I did a blog entry about this in June in which I included a sample stack trace file to test it with. Download this to your machine and upload it through their interface. I just retested it and it still seems to work.
http://daveshuck.instantspot.com/blog/index.cfm/2006/6/5/SeeStack-online-stack-trace-tool
~Dave
On 10/26/06, Christopher Jordan <[EMAIL PROTECTED]> wrote:
Dave,
We had problems like this a long while back, (turns out that one of our db drivers wasn't thread safe - gasp! :o)), and a tool like this would have helped. Now we're not having problems like this anymore, but I wanted to check out the seefusion stack trace tool all the same. I have a page with an error and expanded the bit that says "Stack Trace (click to expand)". I copied that into the tool and it tells me it doesn't appear to be a valid stack trace.
I'm just curious (and this is by no means critical to me right now), but are there different sorts of stack traces?
Chris
Dave Shuck wrote:Ahmed, I imagine you are talking about doing metrics dumps. Just an FYI, there is a way to get similar metrics while continuing to run as a service (Windows only). Check this out:
http://www.bpurcell.org/blog/index.cfm?mode=entry&entry=1062
If you end up doing metrics dumps, rather than try to read it raw, save yourself a *lot* of time and use this free online stack trace parser. It is good stuff:
http://www.seefusion.com/seestack/seestack.cfm
Man these are frustrating problems to go through! Hang in there.
~Dave
On 10/25/06, AHMED EL-RASHEEDY <[EMAIL PROTECTED] > wrote: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 GHz2GB RAMWindows 2003 Server x64Jrun 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!
--
Michael Stowe
Network Administrator
Alcatraz Media, Inc.
(509) 232-0704
(888) 248-7211
http://www.alcatrazmedia.com/hosting----- Original Message -----From: Dave ShuckSent: Wednesday, October 25, 2006 1:08 PMSubject: Re: [DFW CFUG] not the first time you've heard from meKevin, 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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