We had a weird CF-stability problem on one IIS7 server and it turned out
to be related to the IIS app pool... We deleted and recreated the
default pool and the problem cleared up. This didn't make us feel all
that good, but at least the problem went away. Be sure to check the
Event Viewer to see if there are recurring problems there.
Thanks
Mark
-----Original Message-----
From: Erick Larin [mailto:ela...@uwf.edu]
Sent: Thursday, March 19, 2009 3:39 PM
To: cf-talk
Subject: ColdFusion 8.0.1 Performance Affected by IIS7 Application Pool
Hello,
I'm running CF 8.0.1 on Windows 2008 server (32-bit) using a standard
instance install (not multi-instance). I'm having a performance
degradation issue when any of the following happens:
- ASP.NET error occurs
- editing a CF security sandbox entry
This morning, I finally tracked down the culprit - IIS application pool.
In task manager, the OS thread count for the application pool process
(w3wp.exe) assigned to my site starts increasing when any of those two
events occur. CF requests either timeout or take minutes to complete;
non-CF pages are served in a timely manner.
Overall, I'm seeing that the health of the application pool assigned to
my web site affects CF negatively. I understand CF has its own jrun.exe
process, but an application pool (w3wp.exe process) does come into play
for CF requests. You can see this by viewing current requests under
"Worker Processes". I know this means IIS is simply getting the request
first and then handing off to CF. So what I'm experiencing is a contrast
to most people saying CF and IIS application pools are not related. They
seem to be with IIS 7 and/or CF 8.
So why is CF and IIS not playing well together when the application pool
suffers? I've found a workaround which is to recycle the application
pool. Afterwards, my web site is snappy again.
- Erick
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