A few updates on what happens on the perl threads scaling issues front.
If you remember perl threads are painfully slow to start if you have lots of modules loaded, since the perl threading model is based on cloning all variables, but sharing the op-code tree. So on the loaded machine it's
prohibitively slow.
But things are slowly improvement:
1) Nicholas has committed a code that speeds up the threads cloning by 10%, so it should be out in perl 5.8.7
2) Nicholas is still working on COW (copy-on-write), which should significantly improve the performance, as it will work somewhat similar to the fork()'s COW.
3) I'm working on thread-safety issues with mp2 API, you can try the new branch which will require perl 5.8.7 or higher:
https://svn.apache.org/repos/asf/perl/modperl/branches/clone-skip-unstable/
(as 5.8.7 wasn't released you will need to use the maint branch, which you can retrieve via:
rsync -acvz --delete --force rsync://ftp.linux.activestate.com/perl-5.8.x ./perl-5.8.7
4) And finally there are people who run threaded mpm mod_perl 2 in production. Their solution is to ensure that they spawn all the needed perl interpreters at the server startup, which is slow, but once the server is up, things are running fast (since no new interpreters are started). And they advise on having at least 2gb ram dual xeon.
Thanks to Autrijus to this update.
-- __________________________________________________________________ Stas Bekman JAm_pH ------> Just Another mod_perl Hacker http://stason.org/ mod_perl Guide ---> http://perl.apache.org mailto:[EMAIL PROTECTED] http://use.perl.org http://apacheweek.com http://modperlbook.org http://apache.org http://ticketmaster.com
