[Catalyst] Re: How to read the performance information
pagaltzis at gmx.de
Sat Feb 20 05:01:05 GMT 2010
* Andrew Rodland <andrew at cleverdomain.org> [2010-02-19 07:35]:
> On Thursday 18 February 2010 11:14:46 pm Julien Sobrier wrote:
> > The time don't add up. Form the timing under Action. it took
> > less than 1 second. But the line before says 8.27s. Does it
> > mean 7+ seconds were spend doing something else? Doing what?
> There are two things that spring to mind:
> 1. Time spent reading the request from the user (after the
> connection is made but before the full request is received) is
> accounted to the "Request took" time but not to any action.
> Normally this should be a very small amount of time for a GET,
> but in case of very bad network conditions it could be longer.
> This wouldn't be any indication of the performance of your app.
> 2. Your system could have had a major I/O stall between the
> beginning of request handling and the beginning of action
> dispatch, or between the end of action dispatch and the end of
> request handling. You would probably know if this was
> happening. :)
Or something that qualifies as both. My immediate first suspicion
in such cases: check your DNS lookup machinery.
Aristotle Pagaltzis // <http://plasmasturm.org/>
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