Daniel, Unfortunately, *real* perl thread shared data isn't shared globally (among all processes) in a forking environment like that of mod_perl in Apache. The single-process nature of native ithreads makes perl shared variables reasonably impractical to use in a mod_perl environment.
Given the described design issue, only an IPC model would work, such as SysV shared memory, BerkeleyDB, or an in-memory TCP cache like memcached. forks::BerkeleyDB is an attempt to abstract IPC into an ithreads enviroment, allowing a preforking mod_perl environment behave as a single thread group using BerkeleyDB as the underlying IPC model. -Eric --- Daniel Rychlik <[EMAIL PROTECTED]> wrote: > solution The best would be *real* > threads with really shared variables, but this is another topic ;-) > > No kidding... > -------------------------- > Respectfully, > Dan Rychlik > IT Projects Engineer > > > > -----Original Message----- > From: Alvar Freude <[EMAIL PROTECTED]> > To: Eric Rybski <[EMAIL PROTECTED]>; perl-ithreads@perl.org > <perl-ithreads@perl.org> > Sent: Wed Jul 04 12:11:56 2007 > Subject: Re: forks: shared variables between different applications > or hosts > > > Hi, > > -- Eric Rybski <[EMAIL PROTECTED]> wrote: > > > If you are using mod_perl 1.0, or mod_perl 2.0 with the 'prefork' > MPM, > > I have successfully worked with a few companies to integrate forks > into > > Apache httpd instances. Additionally, if you use the > forks::BerkeleyDB > > add-on, you'll get excellent shared variable access performance > (which > > sounds like a requirement for your 100MB of data). > > hmmm, for a typical page I need between 50 and 1000 hash lookups. And > > sometimes more and sometimes fewer. But I'll make some tests: if this > is > fast enough, it seems to be a very good solution The best would be > *real* > threads with really shared variables, but this is another topic ;-) > > > > I haven't yet posted Apache::forks to CPAN, but if you're > interested in > > evaluating it, I'll be happy to e-mail you a stable pre-release > that > > works with forks 0.23 and forks::BerkeleyDB 0.05. > > OK -- first I'll do some benchmarks to test if it might work. > I think it would be the easyest and best way to do it, if fast > enough! > > > Thanks && Ciao > Alvar > > > -- > ** Alvar C.H. Freude, http://alvar.a-blast.org/ > **�http://www.assoziations-blaster.de/ > ** http://www.wen-waehlen.de/ > ** http://odem.org/ >
