Hi,
I just switch my apache to use the worker MM.
I have a filter which uses Cache::SharedMemoryCache to share data between process (and hopefully threads now).
A simple example is this: --- use Cache::SharedMemoryCache; $cache = new Cache::SharedMemoryCache( { namespace => 'my namespace', } ); -----
This will result the error: [Mon Dec 29 17:48:31 2003] [error] [client xxx.xxx.xxx.xxx] Object #260 should have been retrieved already at ../../lib/Stora ble.pm (autosplit into ../../lib/auto/Storable/thaw.al) line 358, at /usr/lib/perl5/site_perl/5.8.0/Cache/CacheUtils.pm line 121
After this I switched back to a apache pre-fork MM and the problem continued.
As Cache::SharedMemoryCache is process independent, even a small script generate this error.
Later, I switched one more time to apache MM worker and restarted the server machine.
Everything worked fine.
Does anyone have a clue why this happened?
Is it possible that it's an issue Jan has mentioned yesterday:
http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2003-12/msg00994.html
since it uses PL_modglobal which is not properly CLONEd on perl_clone (used under threaded mpms). What happens if you patch Storable.xs the way Jan explained and rebuild/install it?
Perrin Harkins wrote: > You could also try to just share variables between the threads, which is > the only way to share without using Storable. The trouble is, objects are > not easy to share in this way, and any performance you gain may be > cancelled out by the generally poor performance of Perl threads.
s/generally poor performance of Perl threads/poor performance of starting new Perl threads/, otherwise the runtime performance is not any different from normal Perl.
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