Re: caching questions
On Tue, 22 Jul 2003 13:05:00 +0300, Stas Bekman wrote: Peter Haworth wrote: Cache::Mmap (which I wrote) isn't threadsafe, but should work OK in a forking MPM. If anyone wants to contribute code to make it threadsafe (preferably without impacting single-threaded performance too much), I'll be very grateful. I'd do it myself, but I've never used threads, so I'm bound to get it wrong. I haven't looked at the module's implementation, but if you have a C-level thread-safety issues, you may consider using libapr which provides a thread-safe mmap API. No, it's perl-level stuff at the point that matters. Currently, it uses fine grained file locking to prevent concurrent accesses from other processes, but as far as I understand it, this won't prevent concurrent accesses from other threads in the same process. -- Peter Haworth [EMAIL PROTECTED] Do you expect me to implement it? No, Mister Schwern, I expect you to DIE! -- Michael G Schwern in p5p
Re: caching questions
Sorry to step in here, but could I use any of the caching modules you mentionned in mod_perl2? thx tom Am Mon, 2003-07-21 um 21.45 schrieb Perrin Harkins: On Sun, 2003-07-20 at 15:47, Patrick Galbraith wrote: One thing that my code does is check to see if it's cache has been updated to the db, which I wish I could really have some sort of cache that's in one place in memory (as opposed to each child process). Well, you can't, unless you use threads. I know there's IPC, and also memcached. I've used IPC::Shareable before, but don't know if that's the route I'd wanna go. It's not. IPC::Shareable is very slow. If you want to share data, use Cache::FileCache, Cache::Mmap, MLDBM::Sync, or IPC::MM. Has anyone implemented a good caching system that sets up a global cache that you don't have to check constantly because you happen to have been served out by a child that doesn't have the latest cache from DB? One single memory object? The systems I listed above all use a shared cache that will have the same data regardless of which process accesses it. - Perrin
Re: caching questions
On Tue, 2003-07-22 at 02:13, Tom Schindl wrote: Sorry to step in here, but could I use any of the caching modules you mentionned in mod_perl2? I can't vouch for the thread safety of these modules, but all of them should work in prefork mode. - Perrin
