Use -O1 for sleef build in Debug mode #11942
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jamesr66a
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apaszke,
colesbury,
ezyang,
gchanan,
soumith and
zdevito
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This seems like a very good idea. I think we may want to do the same thing for everything in |
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@colesbury - this should include that, no? |
orionr
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Sep 21, 2018
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Summary: `-O0` is problematic for compiling sleef kernels since they consist of a bunch of vector intrinsics. In `-O0`, the compiler spills *every* intermediate value to the stack. In one example (TestEndToEndHybridFrontendModels.test_snli in test_jit.py) the function `Sleef_tanhf8_u10avx2` would spill 30kB of AVX registers onto the stack and run two orders of magnitude slower than in opt mode, causing the test to take minutes rather than seconds. I've verified that this behavior is not present with `-O1` Pull Request resolved: pytorch/pytorch#11942 Differential Revision: D9994658 Pulled By: jamesr66a fbshipit-source-id: cdd9474c6ae3aa9898d5715ac19a900f5f90468a
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-O0is problematic for compiling sleef kernels since they consist of a bunch of vector intrinsics. In-O0, the compiler spills every intermediate value to the stack. In one example (TestEndToEndHybridFrontendModels.test_snli in test_jit.py) the functionSleef_tanhf8_u10avx2would spill 30kB of AVX registers onto the stack and run two orders of magnitude slower than in opt mode, causing the test to take minutes rather than seconds. I've verified that this behavior is not present with-O1