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Up to 7% regression in recent rollup #57115

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Up to 7% regression in recent rollup#57115
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I-compilememIssue: Problems and improvements with respect to memory usage during compilation.I-compiletimeIssue: Problems and improvements with respect to compile times.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.
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@alexcrichton
alexcrichton
opened on Dec 25, 2018

Noticed here it looks like something in that rollup has caused a blanket regression in compile time instruction counts while also simultaneously improving memory. The current hypothesis is that #56986 is incorrect and disabled jemalloc entirely.

Another hypothesis is that #56944 had a really weird effect on the build.

In any case, we should investigate!

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    I-compilememIssue: Problems and improvements with respect to memory usage during compilation.I-compiletimeIssue: Problems and improvements with respect to compile times.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.

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