Speed up parallelized CI #378
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status:awaiting review
SamWitty
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Nov 14, 2023
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This PR adds
MKL_NUM_THREADS=1to the unit test run in our CI workflow. This environment variable restricts the maximum number of CPU threads that an Intel MKL implementation of a tensor operation can use. When running many small PyTorch computations in parallel processes on an Intel CPU, operation-level parallelism within kernels can interfere with process-level parallelism, resulting in significant slowdowns compared to executing operation kernels within the process that invoked them. This tweak seems to have reduced our unit test CI times by ~25%.