On 12/11/12 15:47, Alex Keybl wrote:
Bug 799295 [1], the driver for this thread, is still an open issue for FF18 (shipping in
6 weeks). The JS team's recommendation remains to disable PGO on Linux. According to
Taras, the major benefits of PGO on Linux are for a "starry-eyed-future". Given
almost nobody uses Mozilla Firefox builds(and no Firefox disributors do pgo),
it may not be that bad to hurt startup for a few precious Linux users.
I'd like to suggest that we move forward with disabling PGO on Linux builds,
rather than investigating issues that our users will not see on their non-PGO
builds. If you have a differing opinion, please make a recommendation to the JS
team for how to resolve bug 799295. The only other recommendation in the bug is
to drop dromaeojs talos suite testing on Linux, which I don't have enough
context to comment on.
-Alex
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=799295
According to the bug, this crash occurs on most but not all runs of the
test concerned. That suggests to me that it's perhaps *not* a case of
PGO mis-compiling the code, but rather a latent bug in our code (perhaps
a race condition, for example) that is exposed by changed performance
characteristics of the PGO build.
If that's the case, ignoring the problem won't solve it, but leave it
lurking in the shadows for some future user to trip over when conditions
(e.g. performance) happen to be just right.
JK
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