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Message-ID: <9623c9a50712090336u621667f7r42c89119bd0ea6bc@mail.gmail.com>
Date: Sun, 9 Dec 2007 19:36:06 +0800
From: "Xiao-Feng Li" <xiaofeng.li@gmail.com>
To: dev@harmony.apache.org
Subject: Re: Make GC_CC working
In-Reply-To: <5ce835490712081811q5e787c84j24ef33c07fdecb9c@mail.gmail.com>
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References: <5ce835490712081811q5e787c84j24ef33c07fdecb9c@mail.gmail.com>

I'd like to have GC_CC in M4. If no objections in 24 hours, I will
commit the patch. Thanks. -xiaofeng

On Dec 9, 2007 10:11 AM, Ilya Berezhniuk <ilya.berezhniuk@gmail.com> wrote:
> Hi All,
>
> Now we have GC_CC inoperable on most platforms - it works on
> Windows/x86/release only.
>
> I've checked M3 build, GC_CC works fine (although hangs from time to time).
>
>
> I suggest committing HARMONY-5247 and HARMONY-5262 patches to fix most
> of current GC_CC problems.
>
> The problems are the following:
>
> 1) After r583223 threading commit GC_CC does not work in debug mode
> because of multiple assertions.
>
> 2) After r587472 commit (symbols exporting policy) GC_CC was broken on
> Linux because several symbols required by GC_CC were not added to EXP
> files.
>
> 3) After r599482 commit (uncompressed references) GC_CC works
> incorrectly on x86_64 because of changed object layout for 64bit
> platforms.
>
> 4) GC_CC often hangs in shutdown. HARMONY-5136 has fixed the problem
> for GC_GEN, but for GC_CC the problem still exists because of
> different GC/Finalizer threads behavior.
>
>
> HARMONY-5247 patch finally fixes the problem with shutdown deadlock on
> ThreadGroup.lock monitor.
>
>
> HARMONY-5262 patch fixes GC_CC problems 1) - 3).
>
> With both these patches all 'build test' tests are passed on
> Windows/Linux x86 and on Linux/x86_64 in both debug and release modes.
>
> On 4-core Windows/x86_64 I've got 4 intermittent failures on debug
> build (see details in HARMONY-5262), but these failures are not
> reproducible on release build, and they also do not appear on 2-core
> machine.
> Looks like these failures are caused by some remaining threading
> problems in GC_CC.
>
> Since HARMONY-5262 affects only GC_CC, all tests are passed with
> GC_GEN on all 4 tested platforms.
>
>
> I think it's valuable to make GC_CC working, if we are planning to
> include it into M4 builds.
>
>
> Thanks,
> Ilya.
>


-- 
http://xiao-feng.blogspot.com