ngx.re.match and PCRE JIT

rezaee.hadi · 2019-05-11T04:22:42+00:00

Hi Thibault,Thanks for the info.It makes sense it was discussed before, but googling for "access_by_lua chain" and "access_by_lua multiple&quo...

ngx.re.match and PCRE JIT

rezaee.hadi

Hello there,

Well, I've used openresty/nginx in an recent deployment and I have called "ngx.re.match" with regex in several places.

For more optimization, I set "jo" in 'options' parameter. I can tell the installed PCRE is already 8.40+ , however i'm not sure which 'config options' has been used for installed PCRE package so i cannot tell for sure if it is built with "--enable-jit".

In other hand, after using "jo" in options parameter, the nginx server and the configurations looks fine and running good.

So, I was wondering how can i be sure if openresty could make the best use of PCRE JIT or not .

Thanks.

rpaprocki

Hi,

If the PCRE linked to Nginx hasn't been compiled with JIT, the 'j' option will be silently ignored. The 'o' option will still be used, as it doesn't require PCRE JIT (it's a Lua-land optimization).

Have a read of https://www.cryptobells.com/building-openresty-with-pcre-jit/ that details building and verifying PCRE JIT functionality with OpenResty.

On Fri, May 10, 2019 at 1:22 PM Hadi Rezaee <rezae...@gmail.com> wrote:

Hello there,

Well, I've used openresty/nginx in an recent deployment and I have called "ngx.re.match" with regex in several places.
For more optimization, I set "jo" in 'options' parameter. I can tell the installed PCRE is already 8.40+ , however i'm not sure which 'config options' has been used for installed PCRE package so i cannot tell for sure if it is built with "--enable-jit".

In other hand, after using "jo" in options parameter, the nginx server and the configurations looks fine and running good.
So, I was wondering how can i be sure if openresty could make the best use of PCRE JIT or not .

Thanks.

.

rezaee.hadi

Thanks alot for reply and the link :)

On Friday, May 10, 2019 at 10:55:13 PM UTC+2:30, rpaprocki wrote:

Hi,

If the PCRE linked to Nginx hasn't been compiled with JIT, the 'j' option will be silently ignored. The 'o' option will still be used, as it doesn't require PCRE JIT (it's a Lua-land optimization).

Have a read of https://www.cryptobells.com/building-openresty-with-pcre-jit/ that details building and verifying PCRE JIT functionality with OpenResty.

On Fri, May 10, 2019 at 1:22 PM Hadi Rezaee <rezae...@gmail.com> wrote:
Hello there,

Well, I've used openresty/nginx in an recent deployment and I have called "ngx.re.match" with regex in several places.
For more optimization, I set "jo" in 'options' parameter. I can tell the installed PCRE is already 8.40+ , however i'm not sure which 'config options' has been used for installed PCRE package so i cannot tell for sure if it is built with "--enable-jit".

In other hand, after using "jo" in options parameter, the nginx server and the configurations looks fine and running good.
So, I was wondering how can i be sure if openresty could make the best use of PCRE JIT or not .

Thanks.

.