Re: [Pas-dev] Apache, mod_perl and Preloading?

[Kyle R . B. <mo...@vo...>]

> > Are not PSP files mostly content?  Or at least commonly mostly content?
> 
> Well, yes. But most of the psp's I've written are small. So the memory
> usage was reasonable. A psp with a bunch of huge tables with a ton of
> content could get out of hand quickly. I can see why you're going down the
> preload path. 

Even with smaller psps, the code they compile into should still be shared.

> > Ah.  So pre-compilation and disabling dynamic-recompliation and StatInc
> > should be _good_ things?
> 
> Yes. Very good things. 

Good.

> > Wouldn't the pre-compile/pre-load provide both a performance boost and
> > a memory reduction (for the child processes)?  There is an obvious 
> > overhead associated with pre-loading infrequently hit parts of the 
> > site/codebase, but unless the bulk of your site is mostly infrequently 
> > hit stuff, then pre-loading should be a win (both cpu and memory) right?
> 
> THis is where it gets interresting. There's really one way to tell.
> Benchmarks :)

Yes.  I don't have the time or resources to do proper benchmarks right
now though.

> > Hrm...that's an interesting possibility.  Combiend with earlier
> > proposals of compile-time (psp compile time) expansion of psp code
> > into static content, that could provide more winnage...
> 
> Well, yes. Sort of. Depending.... I have a funny feeling we're about to
> reinvent SSI :)

Nope.  This has nothing to do with SSI or it's aproach IMO.



> Cool, let me know how it goes. 

I just checked in a build-startup.pl that uses File::Find on the
pas.documentRoot in the configuration file, and compiles all psp files
that don't start with an underscore (that's just a convention that
we've been using for included psp files, which might not result
in a valid .pm file after compilaion).

If your codebase compiles properly, that code compmiles every psp
file at Apache startup and pre-loads it.  I need to move the 
conditional recompile check logic out of the request handler and
into the psp compiler...so it can get reused by the build-startup.pl


Other than that, it looks like it works.

One thing is that the .pm files generated from the .psp files end 
up being owned by root.

Kyle

-- 

------------------------------------------------------------------------------
Wisdom and Compassion are inseparable.
        -- Christmas Humphreys
mo...@vo...                            http://www.voicenet.com/~mortis
------------------------------------------------------------------------------