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From "Leon Rosenberg" <>
Subject Re: Response time banding
Date Wed, 26 Jul 2006 20:35:17 GMT
I would measure at all layers during the request processing to
determine whether irregularities occur somewhere.


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 <> 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.

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