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v8 pauses forever at 100% CPU during Context::New and mksnapshot
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v8@chilon.net  
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 More options Dec 30 2010, 9:54 am
From: "v...@chilon.net" <you.dont.know.je...@gmail.com>
Date: Thu, 30 Dec 2010 06:54:09 -0800 (PST)
Local: Thurs, Dec 30 2010 9:54 am
Subject: v8 pauses forever at 100% CPU during Context::New and mksnapshot
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Hi,

Building v8 on centos 5 using:

scons arch=x64

Any code I link against libv8 now pauses forever at 100% CPU usage
when I call v8::Context::New()

I tried building with:

scons arch=x64 snapshot=on

This caused the build system to pause forever at 100% CPU running a
script called "mksnapshot".

Tried this using tags: 2.3.8, 2.5.9.6, branch 2.5 and trunk.

Is there a known issue with libv8 not working on Centos 5/Redhat 5?


 
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Vyacheslav Egorov  
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 More options Dec 30 2010, 9:57 am
From: Vyacheslav Egorov <vego...@chromium.org>
Date: Thu, 30 Dec 2010 15:57:41 +0100
Local: Thurs, Dec 30 2010 9:57 am
Subject: Re: [v8-users] v8 pauses forever at 100% CPU during Context::New and mksnapshot
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What happens when you build debug version of v8?

scons arch=x64 shapshot=on mode=debug

Which version of GCC you are using?

--
Vyacheslav Egorov

On Thu, Dec 30, 2010 at 3:54 PM, v...@chilon.net <


 
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v8@chilon.net  
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 More options Dec 30 2010, 10:06 am
From: "v...@chilon.net" <you.dont.know.je...@gmail.com>
Date: Thu, 30 Dec 2010 07:06:13 -0800 (PST)
Local: Thurs, Dec 30 2010 10:06 am
Subject: Re: v8 pauses forever at 100% CPU during Context::New and mksnapshot
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Thanks for responding quickly.

I'm using gcc 4.5.1.

When I compile using "mode=debug" then mksnapshot works fine and my
code stops freezing.

mode=release causes the 100% CPU freeze from at least version 2.3.8
onwards. Bad code generation using gcc 4.5.1 and -O3 maybe?

On Dec 30, 2:57 pm, Vyacheslav Egorov <vego...@chromium.org> wrote:


 
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Vyacheslav Egorov  
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 More options Dec 30 2010, 10:27 am
From: Vyacheslav Egorov <vego...@chromium.org>
Date: Thu, 30 Dec 2010 16:27:52 +0100
Local: Thurs, Dec 30 2010 10:27 am
Subject: Re: [v8-users] Re: v8 pauses forever at 100% CPU during Context::New and mksnapshot
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I think you have encountered the following issue:

http://code.google.com/p/v8/issues/detail?id=884

--
Vyacheslav Egorov

On Thu, Dec 30, 2010 at 4:06 PM, v...@chilon.net <


 
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v8@chilon.net  
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 More options Dec 30 2010, 10:45 am
From: "v...@chilon.net" <you.dont.know.je...@gmail.com>
Date: Thu, 30 Dec 2010 07:45:37 -0800 (PST)
Local: Thurs, Dec 30 2010 10:45 am
Subject: Re: v8 pauses forever at 100% CPU during Context::New and mksnapshot
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Thank you,

That looks like the problem. I fixed it by adding the compiler flag "-
fno-builtin-memcpy"

Could someone with source access put a test in the scons script to set
this compiler option when the gcc version is 4.5.x? The gcc bugzilla
says this fix will be ready in gcc 4.6.

Cheers, James

On Dec 30, 3:27 pm, Vyacheslav Egorov <vego...@chromium.org> wrote:


 
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