Re: devel/pcre: enable jit?

["Sergey A. Osokin" <osa%NetBSD.org@localhost>]

On Thu, Mar 17, 2022 at 08:11:37AM -0400, Greg Troxel wrote:
> "Sergey A. Osokin" <osa%NetBSD.org@localhost> writes:
> 
> > hope you're doing well these days.
> > I've just realized that jit is disabled for devel/pcre.
> > In FreeBSD ports tree jit is enabled for various platforms, i.e.:
> >
> > .if ${ARCH} != "sparc64" && empty(ARCH:Mmips64*) && empty(ARCH:Mriscv64*)
> > CONFIGURE_ARGS+=        --enable-jit
> > .else
> > CONFIGURE_ARGS+=        --disable-jit
> > .endif
> 
> That looks like enabled except for 3, which seems like a clue that not
> very many platforms are used with FreeBSD ports, but maybe I'm
> misreading.
> 
> > Is it good idea to enable the feature for some platforms?
> 
> Perhaps, but
> 
>   1) On which platforms did you enable and test, and how did it go in general?

I have the one at the moment, and it's amd64.

>   2) Did you measure it to be faster?

Personally not, but there're many articles and blog posts about performance
improvement when pcre configures and compiles with --enable-jit option.

>   3) Did you run the included selftests and do they still pass?  Did you
>   build things that use it and run their tests?

For selftests - since those are included into a distribution, I believe
the vendor executes those for every new release.

>   4) Do you understand how the jit interacts with paxctl?  For guile
>   3.0, there is a compiler, and we have, so far, had to disable
>   MPROTECT.  I wonder what your experience was.

Nope, I have no experience with that.

-- 
Sergey A. Osokin