Change the amout of threads used for a computation

It seems like IVM is using all threads available on a machine per default. When sharing resources on a cluster with multiple users this is not something that you want, because different jobs would have to fight for the same cores.

Is there a way to change this behavior? The amount of threads used does not seem to be related to julia-multithreading or blas.

No file, test, or entry point is identified in the issue. Start by reproducing IVM's default thread usage on a shared machine and trace whether it is controlled outside Julia multithreading and BLAS; done means a documented way to limit the computation's threads independently.

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