ensure threading is disabled where not allowed #780
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It seems like threading might not be allowed/expected on 1.9+ in some of these stages, which was causing #778.
@vtjnash is that right?
This fixes/patches #778 in cases where the user has
JULIA_NUM_THREADS
set to > 1Testing locally, this fixes it in the sense that CPU load goes down to 100% per precompile task.
However, precompilation still takes a lot longer than it should. It seems like the 1 active thread is spinning or something