In a similar situation i wrote a simple shell script "rankcreate.sh"
which creates a rank file assigning the various ranks to the correct
processors/slots when given a number of processes. In addition, this
script returns the name of this created rank file. I then use it like
this:
mpirun -np 5
David Mathog wrote:
Also, in my limited testing --host and -hostfile seem to be mutually
exclusive.
No. You can use both together. Indeed, the mpirun man page even has
examples of this (though personally, I don't see having a use for
this). I think the idea was you might use a hostfile to
Terry is correct - not guaranteed, but that is the typical behavior.
However, you -can- guarantee that rank=0 will be on a particular host. Just run
your job:
mpirun -n 1 -host my_app : -n (N-1) my_app
This guarantees that rank=0 is on host . All other ranks will be
distributed according to
On 12/10/2010 01:46 PM, David Mathog wrote:
The master is commonly very different from the workers, so I expected
there would be something like
--rank0-on
but there doesn't seem to be a single switch on mpirun to do that.
If "mastermachine" is the first entry in the hostfile, or the first
The master is commonly very different from the workers, so I expected
there would be something like
--rank0-on
but there doesn't seem to be a single switch on mpirun to do that.
If "mastermachine" is the first entry in the hostfile, or the first
machine in a -hosts list, will rank 0 always
