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Pinned topic Parallel Job Tuning

‏2013-07-23T21:57:39Z | parallel parameterizer partitioning threads tuning
Has anyone successfully parallelized a job?
I have a job that runs with multiple sub jobs but the job's throughput does not increase.  That is, no matter how many sub jobs there are, the total number records processed per unit of time never increases.  Basically, it looks like only one thread is being used by WAS to serve all sub jobs.
So my question is, if you have successfully parallelized a job, do you have to modify your WAS configuration as well?