Hi Barry,
Yep we are on JRun. I haven't had a look at those logs on our
production machine before so that's definitely something I'll check out.
Thanks again,
Andrew.
Sent from my iPod
On 26/01/2010, at 10:22 PM, Barry Chesterman
<barrychester...@gmail.com> wrote:
I actually meant 'JRun' logs which in my case are logs from the JVM
as well :) but then it depends on your configuration, do you run
coldfusion with JRun or something else?
JRun logs are normally directly in the logs folder within the JRun
directory.
On Tue, Jan 26, 2010 at 11:52 PM, Andrew Myers <am2...@gmail.com>
wrote:
Hi Barry,
Just wondering about the JVM logs you refer to. I'm not sure I've
seen these before. Any advice on what files I should be looking for?
Thanks,
Andrew.
Sent from my iPod
On 25/01/2010, at 5:54 PM, BarryC <barrychester...@gmail.com> wrote:
There are many ways to go about finding what's going on in Coldfusion.
Elaborating on what Kai was mentioning about metrics/garbage
collection/memory..
Have you had a look in the logs from the JVM and ColdFusion to see if
there are any error messages that might be related?
The first thing you could do is turn on logging of long running
requests (somewhere in coldfusion administrator)
That might give you some clues as to what pages could be causing more
load / cpu usage.
Enable logging of metrics to see if you may have too many active
handler threads (concurrent running processes of requests), you may
need to configure some settings to optimise these values.
The second thing you could do is do some thread dumps (you can do this
either with a utility - there is one called StackTrace' or you can do
it manually from a command prompt after you manually start coldfusion)
Do several heap dumps every 10 seconds and see if there are common
functions or pages coming up in the thread dump (the things that need
more processing should come up more frequently in those logs).
Thread dumps are generally used if you find you are getting
bottlenecks in your application and you need to find what parts of
your app could be doing the bottlenecking. So if you aren't getting
long running pages then you may not need to do this.
If you think it's memory related (and if you are getting tight on
memory for your application, that will cause more 'Major' garbage
collection events using more CPU) then you can enable garbage
collection logging, a free analyzer tool called GCViewer
http://www.tagtraum.com/gcviewer.html lets you get a graphical view of
what's going on as a memory overview. If it looks like you have a
memory problem, then you can generate heap dumps and use something
like the Eclipse memory analyzer plugin (MAT) to view the heap dump
log.
Google will tell you how to generate heap dumps.
An awesome profiling tool that I found very useful was Oracle's
Jrockit Mission Control (used to be owned by BEA or something
arather). It's free for development and you can do profiling with that
and see pretty much everything that's going on in coldfusion.
You do have to update your config file to point to that though, and it
could be slightly dodgy running it in a production environment, it's
more something you use in a development environment.
There's a lot to learn when it comes to the under the hood performance
and memory stuff but it's quite interesting and very good to know as a
developer how all that stuff works.
Barry
On Jan 25, 4:20 pm, Andrew <am2...@gmail.com> wrote:
Hi Folks,
My hosting company has just informed me that the CF7 instance for a
site I maintain is using about 65% CPU at the moment (on a Solaris
machine). The site uses quite a few frameworks - ModelGlue,
ColdSpring, Transfer and Javaloader.
We have recently attempted to move this to CF8 but aborted the attempt
because it basically just ground the server to a halt. So I think
there is something more sinister going on here that I need to sort out
before we attempt that again.
However I'm a bit stuck with where to go from here. The site has been
going along quite nicely until recently. Traffic has grown quite a
lot in the last 1-2 years which I'm sure is not unrelated. Just to
throw a few extra spanners into the works I *believe* this is a shared
server but I have no information on what else is running on it and
whether that could possibly be causing us problems.
I know this is very very vague but I don't get a lot of info from our
hosting provider except that we are using up too many resources.
Perhaps we have just outgrown our current hardware, but I am not sure
how to confirm this. Any suggestions on what I could start looking at
to track down the source of the issues would be hugely appreciated.
Andrew.
P.S. I do have a development server which is identical except that it
only has 2GB RAM as opposed to the 4GB in production. Load testing on
this is definitely an option - I have used JMeter in the past but not
sure I have used it optimally. Anyone got any suggestions on load/
stress testing tools?
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