[cfaussie] Re: CF server "spikes" on CPU

[Geoff Bowers]

Beattie, Barry wrote:
JRUN spikes when it is compiling CF code and when it is doing garbage
collection.  
well, it's doing it all the time - like a heartbeat. does it really garbage
collect every 20 secs or so?
Garbage collection depends on the activity of your application.  Are you 
robocopying files?  Can you turn on TRUSTED CACHE?  The latter would at 
least get rid of any chance of constant compiling.

What are your JVM settings for the servers?
you mean the "Java and JVM settings" in the admin? the only setting there is
Maximum Memory Size = 256Mb and the jre path.
How much memory is JRUN using?  Have you tried increasing the memory 
allocation?

Are you seeing slowdowns during peak traffic or just "for no apparent
reason"? 
well, considering that the problem machine spac's out with as few as 4
people hitting it, I'd have to say "for no apparent reason".
Does it "spac out" on specific pages or just any CF activity at all. 
Does it "spac out" immediately after recycling services or does it take 
time to develop a "spac attack".

I've been thinking (a wild guess) it starts when DWMX polls CF's datasources
(using RDS), locks the connections open and then stops pages from using
those datasources. But I'm having trouble proving it. And besides, they're
both MM product - they should work together happily, yes?*
Should be easy enough to test that.  Just shut down RDS for a day and 
see what happens.

*a cavat: we have used RDS sucessfully many times before with UD4 and
ASP/IIS. what we're doing with CF, RDS, MSAccess and a webserver is nothing
strange or different. It -could- be a config for RDS (we had all sorts of
probs getting it to work with CF) but with so few people on list using
DW+RDS and CF it's mostly guesswork. Sadly, we haven't an option to drop RDS
or use other db's.
RDS is a CF Specific thing, no?  So its likely ASP/IIS are using a 
different mechanism.

anything else worth checking/trying out?
Yeah plenty of things.  Just too hard via email :)  You got to be 
methodical.  Elimnate different issues till you home in on the problem.

-- geoff
http://www.daemon.com.au/
---
You are currently subscribed to cfaussie as: [EMAIL PROTECTED]
To unsubscribe send a blank email to [EMAIL PROTECTED]
MXDU2004 + Macromedia DevCon AsiaPac + Sydney, Australia
http://www.mxdu.com/ + 24-25 February, 2004