ngx.var.VARIABLE vs ngx.arg[] - any difference in performance ?

ddragosd · 2014-11-12T02:06:42+00:00

> [1] https://github.com/openresty/lua-nginx-module#ngxctx I've completely missed this part. Thank you! This is exactly what I needed :)

ngx.var.VARIABLE vs ngx.arg[] - any difference in performance ?

ddragosd

Hi,

I'm wondering if there's a significant difference in performance between the next 2 lines, in the light that ngx.var.VARIABLE is not so optimal:

set_by_lua $myvar 'return ngx.re.gsub(ngx.arg[1], "source", "replace", "ijo") ' $myvar;

set_by_lua $myvar 'return ngx.re.gsub(ngx.var.myvar, "source", "replace", "ijo") ';

Thanks,

Dragos

agentzh

Hello!

On Tue, Nov 11, 2014 at 10:06 AM, Dragos Dascalita Haut wrote:
> I'm wondering if there's a significant difference in performance between the
> next 2 lines, in the light that ngx.var.VARIABLE is not so optimal:
>
> set_by_lua $myvar 'return ngx.re.gsub(ngx.arg[1], "source", "replace",
> "ijo") ' $myvar;
> vs
> set_by_lua $myvar 'return ngx.re.gsub(ngx.var.myvar, "source", "replace",
> "ijo") ';
>

For this very case, it should be very similar. Also, it's always best
to benchmark things yourself (and I'd be surprised if you find
measurable differences).

Regards,
-agentzh