Fantastic, Gus! Now I think I got framework pretty much done. The rest is to work on 'problem solving' end with R.
Many thanks for your insight and kindness. I really appreciate it. Regards, Tena Sakai tsa...@gallo.ucsf.edu On 1/13/11 2:40 PM, "Gus Correa" <g...@ldeo.columbia.edu> wrote: > 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 ³rfib 5² on node >> 0, ³rfib 6² >> on node 1, ³rfib 7² 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 > --------------------------------------------------------------------- > Gustavo Correa > Lamont-Doherty Earth Observatory - Columbia University > Palisades, NY, 10964-8000 - USA > --------------------------------------------------------------------- > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users