Tena Sakai wrote:
Hi,
I have a script I call fib.r. It looks like:
#!/usr/bin/env r
fib <- function( n ) {
a <- 0
b <- 1
for ( i in 1:n ) {
t <- b
b <- a
a <- a + t
}
a
}
print( fib(argv[1]) )
When I run this script with a parameter, it generates a fibonocci number:
$ fib.r 5
5
$ fib.r 6
8
and if I stick this into <program> part of MIMD example I have used
previously:
$ mpirun -H vixen -np 1 hostname : --hostfile myhosts -np 8 fib.r 7
I get:
vixen.egcrc.org
[1] 13
[1] 13
[1] 13
[1] 13
[1] 13
[1] 13
[1] 13
[1] 13
This is good as proof of concept, but what I really want to do is to
have that 7
different for each (slave) process. Ie., I want to run “rfib 5” on node
0, “rfib 6”
on node 1, “rfib 7” on node 2, and so on. Is there any way to give a
different
parameter(s) to different process/slot?
I thought maybe I can use –rf option to do this, but I am leaning toward
–app
option. Unfortunately, I see no example for the application context
file. Would
someone kindly explain how I can do what I describe?
Thank you.
Tena Sakai
tsa...@gallo.ucsf.edu
Hi Tena
We ran MPMD/MIMD programs here using in the past.
Coupled climate modes: atmosphere, ocean, sea ice, etc, each one one
executable, communicating via MPI.
Actually this was with MPICH1, somewhat different syntax than OpenMPI,
the flag/file was called '-pgfile' not '-app',
but I see no reason why it shouldn't work in your case with OpenMPI.
I think if you create a 'appfile' with this content:
-H node0 -np 1 rfib 5
-H node0 -np 1 rfib 6
...
and launch mpirun with
mpirun -app appfile
it is likely to work.
Under Torque I cannot test this very easily,
because I need to parse the Torque file that gives me the nodes,
then write down the 'appfile' on the fly (which is what I used to
do for the coupled climate models).
However, I tried on a standalone machine (where the -H nodename didn't
make sense, and was not used) and it worked.
My appfile test was like this:
-np 1 ls appfile
-np 1 hostname
-np 2 date
-np 4 who
You can add your -H nodename to each line.
I hope this helps,
Gus Correa
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Gustavo Correa
Lamont-Doherty Earth Observatory - Columbia University
Palisades, NY, 10964-8000 - USA
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