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Posted to user@jmeter.apache.org by jm...@fastmail.fm on 2014/09/03 18:25:58 UTC
default JMeter caching
Hi,
I'd like to understand a little a bit about default JMeter caching.
I have a site behind Varnish caching. However, when I ran the tests
through Varnish and by bypassing Varnish the results were similar. It
was only when I added: "cache-control: no-cache" (in the non-Varnish
tests) to the request header that I received slower response times
I wonder why this is, and if JMeter is caching locally?
Many Thanks
Paul
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Re: default JMeter caching
Posted by Tim Koopmans <ti...@flood.io>.
You might find our blog post on this useful:
https://flood.io/blog/18-understanding-the-jmeter-cache
You might also want to double check your varnish config (and that it is
actually caching responses from the backend / origin servers). I like to
add debug headers so you can view hit/miss stats from the client -- see
slide 25 in my presentation here
http://www.slideshare.net/90kts/caching-with-varnish-9864681 -- sometimes
other things can cause varnish not to cache, like presence of cookies in
the request headers etc.
Then you can manually verify what JMeter is or isn't doing with a view
results tree listener in the GUI first -- before running an actual load
test with listeners disabled etc.
Regards,
Tim Koopmans
+61 3 9221 6309
[image: Flood IO Pty Ltd] <https://flood.io>
Level 27, 101 Collins Street
Melbourne, Vic 3000
On Thu, Sep 4, 2014 at 2:25 AM, <jm...@fastmail.fm> wrote:
> Hi,
>
> I'd like to understand a little a bit about default JMeter caching.
>
> I have a site behind Varnish caching. However, when I ran the tests
> through Varnish and by bypassing Varnish the results were similar. It
> was only when I added: "cache-control: no-cache" (in the non-Varnish
> tests) to the request header that I received slower response times
>
> I wonder why this is, and if JMeter is caching locally?
>
> Many Thanks
>
> Paul
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@jmeter.apache.org
> For additional commands, e-mail: user-help@jmeter.apache.org
>
>
Re: default JMeter caching
Posted by Jeff Ohrstrom <jo...@hotmail.com>.
That's an interesting question that deserves looking into the code.
However from the RFC it seems that header directive is telling the
origin server not to cache not the client.
http://tools.ietf.org/html/rfc2616#section-14.9.1
On Wed, 2014-09-03 at 09:25 -0700, jmeter_account@fastmail.fm wrote:
> Hi,
>
> I'd like to understand a little a bit about default JMeter caching.
>
> I have a site behind Varnish caching. However, when I ran the tests
> through Varnish and by bypassing Varnish the results were similar. It
> was only when I added: "cache-control: no-cache" (in the non-Varnish
> tests) to the request header that I received slower response times
>
> I wonder why this is, and if JMeter is caching locally?
>
> Many Thanks
>
> Paul
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@jmeter.apache.org
> For additional commands, e-mail: user-help@jmeter.apache.org
>
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