572807 - tracing+fatvals: Investigate perf regression on Peacekeeper canvas tests

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[David Mandelin [:dmandelin]]

We get a noticeable slowdown on the canvas subtest compared to TM. When I run the official suite, I get about a 20% slowdown. I'm not sure exactly how that total is computed from the individual test scores, but here they are, from a local copy:

                 TM         FV

movie        66.624     66.580
ripple1      31.383     23.026
ripple2      15.130      9.768

The ripples seem to be the same test, just different image sizes.

Comment 1

[David Mandelin [:dmandelin]]

Now that I know that disabling traceable natives prevents unknown amounts of stuff from tracing, it seems possible that bug 572593 will fix this.

Comment 2

[David Mandelin [:dmandelin]]

We did this work in bug 571623. ripple scores are back up to TM levels.