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Differential D19545

Count lines in build log slices more cheaply
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Authored by epriestley on Jul 27 2018, 8:33 PM.

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T13164: Plans: 2018 Week 31 - 33 Bonus Content

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rP9cf3b3bbf806: Count lines in build log slices more cheaply

Summary

See PHI766. Ref T13164. Build log chunk processing does a preg_split() on slices, but this isn't terribly efficient.

We can get the same count more cheaply by just using substr_count() a few times.

(I also tried preg_match_all(), which was between the two in speed.)

Test Plan

Used bin/harbormaster rebuild-log --id X --force to rebuild logs. Verified that the linemap is identical before/after this change.
Saw local time for the 18MB log in PHI766 drop from ~1.7s to ~900ms, and preg_split() drop out of the profiler (we're now spending the biggest chunk of time on gzdeflate()).

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epriestley created this revision.Jul 27 2018, 8:33 PM

Owners added a subscriber: Restricted Owners Package.Jul 27 2018, 8:33 PM

epriestley edited the test plan for this revision. (Show Details)Jul 27 2018, 8:34 PM

Harbormaster completed remote builds in B20526: Diff 46729.Jul 27 2018, 8:34 PM

epriestley requested review of this revision.Jul 27 2018, 8:34 PM

epriestley edited the summary of this revision. (Show Details)Jul 27 2018, 8:34 PM

epriestley added a task: T13164: Plans: 2018 Week 31 - 33 Bonus Content.

howneatisthat

This revision is now accepted and ready to land.Jul 29 2018, 4:05 PM

This is also mathematically equivalent to $n_r + $n_n - $n_rn I suppose, but it's probably clearer like this.

Closed by commit rP9cf3b3bbf806: Count lines in build log slices more cheaply (authored by epriestley). · Explain WhyJul 30 2018, 3:25 PM

This revision was automatically updated to reflect the committed changes.

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src/

applications/

harbormaster/

storage/

build/

HarbormasterBuildLog.php

8 lines

Diff 46734

src/applications/harbormaster/storage/build/HarbormasterBuildLog.php

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