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Add caveat about changing parallelism and function call overhead #90198

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Oct 23, 2021
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Add caveat about changing parallelism and function call overhead #90198

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4 changes: 4 additions & 0 deletions library/std/src/thread/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1449,6 +1449,10 @@ fn _assert_sync_and_send() {
/// global state in order to more accurately query the amount of available
/// parallelism.
///
/// Resource limits can be changed during the runtime of a program, therefore the value is
/// not cached and instead recomputed every time this function is called. It should not be
/// called from hot code.
///
/// The value returned by this function should be considered a simplified
/// approximation of the actual amount of parallelism available at any given
/// time. To get a more detailed or precise overview of the amount of
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