializes the BTL
subsystem. Therefore, hostname will always run correctly.
mpirun is not an MPI process, nor are the daemons used by OMPI to
launch the MPI job. Thus, they also do not call MPI_Init, and
therefore do not see the BTL subsystem.
So this example will run just fine. You need to run an MPI application
to cause it to fail.
Ralph
On Apr 8, 2009, at 10:15 PM, Robert Kubrick wrote:
How is this possible?
dx:~> mpirun -v -np 2 --mca btl self,sm --host dx,sx hostname
dx
sx
dx:~> netstat -i
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP
TX-OVR Flg
eth0 1500 0 998755 0 0 0 1070323 0
0 0 BMRU
eth1 1500 0 85352 0 0 0 379993 0
0 0 BMRU
ib0 65520 0 204 0 0 0 155 0
5 0 BMRU
lo 16436 0 1648874 0 0 0 1648874 0
0 0 LRU
I want to force an error with the first command above to make sure
that my btl parameters are used correctly, but it looks like ompi
runs hostname on the remote machine regardless.
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