perf: make truncate 4x faster in simple cases #16615
Merged
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
github-actions
bot
added
performance
4 tasks
ritchie46
reviewed
May 31, 2024
crates/polars-time/src/truncate.rs
Outdated
| let offset: Duration = Duration::parse(offset); | ||
| let time_zone = self.time_zone(); | ||
| // A sqrt(n) cache is not too small, not too large. | ||
| let mut duration_cache = FastFixedCache::new((every.len() as f64).sqrt() as usize); |
There was a problem hiding this comment.
Can we allocate the cache below the fast path. The fast path only accesses the cache (and misses) once.
ritchie46
reviewed
May 31, 2024
| && (every.months() == 0 && every.weeks() == 0) | ||
| { | ||
| // ... yes we can! Weeks, months, and time zones require extra logic. | ||
| // But in this simple case, it's just simple integer arithmetic. |
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #16615 +/- ##
==========================================
- Coverage 81.51% 81.51% -0.01%
==========================================
Files 1414 1414
Lines 185906 185940 +34
Branches 3027 3027
==========================================
+ Hits 151535 151561 +26
- Misses 33840 33848 +8
Partials 531 531 ☔ View full report in Codecov by Sentry. |
ritchie46
approved these changes
May 31, 2024
2 tasks
Wouittone
pushed a commit
to Wouittone/polars
that referenced
this pull request
Jun 22, 2024
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Outdated suggestions cannot be applied.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.
closes #16531
This introduces a fastpath for the simplest case
I think the non-simple case can also be optimised, but that's a separate task. I've made a tracker: #16617. I'll work on it
timings on the OPs issue: