Fwd: Measuring request processing time

[Дмитрий Шалашов]

Thanks! That is a good idea.

So Nginx will do some work to fill these variables only in their
corresponding locations?


Best regards,
Dmitriy Shalashov

2015-05-27 17:53 GMT+03:00 Maxim Dounin <mdounin at mdounin.ru>:

> Hello!
>
> On Wed, May 27, 2015 at 05:08:52PM +0300, Дмитрий Шалашов wrote:
>
> > Hi!
> >
> > Is there a way to measure time Nginx takes to process request? Not
> > $request_time, but rather something like "time between request was fully
> > read and request is ready to pass it to the backend".
> > I need it to evaluate perfomance of the geoip2 module:
> > https://github.com/leev/ngx_http_geoip2_module
> >
> > I need this because I've measured speed of official MaxMind Perl modules
> > for legacy and new versions of their databases and found that lib for new
> > version is hundreds times slower than legacy. (yes, I've used XS version)
> > Now, I will be using new format anyway - because MaxMind provide only
> free
> > legacy databases, and free databases have way too bad accuracy.
> > But I would like to assess the consequences.
> >
> > Maybe $request_time - $upstream_response_time will fit?
>
> I don't think that resolution of nginx time-related variables will
> be enough to measure geoip lookup times.   If you want to evaluate
> performance, I would rather suggest to write some simple configs
> like:
>
>         location = /geoip1 {
>             return 200 $geoip_country_code;
>         }
>
>         location = /geoip2 {
>             return 200 $geoip2_data_country_code;
>         }
>
>         location = /static {
>             return 200 XX;
>         }
>
> and to try benchmarking them with something like wrk.
>
> --
> Maxim Dounin
> http://nginx.org/
>
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