Hi Nathan, Thanks for the advice. I don't think that cache getting too full is the problem because the system cache only got less than 10% full at the most. On another note, thanks for letting me know about the PECL dev list. I didn't realize that that list exists. I just sent my email to the PECL list. Maybe they can help me out there. David On Wed, Sep 10, 2008 at 11:17 PM, Nathan Nobbe <quickshiftin@xxxxxxxxx>wrote: > > > On Wed, Sep 10, 2008 at 11:38 PM, David Park <dparkmit@xxxxxxxxx> wrote: > >> Hi All, >> >> I just installed APC on my server that is running PHP and the APC appears >> to >> be randomly crashing. Below are the symptoms that my server is >> experiencing >> and the configuration of my system. Has anyone seen this type of problem >> with APC and can you give me any advice to fix it? >> >> *Symptom #1 - APC appears to be stable but then restarts after a couple >> hours with no page requests* >> 1. Reboot server >> 2. Load apc.php. It shows that the cache is empty except for one or two >> system files. These are the files that are used to create the apc.php >> page. >> 3. Load some other PHP pages. And re-load apc.php after each pageview. >> The >> cache starts filling up with other cached items and the hit rate goes up. >> 4. Leave the server alone for a couple hours. >> 5. Load apc.php. It shows that the cache is empty. Also, the cache >> uptime >> is less than an hour - in other words, the cache appears to have restarted >> itself. > > > just curious, but have you really seen a reset after a couple of hours of > *inactivity* ? i used to monitor apc.php closely when we deployed it at my > last job and every time it got past the size of the cache limit; it would > purge the cache. i think thats very common. how many files are you trying > to cache? we needed to allocate roughly 200MB of memory for apc on our > production box to keep somewhere around 1000 files worth of opcode cache in > memory. obviously theres no standard for files but thats how it worked for > us. > > you can write a test script (javascript) to run through and start > requesting all the various files from your webserver; then apc will cache > them, and you can see how many it can hold before the cache needs to be > purged. > > >> *Symptom #2 - APC restarts in the middle of serving some pages* >> 1. Reboot server >> 2. Load apc.php. It shows that the cache is empty except for one or two >> system files. These are the files that are used to create the apc.php >> page. >> 3. Load some other PHP pages. And re-load apc.php after each pageview. >> The >> cache starts filling up with other cached items and the hit rate goes up. >> 4. On some of the PHP pages, however, apc.php shows that the cache has >> emptied and has started again. >> > > the only reason i know apc would purge the cache is reaching the limit on > cache size and then getting requests to cache new files. there may be other > reasons it will automatically purge itself, and that could be something > worth asking on an apc dev list. one thing you might try is adding some > user variables to the cache via the apc api, http://us.php.net/apc, maybe > you could check to see if those get cleared along w/ the opcode cache. i > dunno if it really matters, but it could be interesting. > > -nathan >
