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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: very slow class loading on initial JSP/servlet request after restart
Date Tue, 24 Feb 2009 21:54:18 GMT
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Sam,

On 2/24/2009 1:54 PM, Sam Hokin wrote:
> Mark Thomas wrote:
>> Sam Hokin wrote:
>>> Thanks, Chris.  I ran e2fsck with the -c option, which runs badblocks,
>>> when I tested it earlier.  And I just ran badblocks again - 0 bad blocks
>>> found.  I wish I could fix this by simply as swapping out a bad disk
>>> (notwithstanding Andre's desire for intellectual pursuits), but I really
>>> think it's software, either in some service mucking up the JVM or the
>>> JVM itself.  But it only manifests itself under Tomcat, and then only
>>> when this particular package is imported.
>>
>> Do you see the same issue if you pre-compile that JSP?
> 
> Surprisingly, yes.  So it's not only a compilation issue.  After some
> individual tests, I compiled the JSPs from the four sites I have running
> on this server and restarted Tomcat, and the LONG delay before Tomcat
> begins serving page requests continues.

... and what is happening when you take a thread dump. Is it
File.exists() taking forever again? If that's the case, the class
loading is what's taking forever. I have no idea what could be causing
that other than a disk read error (or network latency, but you mentioned
you weren't using NFS or anything like that).

Someone mentioned running strace which sounds like a good idea to me.
You'll just have to sift through a ton of information to find what
you're looking for since the JVM performs a /lot/ of system calls during
its operation.

- -chris
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