The current parameters (initial slack = 6, kGenerousAllocationsCount = 16)
caused 15-20% performance regression on 3d-raytrace on x64
(visible both in standalone shell and in the web harness). This is very
likely some kind of an alignment problem (it goes away completely with --prof).
A similar problem can be observed on ia32 with initial slack=2.
Increased initial slack to 8 and decreased constructions count to 8.
This made the regression go away (and did not harm any of the other tests).
Review URL: http://codereview.chromium.org/3595002
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5571
ce2b1a6d-e550-0410-aec6-
3dcde31c8c00
// Inobject slack tracking will reclaim redundant inobject space later,
// so we can afford to adjust the estimate generously.
- return estimate + 6;
+ return estimate + 8;
}
// Important: inobject slack tracking is not attempted during the snapshot
// creation.
- static const int kGenerousAllocationCount = 16;
+ static const int kGenerousAllocationCount = 8;
// [construction_count]: Counter for constructor calls made during
// the tracking phase.