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Date: Sat, 31 Dec 2005 23:32:26 +0800
From: Huang wen hui <hwh@gddsn.org.cn>
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To: Michael Vince <mv@roq.com>
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Cc: java <java@freebsd.org>
Subject: Re: JDK1.5.0-p2/amd64 offen crash
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Michael Vince wrote:

> Yes I have been able to crash it very easily with my own Java servlets 
> as well.

use libpthread in this case ?

>
> Firstly I recommend you do not use the libthr threading library for 
> Java, especially on AMD64/EMT64 setups as it does indeed appear to be 
> quite unstable.
> After some extensive benchmarking on my stuff I have decided libthr is 
> not good with Java unlike using it for MySQL or Apache.

You are right, revert back to libpthread, jdk1.5.0-p2 is more stable. I 
did not get crash on 3 servers in 8 hours.
I do not recognize java+libthr is bad idea in amd64.
Thank you!

--hwh

>
> With libthr it might help to increase your thread limits, I have this 
> in sysctl.conf
> kern.threads.max_threads_per_proc=40000
> kern.threads.max_groups_per_proc=40000
>
> If you want to try alternative threading setups I recommend trying 
> this one.
> [/usr/local/jdk1.5.0/]
> libc_r.so.6             libpthread.so.2 # Everything now uses 
> 'libpthread'
> libc_r.so               libpthread.so   #
>
> Mike
>