[mpich-discuss] separate working directory for each process
zstanko at usgs.gov
Fri Aug 17 18:44:22 CDT 2012
My application does not run because each process is trying to ope the
same output file. How can I specify a separate working directory for each
process so there is no conflict.
Something like: mpiexec -n 1 myapp inp-file : -n 1 -dir c:\temp\scratch1 :
-n 1 -dir c:\temp\scratch2 : -n 1 -dir c:\temp\scratch3
The application is an optimization that only needs to run on the host
machine. The three workers (different cores on the same machine) only need
to evaluate a simulation model embedded in the application.
The simulation model, however, needs to produce an output file whose name
cannot be changed so I just want it to be output to a different directory
for each worker.
Is the first process always going to be the master with rank 0?
Do I need a copy of the application and input file in each of the working
If I added myapp inp-file to each of the worker commands, would the whole
application just run separately on all four processors or would they sync
up and know that the workers only have a specific task?
mpiexec -n 1 myapp inp-file : -n 1 -dir c:\temp\scratch1 myapp inp-file:
-n 1 -dir c:\temp\scratch2 myapp inp-file: -n 1 -dir c:\temp\scratch3
I have tried this latter option with both 3 and 6 workers (I am running on
an eight core processor) but do not seem to be getting any speedup so I'm
wondering if I am doing this wrong.
Thank you for your time,
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