Optimize and fix time::precise_time_ns() on macos #14216
Merged
+20
−5
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
r=me, but mk/crates.mk should be updated with the new dependency on sync as well |
Use sync::one::Once to fetch the mach_timebase_info only once when running precise_time_ns(). This helps because mach_timebase_info() is surprisingly inefficient. Also fix the order of operations when applying the timebase to the mach absolute time value. This improves the time on my machine from ``` test tests::bench_precise_time_ns ... bench: 157 ns/iter (+/- 4) ``` to ``` test tests::bench_precise_time_ns ... bench: 38 ns/iter (+/- 3) ``` and it will get even faster once rust-lang#14174 lands.
bors
added a commit
that referenced
this pull request
May 16, 2014
…chton Use sync::one::Once to fetch the mach_timebase_info only once when running precise_time_ns(). This helps because mach_timebase_info() is surprisingly inefficient. Also fix the order of operations when applying the timebase to the mach absolute time value. This improves the time on my machine from ``` test tests::bench_precise_time_ns ... bench: 157 ns/iter (+/- 4) ``` to ``` test tests::bench_precise_time_ns ... bench: 38 ns/iter (+/- 3) ``` and it will get even faster once #14174 lands.
lnicola
pushed a commit
to lnicola/rust
that referenced
this pull request
Mar 13, 2023
minor: Simplify
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Use sync::one::Once to fetch the mach_timebase_info only once when
running precise_time_ns(). This helps because mach_timebase_info() is
surprisingly inefficient. Also fix the order of operations when applying
the timebase to the mach absolute time value.
This improves the time on my machine from
to
and it will get even faster once #14174 lands.