Bug 100036 - REGRESSION(r116210 - r131528): Hindi line-breaking on TOT is 5% slower than Safari 6.0.1
Summary: REGRESSION(r116210 - r131528): Hindi line-breaking on TOT is 5% slower than S...
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Layout and Rendering (show other bugs)
Version: 528+ (Nightly build)
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on: 100024
Blocks:
  Show dependency tree / graph
 
Reported: 2012-10-22 14:53 PDT by Eric Seidel (no email)
Modified: 2012-10-22 15:10 PDT (History)
5 users (show)

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Description Eric Seidel (no email) 2012-10-22 14:53:28 PDT 
REGRESSION(r116210 - r131528): Hindi line-breaking on TOT is 5% slower than Safari 6.0.1

Obviously the real regression range is much smaller.  r116210 is when safari-536-branch (Safari 6) was made from trunk.

The microbenchmark in question is attached to bug 100024.  I wrote the microbenchmark to make sure that the 8-bit TextRun optimization (bug 99393) wouldn't be a slowdown for complex text for the harfbuzz ports.

It's also possible that the microbenchmark a.  doesn't test what I want it to.  or b. isn't interesting and that this isn't a regression we care about.
Comment 1 Eric Seidel (no email) 2012-10-22 14:57:44 PDT 
On my rMBP:

r131528:
avg 95.18194456386033 runs/s
median 95.1814733027575 runs/s
stdev 0.22485624887911804 runs/s
min 94.7867298578199 runs/s
max 95.4653937947494 runs/s

Safari 6.0.1 (8536.26.14):
avg 104.41866244835714 runs/s
median 104.43864229765013 runs/s
stdev 0.22674389758002172 runs/s
min 104.03120936280884 runs/s
max 104.84927916120577 runs/s
Comment 2 Alexey Proskuryakov 2012-10-22 15:10:22 PDT 
<rdar://problem/12551884>