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Merge branch 'trunk' into improve-dependency-solving

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Richard Feldman 2020-10-12 10:23:53 -04:00 • committed by GitHub
commit a3d81108c3
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6 changed files with 37 additions and 11 deletions
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11
compiler/load/src/file.rs
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@ -823,8 +823,15 @@ fn load<'a>(
where
{
// Reserve one CPU for the main thread, and let all the others be eligible
// to spawn workers.
let num_workers = num_cpus::get() - 1;
// to spawn workers. We use .max(2) to enforce that we always
// end up with at least 1 worker - since (.max(2) - 1) will
// always return a number that's at least 1. Using
// .max(2) on the initial number of CPUs instead of
// doing .max(1) on the entire expression guards against
// num_cpus returning 0, while also avoiding wrapping
// unsigned subtraction overflow.
let num_workers = num_cpus::get().max(2) - 1;
let worker_arenas = arena.alloc(bumpalo::collections::Vec::with_capacity_in(
num_workers,
arena,