Zend Optimizer+ - Configuration Directives

Configuration Directives Summary

Directive	Type	Modification Scope	Description
zend_optimizerplus.enable	boolean	PHP_INI_SYSTEM	Optimizer+ On/Off switch. When set to Off, code is not optimized.
zend_optimizerplus.use_cwd	boolean	PHP_INI_SYSTEM	If set to On, use the current directory as a part of the script key
zend_optimizerplus.validate_timestamps	boolean	PHP_INI_ALL	If enabled, the Optimizer+ checks the file timestamps and updates the cache accordingly.
zend_optimizerplus.revalidate_freq	integer	PHP_INI_ALL	How often to check file timestamps for changes to the shared memory storage allocation.
zend_optimizerplus.revalidate_path	boolean	PHP_INI_ALL	Enables or disables file search in include_path optimization
zend_optimizerplus.inherited_hack	boolean	PHP_INI_SYSTEM	Enable this hack as a workaround for "can't redeclare class" errors
zend_optimizerplus.dups_fix	boolean	PHP_INI_ALL	Enable this hack as a workaround for "duplicate definition" errors
zend_optimizerplus.log_verbosity_level	integer	PHP_INI_SYSTEM	The verbosity of the Optimizer+ log
zend_optimizerplus.memory_consumption	integer	PHP_INI_SYSTEM	The Optimizer+ shared memory storage size. The amount of memory for storing precompiled PHP code in Mbytes.
zend_optimizerplus.max_accelerated_files	integer	PHP_INI_SYSTEM	The maximum number of keys (scripts) in the Optimizer+ hash table
zend_optimizerplus.max_wasted_percentage	integer	PHP_INI_SYSTEM	The maximum percentage of "wasted" memory until a restart is scheduled
zend_optimizerplus.consistency_checks	integer	PHP_INI_ALL	Check the cache checksum each N requests
zend_optimizerplus.force_restart_timeout	integer	PHP_INI_SYSTEM	How long to wait (in seconds) for a scheduled restart to begin if the cache is not being accessed
zend_optimizerplus.blacklist_filename	string	PHP_INI_SYSTEM	The location of the Optimizer+ blacklist file
zend_optimizerplus.save_comments	boolean	PHP_INI_SYSTEM	If disabled, all PHPDoc comments are dropped from the code to reduce the size of the optimized code.
zend_optimizerplus.fast_shutdown	boolean	PHP_INI_SYSTEM	If enabled, a fast shutdown sequence is used for the accelerated code
zend_optimizerplus.optimization_level	integer	PHP_INI_SYSTEM	A bitmask, where each bit enables or disables the appropriate Optimizer+ passes
zend_optimizerplus.enable_slow_optimizations	boolean	PHP_INI_SYSTEM	Enables or disables the optimization passes that may take significant time, based on an internal runtime calculation

External Configuration File: Optimizer+ blacklist file

The Optimizer+ blacklist file is a text file that holds the names of files that should not be accelerated. The file format is to add each filename to a new line. The filename may be a full path or just a file prefix (i.e., /var/www/x blacklists all the files and directories in /var/www that start with 'x'). Files are usually triggered by one of the following three reasons: 1) Directories that contain auto generated code, like Smarty or ZFW cache. 2) Code that does not work well when accelerated, due to some delayed compile time evaluation. 3) Code that triggers an Optimizer+ bug.

Configuration Directive Details

zend_optimizerplus.enable

Optimizer+ On/Off switch. When set to Off, code is not optimized.

Type: boolean

Default Value: 1

Available since version 4.0

zend_optimizerplus.use_cwd

When this directive is enabled, the Optimizer+ appends the current working directory to the script key, thus elminating possible collisions between files with the same name (basename). Disablingthe directive improves performance, but may break existing applications.

Type: boolean

Default Value: 1

Available since version 4.0

zend_optimizerplus.validate_timestamps

When disabled, you must reset the Optimizer+ manually or restart the webserver for changes to the filesystem to take effect. The frequancy of the check is controlled by the directive "zend_optimizerplus.revalidate_freq"

Type: boolean

Default Value: 1

Available since version 4.0

zend_optimizerplus.revalidate_freq

How often to check file timestamps for changes to the shared memory storage allocation.

Type: integer

Units: seconds

Default Value: 2

Available since version 4.0

zend_optimizerplus.revalidate_path

If the file search is disabled and a cached file is found that uses the same include_path, the file is not searched again. Thus, if a file with the same name appears somewhere else in include_path, it won't be found. Enable this directive if this optimization has an effect on your applications. The default for this directive is disabled, which means that optimization is active.

