544853 - TM: (x86_64) Fannkuch does not trace on x64

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, defect)

Description

[Arpad Borsos [:Swatinem]]

Dromaeos Fannkuch Benchmark does not trace well with the x64 backend.
Without tracing: ~55runs/s
With tracing: ~51runs/s

The 32bit backend achieves ~120runs/s on both Linux and Windows.

Comment 1

[David Anderson [:dvander] - inactive, e-mail if emergency]

Hrm, in the JS shell I get identical trace stats for x86 versus x64. I will be able to try a full browser build later this week though.

Comment 2

[Stefan Fleiter (:sfleiter)]

With javascript.options.jit.content set to false I get
http://dromaeo.com/?id=108791
with jit enabled I get
http://dromaeo.com/?id=108792

Both on:
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:2.0b2pre) Gecko/20100701 Minefield/4.0b2pre

Comment 3

[Stefan Fleiter (:sfleiter)]

So with content jit enabled the benchmark runs slower.
57.65runs/s vs. 70.55runs/s
(Sorry for spamming)

Comment 4

[Stefan Fleiter (:sfleiter)]

A last addition:
google-chrome handles
633.27runs/s
That means google chrome is 9 times as fast as firefox here.
http://dromaeo.com/?id=109068

google-chrome version: 5.0.375.99 beta

Comment 5

[David Anderson [:dvander] - inactive, e-mail if emergency]

This benchmark does not trace well in general - JM is seeing a 2X perf increase on access-fannkuch. One of the early tracer integration heuristics will be making sure we don't trace it.

Comment 6

[Ryan VanderMeulen [:RyanVM]]

Obsolete with the removal of tracejit.