jmeter-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Lists <li...@dankeeley.co.uk>
Subject Re: Time spent where?
Date Mon, 28 Jan 2008 16:39:05 GMT
We already have that data available.  The increase in end to end response
times is not matched identically by an increase in time spent running
queries.  ( There is some increase in db time, but not as much as is seen
end to end )

--------- Original Message --------
From: JMeter Users List <jmeter-user@jakarta.apache.org>
To: JMeter Users List <jmeter-user@jakarta.apache.org>
Subject: Re: Time spent where?
Date: 28/01/08 14:58

> what I would do is added some simple code to time how long the queries
take
> and write that to a file.
> 
> Back when I worked for Superpages.com, we had all sorts of performance
> logging, so that we could generate reports every night. In my case, we had
> service level agreements, so we had to log extensively and make sure
> response time were within the requirements.
> 
> peter
> 
> On Jan 28, 2008 9:23 AM, sebb  wrote:
> 
> > On 28/01/2008, Lists  wrote:
> > > Hi,
> > >
> > > I've posted about this before, but got some more info now.
> > >
> > > We have a standard apache -> tomcat -> oracle system.  In the db we
can
> > > access the total time spent in tomcat and oracle.  By analysing the
> > apache
> > > logs (modjk gives you an elapsed time) we can log the time spent in
> > apache,
> > > tomcat and oracle.
> > >
> > > And then of course jmeter gives us the overall end to end response
> > times.
> > >
> > > The problem i have is that at higher loads, the gap of response times
> > > reported by jmeter grows much faster than it does when reported at the
> > > apache layer.  So i thought this was caused by a busy jmeter server.
> > >
> > > So i ran 2 jmeters on 2 separate servers independantly (At half load).
> > > Unfortunately the gap remains.
> > >
> > > Is this a usual scenario that people see at high loads?  could the
> > figures
> > > being reported be lieing to me?  The DB server is under load at this
> > point
> > > but none of the other servers seem stressed.  I'm a bit stuck in how
to
> > > debug this further?
> > >
> >
> > How much longer? A few percent or much more?
> >
> > Are all samples affected?
> >
> > Does the additional time depend on the sample size?
> >
> > Note that the elapsed time will necessarily be longer than the apache
> > log time; the JMeter latency should be closer to the apache log
> > timings.
> >
> > Are you using any functions in the samplers? Function execution is
> > single-threaded.
> >
> > > Thanks,
> > > Dan
> > >
> > > ________________________________________________
> > > Message sent using UebiMiau 2.7.10
> > >
> > >
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> > > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> > >
> > >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >
> >
> 

________________________________________________
Message sent using UebiMiau 2.7.10



---------------------------------------------------------------------
To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: jmeter-user-help@jakarta.apache.org


Mime
View raw message