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This is our current ( Changed with suggestions
given ) JVM args:
java.args=-server -Dsun.io.useCanonCaches=false -Xms768m -Xmx768m
-XX:MaxPermSize=256m -Xincgc -DJINTEGRA_NATIVE_MODE -DJINTEGRA_PREFETCH_ENUMS
-Dcoldfusion.rootDir={application.home}/
--
So far no 100% usage..but I am seeing spikes
now..of 50% or less that seem to last a second or two. I assume this is the GC
going on?
Thanks!
----- Original Message -----
Sent: Wednesday, October 25, 2006 9:32
PM
Subject: Re: [DFW CFUG] not the first
time you've heard from me
Try this
Go to your jvm.config file in \JRun4\bin\ in the
multi-server install (it may be under cfusionmx7 in the single
instance.
Look for the java.args line and change the argument for the
MaxPermSize from 128m to 256m.as below
java.args=-server -Xmx512m -Dsun.io.useCanonCaches=false -XX:MaxPermSize=256m...
Keep in mind that
on a windows machine you are allowed to use 1500 MB in combined memory for
each JVM (Macromedia support say it is 1.8 GB but the most it would
allow CF to restart with is 1500MB).
So if you are allocating 1 GB to your
JVM and take 256m out of it for the MaxPermSize then you are left with
whatever is left of the 1 GB.
As far as tools to monitor the JVM, there
is a tool that monitors the JVM which is a Java Util that I got from
Macromedia support at my previous job. It allows you to see the memory
allocation in the JVM. It was pretty neat but required running the CF from
console not as a Windows service. It is not available out there but I will see
if I can get it somehow and post it to the DFWCFUG.
Let us know if
changing the MaxPermSize works.
Thanks,
Ahmed El-Rasheedy
On 10/25/06, Eric
Knipp <
[EMAIL PROTECTED]> wrote:
Have
you looked at increasing the maximum permanent generation size? This
helped a lot at my last job. Your problem could be directly related to
garbage collection.
On 10/25/06, Michael
Stowe <
[EMAIL PROTECTED]> wrote:
Dave:
The other issue that I was concerned about
was the garbage collection. The JVM is currently runing with a 768M heap.
I had seen some tech notes on GC that can cause 100% cpu usage. I tried
using the low pulse collector, but that didn't seem to help.
To further elaborate on Kevin's
information:
We have two twin systems:
1x Opteron 246 2 GHz
2GB RAM
Windows 2003 Server x64
Jrun of course is running in 32bit mode. It
is also running as a local user for interaction with our SMB file
server.
We have the latest version of SeeFusion on
both systems. What I have observed is that the query times to the database
are less than a second ( Fractions of ). Where we run into problems is CF
rendering the results. We start seeing 6+ second times after the query has
executed.
I have also been running a tool on our DB
server called mytop..basically identical to the top command on Linux /
UNIX systems. It allows for per-thread montitoring of incoming queries.
The types of queries are on average very
short..but there are times when very large reports on data are ran. We
also use a mixture of MyISIAM and InnoDB tables. The rows in the InnoDB
tables are very long. I'm wondering if this can be part of the issue
too?
Thanks agian!
-----
Original Message -----
Sent:
Wednesday, October 25, 2006 1:08 PM
Subject:
Re: [DFW CFUG] not the first time you've heard from me
Kevin, I felt the same way on my first pass of
SeeFusion. However, we enlisted their (Webapper) consulting
services and after seeing how they used the tool, its value became
apparent *very* fast. With SeeFusion you can watch the threads
come and go, and find long running or hanging requests. They also
have a wrapper that you can put around your jdbc:// path in your DSNs
that will log the database interaction and you can monitor all the way
down to specific lines of code and queries that are breaking your
stuff. Believe me, I understand your plight. We had an
application tailspin on us like this and the Webapper guys helped us
nail it. I don't know what your budget is like but if you can
afford to contract them in on the troubleshooting, I can almost
guarantee you will feel it was money well spent.
~Dave
On 10/25/06, Kevin <[EMAIL PROTECTED]> wrote:
I am so tired of trying to find out the answer to these problems
that I'm about to look for a job flipping burgers.
We continue to have 100% JRUN issues on our servers.
We have windows 2003 64x servers – plenty of ram, etc.
We have a Linux box running mySQL 5 – plenty of ram, etc.
Our systems are all production systems. Everything is built
on the fly. Therefore I KNOW that there are some code issues and
db issues. I can't even begin to correct these issues because
the servers keep maxing out the JRUN and crashing.
Can anyone help? See fusion sux for some reason and has been
no help. Are there any tools out there that we can use to
monitor traffic and requests by cf and mySQL to help us identify where
the problems are?
Thank you for any help you can provide.
kevin
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--
~Dave Shuck
[EMAIL PROTECTED]
www.daveshuck.com
Where's your Spot?
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