JobRunner: enable slots/cores/threads to be set within runners#152
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…, to emulate parallel (multicore) jobs.
…s etc) to be specified via 'nslots' option on 'SimpleJobRunner'.
… slots, CPUs etc) when running jobs.
…or SimpleJobRunner.
…for multicore jobs.
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PR which enables the number of available threads or cores to be set and accessed from job runners.
For
SimpleJobRunnerinstances, thenslotsoption can be set to specify the number of available cores; forGEJobRunnerinstances the number of available cores is determined at run time from theNSLOTSenvironment variable. Both runners set aBCFTBX_RUNNER_NSLOTSenvironment variable so that processes run by the runners can access and use this number if required.