Type: boolean

Default Value: 0

Available since version 4.0

zend_optimizerplus.inherited_hack

The Optimizer+ stores the places where DECLARE_CLASS opcodes use inheritance (These are the only opcodes that can be executed by PHP, but which may not be executed because the parent class is missing due to optimization). When the file is loaded, Optimizer+ tries to bind the inherited classes by using the current environment. The problem with this scenario is that, while the DECLARE_CLASS opcode may not be needed for the current script, if the script requires that the opcode at least be defined, it may not run. The default for this directive is disabled, which means that optimization is active.

Type: boolean

Default Value: 1

Available since version 4.0

zend_optimizerplus.dups_fix

Enable this hack as a workaround for "duplicate definition" errors

Type: boolean

Default Value: 0

Available since version 4.0

zend_optimizerplus.log_verbosity_level

All Optimizer+ errors go to the Web server log. By default, only fatal errors (level 0) or errors (level 1) are logged. You can also enable warnings (level 2), info messages (level 3) or debug messesges (level 4). For "debug" binaries, the default log verbosity level is 4, not 1.

Type: integer

Default Value: 1

Available since version 4.0

zend_optimizerplus.memory_consumption

The Optimizer+ shared memory storage size. The amount of memory for storing precompiled PHP code in Mbytes.

Type: integer

Units: MBytes

Default Value: 64

Available since version 4.0

zend_optimizerplus.max_accelerated_files

The number is actually the the first one in the following set of prime numbers that is bigger than the one supplied: { 223, 463, 983, 1979, 3907, 7963, 16229, 32531, 65407, 130987 }. Only numbers between 200 and 100000 are allowed.

Type: integer

Default Value: 2000

Available since version 4.0

zend_optimizerplus.max_wasted_percentage

The maximum percentage of "wasted" memory until a restart is scheduled

Type: integer

Units: %

Default Value: 5

Available since version 4.0

zend_optimizerplus.consistency_checks

The default value of "0" means that the checks are disabled. Because calculating the checksum impairs performance, this directive should be enabled only as part of a debugging process.

Type: integer

Default Value: 0

Available since version 4.0

zend_optimizerplus.force_restart_timeout

The Optimizer+ uses this directive to identify a situation where there may be a problem with a process. After this time period has passed, the Optimizer+ assumes that something has happened and starts killing the processes that still hold the locks that are preventing a restart. If the log level is 3 or above, a "killed locker" error is recorded in the Apache logs when this happens.

Type: integer

Units: seconds

Default Value: 180

Available since version 4.0

zend_optimizerplus.blacklist_filename

For additional information, see "Extermal Configuration File", above

Type: string

Available since version 4.0

zend_optimizerplus.save_comments

If disabled, all PHPDoc comments are dropped from the code to reduce the size of the optimized code.

Type: boolean

Default Value: 1

Available since version 4.0

zend_optimizerplus.fast_shutdown

The fast shutdown sequence doesn't free each allocated block, but lets the Zend Engine Memory Manager do the work.

Type: boolean

Default Value: 0

Available since version 4.0

zend_optimizerplus.optimization_level

A bitmask, where each bit enables or disables the appropriate Optimizer+ features (where 0 is disabled and 1 is enabled).

Type: integer

Default Value: 0xfffffbbf

Available since version 4.0

The following is a list of each bit represented in the value :

bit 0 - Enables/disables optimization step 1:

CSE - constants subexpressions elimination
Sequences of ADD_CHAR/ADD_STRING optimization

bit 1 - Enables/disables optimization step 2:

Convert constant operands to expected types
Convert conditional jumps with constant operands
Optimize static BRK and CONT

bit 2 - Enables/disables optimization step 3:

Convert $a = $a + expr into $a += expr
Convert $a++ into ++$a
Optimize series of JMPs

bit 3 - Enables/disables optimization step 4:

PRINT and ECHO optimization

bit 4 - Enables/disables optimization step 5:

block optimization (the most expensive optimization pass which perform many different optimization patterns based on CFG - control flow graph)

bit 8 - Enables/disables optimization step 9:

bit 9 - Enables/disables optimization step 10:

remove NOPs

zend_optimizerplus.enable_slow_optimizations

Enables or disables the optimization passes that may take significant time, based on an internal runtime calculation

Type: boolean

Default Value: 1

Available since version 4.0

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