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Task Farming on HPCx
Basically, in your LoadLeveler script you do something like:
taskfarm "echo hello from %d"
(quotes aren't necessary here). Each process executes the command with %d replaced by its own process id, so if you specify 3 CPUs in the your LoadLeveler script and run the above you should get output like:
hello from 0 hello from 1 hello from 2In practice you want each executable to read different input files and write to different output, so you would do something like:
taskfarm "cd rundir%d; serialjob < input > output.log"or
taskfarm "serialjob< input.%d > output.%d.log"(here the quotes ARE necessary).
The only option is "-v" for verbose in case you want to debug, eg on 3 processes:
taskfarm -v "echo hello from %d" taskfarm: called with 4 arguments: echo hello from %d taskfarm: process 0 executing "echo hello from 0" taskfarm: process 1 executing "echo hello from 1" taskfarm: process 2 executing "echo hello from 2" hello from 0 hello from 1 hello from 2 taskfarm: return code on process 0 is 0 taskfarm: return code on process 1 is 0 taskfarm: return code on process 2 is 0I hope that this is useful!
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