1145831 - Find out why treeherder results in long gc pauses, even with a small GC heap

Status: NEW

(Core :: JavaScript: GC, defect)

Description

[Terrence Cole [:terrence]]

It's not as bad as tbpl was, but I've still noticed some appreciable lagginess after leaving several tabs open for a day, particularly with the debugger console open.

Comment 1

[Steve Fink [:sfink] [:s:]]

I'm really not sure how much this explains, but one thing that came out of the discussion is that currently whenever a new script is created, the devtools onNewScript handler calls findScripts (to avoid traversing just the new scripts with recursive getChildScripts calls, oddly enough.) That triggers a GC flush in order to iterate the heap.

That means that eval("") will do a finishGC whenever the debugger console is open.

See also bug 1145843.