Bug 164951 – Flaky 32-bit JSC test timeouts: stress/op_div-* and ress/op_mod-*

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Ryan Haddad]

https://build.webkit.org/builders/Apple%20El%20Capitan%2032-bit%20JSC%20%28BuildAndTest%29/builds/4252

** The following JSC stress test failures have been introduced:
	stress/op_div-ConstVar.js.misc-ftl-no-cjit
	stress/op_div-VarConst.js.misc-ftl-no-cjit
	stress/op_div-VarVar.js.misc-ftl-no-cjit
	stress/op_mod-ConstVar.js.misc-ftl-no-cjit
	stress/op_mod-VarConst.js.misc-ftl-no-cjit
	stress/op_mod-VarVar.js.misc-ftl-no-cjit

[Ryan Haddad]

Another instance seen here:

https://build.webkit.org/builders/Apple%20El%20Capitan%2032-bit%20JSC%20%28BuildAndTest%29/builds/4226

** The following JSC stress test failures have been introduced:
	stress/op_div-VarConst.js.misc-ftl-no-cjit
	stress/op_mod-ConstVar.js.misc-ftl-no-cjit
	stress/op_mod-VarConst.js.misc-ftl-no-cjit
	stress/op_mod-VarVar.js.misc-ftl-no-cjit

[Mark Lam]

These are all due to time outs.  When did these failures started happening?  Either we started running on slower bots or potentially, someone introduced a perf regression.

[Ryan Haddad]

(In reply to comment #2)
> These are all due to time outs.  When did these failures started happening? 
> Either we started running on slower bots or potentially, someone introduced
> a perf regression.

I'm going through logs now to try to find out.

[Ryan Haddad]

Earliest instance I can find on this bot is r208607 / Fri Nov 11 13:56:25 2016

https://build.webkit.org/builders/Apple%20El%20Capitan%2032-bit%20JSC%20%28BuildAndTest%29/builds/4192

[Ryan Haddad]

The bot config has not changed.

[Mark Lam]

Created attachment 295255 [details]
proposed patch.

I'm fixing this by simply recognizing that not all tests are equal, and that some just needs more time to run.  I've added a --timeoutMultipler=<multiplier> option that can be used on these slower tests to increase their timeout duration.  This should fix this issue for good.

[Yusuke Suzuki]

Comment on attachment 295255 [details]
proposed patch.

View in context: https://bugs.webkit.org/attachment.cgi?id=295255&action=review

r=me

> Source/JavaScriptCore/jsc.cpp:2606
> +    auto timeout = std::chrono::microseconds(static_cast<std::chrono::microseconds::rep>(timeoutDuration * 1000000));

Let's use WTF::Seconds.

[Mark Lam]

Thanks for the review.  I've changed the timeout thread to use WTF::Seconds.

Landed in r208925: <http://trac.webkit.org/r208925>.

[Mark Lam]

I forgot to also lengthen the timeout for op_mod-* tests.  Will do that in https://bugs.webkit.org/show_bug.cgi?id=164994.

[Mark Lam]

*** Bug 155289 has been marked as a duplicate of this bug. ***