eAccelerator for PHP
What is eAccelerator?
eAccelerator is a free open source PHP accelerator and optimizer for PHP. It
increases the performance of PHP scripts by caching them in compiled state,
so the overhead of compiling is almost completely eliminated. It also
optimizes the scripts to speed up execution.
eAccelerator typically reduces server load and increases the speed of your
PHP code by 1-10 times.
eAccelerator is a fork of TurckMMCache
( http://sourceforge.net/project/turckmm-cache/ by Dmitry Stogov )
eAccelerator stores compiled PHP scripts in shared memory and executes code
directly from it. It creates locks only for short time, while searching
compiled PHP script in the cache, so one script can be executed simultaneously
by several engines. Files that can't fit in shared memory are cached on disk
eAccelerator is compatible with Zend Optimizer's loader. Zend Optimizer must
be installed after eAccelerator in php.ini. If you don't use scripts encoded
with Zend Encoder we do not recommend to install Zend Optimizer with
eAccelerator does not work in CGI mode but it does work in FastCGI mode with
webservers like lighttpd or using php-fpm.
Latest eAccelerator versions can be downloaded at the sourceforge page:
Development snapshots from cvs can be downloaded at
* apache >= 1.3, mod_php >= 5.1 or php with fastcgi support
* autoconf, automake, libtool, m4
eAccelerator works with php version 5.1 and higher.
It is being used on Linux, FreeBSD, Mac OS X, Solaris and Windows
with Apache 1.3 and 2, lighttpd, php-fpm and IIS.
You can find more information about the installation of eAccelerator on our
website at http://www.eaccelerator.net/
Note(1): for Microsoft Windows installation, please refer to README.win32 file.
Step 1. Compiling eAccelerator
You must specify the real prefix where PHP is installed in the "export"
command. It may be "/usr" "/usr/local", or something else.
Step 2. Installing eAccelerator
Step 3. Configuring eAccelerator
eAccelerator can be installed both as Zend or PHP extension.
For eaccelerator > 0.9.1, if you have /etc/php.d directory, you should copy eaccelerator.ini inside and modify default value if you need.
If not, you need to edit your php.ini file (usually /etc/php.ini).
To install as Zend extension:
If you use thread safe build of PHP you must use "zend_extension_ts" instead
To install as PHP extension:
Step 4. Creating cache directory
chmod 0777 /tmp/eaccelerator
The amount of shared memory (in megabytes) that eAccelerator will use.
"0" means OS default. Default value is "0".
The directory that is used for disk cache. eAccelerator stores precompiled
code, session data, content and user entries here. The same data can be
stored in shared memory also (for more quick access). Default value is
Enables or disables eAccelerator. Should be "1" for enabling or "0" for
disabling. Default value is "1".
Enables or disables internal peephole optimizer which may speed up code
execution. Should be "1" for enabling or "0" for disabling. Default value
Enables or disables debug logging. Should be "1" for enabling or "0" for
disabling. Default value is "0".
Enables or disables PHP file modification checking . Should be "1" for
enabling or "0" for disabling. You should set it to "1" if you want to
recompile PHP files after modification. Default value is "1".
Determine which PHP files must be cached. You may specify the number of
patterns (for example "*.php *.phtml") which specifies to cache or not to
cache. If pattern starts with the character "!", it means to ignore files
which are matched by the following pattern. Default value is "" that means
all PHP scripts will be cached.
When eaccelerator fails to get shared memory for new script it removes all
scripts which were not accessed at last "shm_ttl" seconds from shared
memory. Default value is "0" that means - don't remove any files from
When eaccelerator fails to get shared memory for new script it tryes to
remove old script if the previous try was made more then
"shm_prune_period" seconds ago. Default value is "0" that means - don't
try to remove any files from shared memory.
Enables or disables caching of compiled scripts on disk. It has no effect
on session data and content caching. Default value is "0" that means - use
disk and shared memory for caching.
The script paths that are allowed to get admin information and do admin
Control panel and disassembler
If you want to use the control-panel you need to compile eAccelerator with
--with-eaccelerator-info which is the default value.
You need to copy the control.php file to your webroot and set the path to it
in the php.ini or eaccelerator.ini in the eaccelerator.allowed_admin_path
directive. If you don't do this you wont be able to see much information and
can't control eAccelerator.
You can set the username and password needed to access the control-panel in
the control.php file. By default the username is administrator and the password
When you compile eAccelerator with --with-eaccelerator-disassembler you need
to place the dasm.php and PHP_Highlight.php file also in the same directory
as the control.php file. The disassembler requires PHP to be compiled with
tokenizer support (--enable-tokenizer).
You can set the username and password needed to access the disassembler at the
top of dasm.php.
You can contact us with questions, patches or bugs on GitHub