[FIX] peakfit: limit multiprocessing to 2 processes during fitting to avoid crashes #748
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Fixes #743
Can be overridden with new env var
QUASAR_N_PROCESSES=all
Documented in the widget documentation. We can move it later if we use it more places.
I was going to add tests* but it seems
unittest
always gives youcpu_count()==1
(so that part works at least) and mocking environment variables inunittest
is annoying.Edit: I did test the permutations on a large multicore machine