Re: Re: APC - User Cache Entries Vanish Upredictably

-----Original Message----- <snip> >> Anyone know anything about this type of issue? > >Not that I'm aware of this problem at all. Can you give me more >information on your set-up so that I can try to reproduce the >issues? My test set up is as follows > >Ubuntu 8.04/32 bit + apache2 + (prefork mpm?) + 5.3.6-dev mod_php5.so > >which I tested with apc-3.0.19 and 3.1.x branches. > >Cheers, >Gopal > > > >-- >PECL development discussion Mailing List (http://pecl.php.net/) >To unsubscribe, visit: http://www.php.net/unsub.php > Sure. It is happening most predictably on a pair of production servers as follows: Ubuntu 8.04 / 64 bit Apache2 2.2.8; prefork PHP 5.2.4 (shared) (5.2.4-2ubuntu5.3) APC 3.0.19 configured as follows: apc.cache_by_default 1 apc.coredump_unmap 0 apc.enable_cli 0 apc.enabled 1 apc.file_update_protection 2 apc.filters apc.gc_ttl 3600 apc.include_once_override 0 apc.max_file_size 1M apc.mmap_file_mask apc.num_files_hint 1000 apc.report_autofilter 0 apc.rfc1867 0 apc.rfc1867_freq 0 apc.rfc1867_name APC_UPLOAD_PROGRESS apc.rfc1867_prefix upload_ apc.shm_segments 1 apc.shm_size 30 apc.slam_defense 0 apc.stat 1 apc.stat_ctime 0 apc.ttl 0 apc.user_entries_hint 4096 apc.user_ttl 0 apc.write_lock 1 APC cache currently running at about 50% full; 99+% hit rate. This problem happens when adding keys (under load) to the User Cache following a "Clear User Cache" request. Keys are set to "no timeout" yet are removed almost immediately resulting in the application continuing to repopulate them. This seems to stabilize between 10-15 minutes following the user-cache flush; at which point the entries seem to hang around normally. Apache error logs show nothing APC related. Interestingly, using apc.php, it shows apc running for significantly less time than apache has been running (apc=2days, apache=30days). I think this may be related to a full cache-flush, however. If you need more info, let me know. Any suggestions would be appreciated.