Do your 2 second requests happen at a particular time of day? In the
early morning, when my database vacuum is running, my response times
shoot way up (to around 5 seconds). Check to see what else is going
on with your system during the times the page response times increase.
/kurt
On Jul 26, 2006, at 4:47 PM, Robert Harper wrote:
One thing to consider is that the times may not be totally in
synch. Some
threads pending a write to the log might get interrupted while another
thread runs. You may see log entries out of order. I have seen this
myself
and have added System.out.flush() to my logger. It helps but still
does not
ensure exact order. Make sure you go over the time stamps carefully
before
you pass too much judgment.
Robert S. Harper
Information Access Technology, Inc.
-----Original Message-----
From: Leon Rosenberg [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 26, 2006 2:35 PM
To: Tomcat Users List
Subject: Re: Response time banding
I would measure at all layers during the request processing to
determine whether irregularities occur somewhere.
Leon
P.S. "the response times as measured by the access log" - don't you
have the proper tools for that? JMeter?
On 7/26/06, Edward Hibbert <[EMAIL PROTECTED]> wrote:
Odd one, this. I'm posting looking for off the wall suggestions.
Though not too off the wall, please.
We have an application running under Tomcat. If we analyse the
response
times as measured by the access log, then we see that for the same
GET
operation there is a distribution of response times. Well, you'd
expect
that.
But while the bulk of response times are below about 0.25 seconds (in
most cases considerably below), there is a banding effect where we
get a
cluster of response times around 2 seconds, and another cluster
around 5
seconds, with little or no values in between.
We've looked at garbage collection as the most likely source of this,
and ruled it out. Has anyone seen anything similar, or got any
bright
ideas?
Regards,
Edward.
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]