Limit of 'parallel' jobs

[ok999]

Any documented and tested limits on the number of parallel that can be executed in a slave. Will it also go by the thumb rule of number of cores in the CPU?

[John Mellor]

There can never be a reasonable number quoted.  It all depends upon the number of threads that your build job uses, how disk-bound or network-bound each job is, how overloaded the VM host machine is, how much spare RAM is available, etc.

 

I myself have a large number of C++ jobs using gmake –j, so all processors are inherently utilized on the slave machine.  Consequently, I always limit the number of executors to one.

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[ok999]

the question was not for the # of executors. It more for the parallel task execution in the jenkins pipeline.