The behaviour of these functions is affected by settings in
Although the default APCu settings are fine for many installations, serious users should consider tuning the following parameters.
There is one decision to be made configuring APCu.
How much memory is going to be allocated to APCu.
The ini directive that controls this is
Read the sections on this carefully below.
Once the server is running, the
apc.php script that
is bundled with the extension should be copied somewhere into the docroot and
viewed with a browser as it provides a detailed analysis of the internal
workings of APCu. If GD is enabled in PHP, it will even display some
interesting graphs. If APCu is working, the
Cache full count number (on the left) will display the number of times the cache
has reached maximum capacity and has had to forcefully clean any entries that
haven't been accessed in the last
apc.ttl seconds. This
number is minimized in a well-configured cache. If the cache is constantly
being filled, and thusly forcefully freed, the resulting churning will have
disparaging effects on script performance. The easiest way to minimize this
number is to allocate more memory for APCu.
When APCu is compiled with mmap support (Memory Mapping), it will use only one
memory segment, unlike when APCu is built with SHM (SysV Shared Memory) support
that uses multiple memory segments. MMAP does not have a maximum limit like SHM
/proc/sys/kernel/shmmax. In general MMAP support is
recommended because it will reclaim the memory faster when the webserver is
restarted and all in all reduces memory allocation impact at startup.
For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set. Here's a short explanation of the configuration directives.
apc.enabled can be set to 0 to disable APC. This is
primarily useful when APC is statically compiled
into PHP, since there is no other way to disable
it (when compiled as a DSO, the
php.ini can just be commented-out).
The number of shared memory segments to allocate
for the compiler cache. If APC is running out of
shared memory but
is set as high as the system allows, raising
this value might prevent APC from exhausting its memory.
The size of each shared memory segment given by a shorthand notation as described in this FAQ. By default, some systems (including most BSD variants) have very low limits on the size of a shared memory segment.
A "hint" about the number of distinct variables that might be stored. Set to zero or omit if not sure.
The number of seconds a cache entry is allowed to idle in a slot in case this cache entry slot is needed by another entry. Leaving this at zero means that APC's cache could potentially fill up with stale entries while newer entries won't be cached. In the event of a cache running out of available memory, the cache will be completely expunged if ttl is equal to 0. Otherwise, if the ttl is greater than 0, APC will attempt to remove expired entries.
The number of seconds that a cache entry may remain on the garbage-collection list. This value provides a fail-safe in the event that a server process dies while executing a cached source file; if that source file is modified, the memory allocated for the old version will not be reclaimed until this TTL reached. Set to zero to disable this feature.
If compiled with MMAP support by using
this is the mktemp-style file_mask to pass to the
mmap module for determining whether your mmap'ed memory
region is going to be file-backed or shared memory
backed. For straight file-backed mmap, set it to
To use POSIX-style shm_open/mmap put a
somewhere in your mask. e.g.
You can also set it to
/dev/zero to use your
/dev/zero interface to anonymous mmap'ed
memory. Leaving it undefined will force an anonymous mmap.
On very busy servers whenever you start the server or
modify files you can create a race of many processes
all trying to cache the same file at the same time.
This option sets the percentage of processes that will
skip trying to cache an uncached file. Or think of it
as the probability of a single process to skip caching.
For example, setting
75 would mean that there is
a 75% chance that the process will not cache an uncached
file. So, the higher the setting the greater the defense
against cache slams. Setting this to
disables this feature.
Mostly for testing and debugging. Setting this enables APC for the CLI version of PHP. Under normal circumstances, it is not ideal to create, populate and destroy the APC cache on every CLI request, but for various test scenarios it is useful to be able to enable APC for the CLI version of PHP easily.
Used to configure APC to use a third party serializer.
Enables APC handling of signals, such as SIGSEGV, that write core files when signaled. When these signals are received, APC will attempt to unmap the shared memory segment in order to exclude it from the core file. This setting may improve system stability when fatal signals are received and a large APC shared memory segment is configured.
This feature is potentially dangerous. Unmapping the shared memory segment in a fatal signal handler may cause undefined behaviour if a fatal error occurs.
Although some kernels may provide a facility to ignore various types of shared memory when generating a core dump file, these implementations may also ignore important shared memory segments such as the Apache scoreboard.
Optionally, set a path to the directory that APC will load cache data at startup.
Use the SAPI request start time for TTL.