Hi.
To implement a recommendation from someone on this list, I took a few
snapshots using jmap -heap pid while Tomcat was starting up and also
starting up a webapp.
I just ran the jmap command several times at about 5 second intervals,
and redirected the output to a file.
Below if the file
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
André,
André Warnier wrote:
When I started in this business, 64 Kb was a nice quantity of memory to
program in, and quite expensive too. I created and ran a payroll
application for a 1,000 people company in there. This Java app looks a
lot cuter
David kerber wrote:
Pid wrote:
...
Having said that, parsing XML can be a memory intensive operation as
well, so your old box could be experiencing problems there - check the
garbage collection log.
p
I try to avoid XML for this exact reason. We found that our application
could handle
From: André Warnier [mailto:[EMAIL PROTECTED]
Subject: Re: Tomcat threads, II
We have already tried - because that is one thing we can do - to split
the XML data into smaller chunks, but that does not seem to have any
significant impact.
Nor would I expect it to. The total amount of memory
From: André Warnier [mailto:[EMAIL PROTECTED]
Subject: Tomcat threads, II
-classpath :/usr/lib/jvm/java-1.5.0-sun/jre//lib/jcert.jar:
/usr/lib/jvm/java-1.5.0-sun/jre//lib/jnet.jar:
/usr/lib/jvm/java-1.5.0-sun/jre//lib/jsse.jar:
/usr/share/tomcat5.5/bin/bootstrap.jar:
Caldarale, Charles R wrote:
From: André Warnier [mailto:[EMAIL PROTECTED]
Subject: Tomcat threads, II
-Djava.security.manager
Enabling the security manager slows things down; do you really need it?
Not as far as I know. It was only the default setting on that system,
from the
André Warnier wrote:
Hi again.
Now that I have (with your help) established some basic facts, I have a
practical case for analysis.
Before I get into details (because this is quite long), I'd like to
explain the reason why I'm asking this.
We have been testing a Tomcat application from a
From: André Warnier [mailto:[EMAIL PROTECTED]
Subject: Re: Tomcat threads, II
I have turned it off now, and restarted Tomcat, but it
did not have any noticeable impact on the startup time.
Wouldn't expect it to, since you're spending nearly all the time parsing that
XML file.
It may have
Pid wrote:
...
Having said that, parsing XML can be a memory intensive operation as
well, so your old box could be experiencing problems there - check the
garbage collection log.
p
I try to avoid XML for this exact reason. We found that our application
could handle between 6 and 10 times
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
André,
Christopher Schultz wrote:
A few parting thoughts:
I knew I was forgetting something:
3. During your 5-minute startup freeze, try taking a few thread dumps
(send a QUIT signal to your JVM) and seeing what the app is doing. Maybe
it's just
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
André,
At the risk of repeating things said by others...
André Warnier wrote:
We have an old clunker PC (Pentium II, 512 Mb Ram, average ATA disks),
which we use to test some applications (not only Java/Tomcat).
Based upon this hardware
André Warnier wrote:
Now that I have (with your help) established some basic facts, I have a
practical case for analysis.
We have an old clunker PC (Pentium II, 512 Mb Ram, average ATA disks),
which we use to test some applications (not only Java/Tomcat).
...
Now, if I stop and restart
Christopher Schultz schrieb am 12.11.2008 um 16:42:06 (-0500):
André Warnier wrote:
In other words, while this application is being loaded, our Tomcat
and the whole system are totally unresponsive for about 5 minutes.
1. DNS settings. Especially when parsing XML (which often requires
Chris, Chuck and others,
many thanks for taking the time to educate me (on both Tomcat threads
threads).
I got lots of information and tips, which will be useful now or later.
I'll now go sift through them again. At least now I have an idea where
to start.
About the fact that my hardware
André Warnier schrieb am 13.11.2008 um 00:08:05 (+0100):
[...] on the same machine I have a text search and retrieval
application that can sift through a full-text index of 100,000
documents (1 Gb of text) and retrieve the ones I want in couple of
seconds. It has a 10 Mb memory footprint.
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