3 free PHP accelerators: APC, eAccelerator, and XCache comparison

Three free PHP accelerator: APC, eAccelerator, XCache comparison this article reposted from: http://killker.com/blog? P = 94 I 've been searching for some articles about PHP acceleration. I 've accidentally seen this article about killing customers. I feel good. I 'd like to share it with you. Here are three free PHP accelerators: comparison of APC, eAccelerator, and XCache

This article reprinted from: http://killker.com/blog? P = 94

I have been searching for some articles about PHP acceleration. I am glad to share this article with you. thank you for killing me.

I. Introduction to the PHP accelerator

? The PHP accelerator is a PHP operation code cached to improve PHP execution efficiency. in this way, PHP does not need to be parsed or converted for subsequent execution. you can directly call the PHP operation code, this increases the speed.

In Apache, the execution process of requests and responses using mod_php is as follows:

1. Apache receives the request.
2. Apache sends the request to mod_php.
3. locate the disk file in mod_php and load it to the memory.
4. mod_php compiles the source code into the opcode tree.
5. run the opcode tree in mod_php.

?????? The PHP accelerator is the fourth step. its purpose is to prevent PHP code from being repeatedly compiled every time PHP requests are sent. because on high-traffic websites, a large number of compilation operations are usually not executed quickly? So the bottleneck here is that PHP's repeated compilation affects both speed and server load. to solve this problem, the PHP accelerator was born.

II. PHP accelerator installation and configuration

????????1. install and configure APC

The full name of APC is Alternative PHP Cache, which is officially translated as "optional PHP Cache". It is an extension in php pecl. it seems that facebook is using it and the following is the installation (ubuntu environment ):?
$ Wget http://pecl.php.net/get/APC-3.0.19.tgz
$ Tar xvzf APC-3.0.19.tgz
$ Cd APC-3.0.19/APC-3.0.19
$/Usr/local/php/bin/phpize
$./Configure-enable-apc-mmap-with-php-config =/usr/local/php/bin/php-config
$ Make
$ Sudo make install

Next we will configure APC again, because my PECL extension path has changed, so I have to move the compiled file:
$ Sudo mv/usr/local/php/lib/php/extension/ no-debug-non-zts-20060613/apc. so/usr/local/php/lib/php/extensions/PECL

Then edit the php. ini file for configuration. add the following code to php. ini:
Extension_dir = "/usr/local/php/lib/php/extensions/PECL"
Extension = apc. so
; APC
Apc. enabled = 1
Apc. shm_segments = 1
Apc. shm_size = 64
Apc. optimization = 1
Apc. num_files_hint = 0
Apc. ttl = 0
Apc. gc_ttl = 3600
Apc. cache_by_default = on

???? In this way, apache is restarted and displayed in phpinfo.

?????? 2. install and configure eAccelerator

The predecessor of eAccelerator is actually truck-mmcache. because the person who developed truk-mmcache was Zend to Zhaoxing, the person who developed the eAccelerator inherited some features of truk-mmcache, the eAccelerator accelerator is designed. The installation is as follows:
$ Wget http://jaist.dl.sourceforge.net/sourceforge/eaccelerator/eaccelerator-0.9.5.tar.bz2
$ Tar-jxf eaccelerator-0.9.5.tar.bz2
$ Eaccelerator-0.9.5 cd
$/Usr/local/php/bin/phpize
$./Configure-enable-eaccelerator = shared-with-php-config =/usr/local/php/bin/php-config
$ Make
$ Sudo make install
$ Sudo mv/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/eaccelerator. so/usr/local/php/lib/php/extensions/PECL

Add the following code to the php. ini file:
Extension = eaccelerator. so
; EAccelerator
Eaccelerator. shm_size = "16"
Eaccelerator. cache_dir = "/tmp/eaccelerator"
Eaccelerator. enable = "1"
Eaccelerator. optimizer = "1"
Eaccelerator. check_mtime = "1"
Eaccelerator. debug = "0"
Eaccelerator. filter = ""
Eaccelerator. shm_max = "0"
Eaccelerator. shm_ttl = "0"
Eaccelerator. prune_period = "0"
Eaccelerator. shm_only = "0"
Eaccelerator. compress = "1"
Eaccelerator. compress_level = "9"

Create cache directory and restart apache

$ Sudo mkdir/tmp/eaccelerator
$ Sudo chmod 777/tmp/eaccelerator
$ Sudo/usr/local/apache/apachectl restart

Check whether the installation is successful in phpinfo.

3. install and configure XCache

XCache is developed by Chinese people. I am also proud to be a novice, and XCache is doing well in both speed and performance. Now let's try it!

$ Wget http://xcache.lighttpd.net/pub/Releases/1.2.2/xcache-1.2.2.tar.gz
$ Tar xvzf xcache-1.2.2.tar.gz
$ Xcache-1.2.2 cd
$/Usr/local/php/bin/phpize
$./Configure-enable-xcache-coverager-with-php-config =/usr/local/php-config
$ Make
$ Sudo make install
$ Sudo mv/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/xcache. so/usr/local/php/lib/php/extensions/PECL

Add configuration information in php. ini:

Extension = xcache. so
; Xcache
Xcache. admin. user = "admin"
Xcache. admin. pass = "(execute) echo '(your password)' | md5sum (obtained ciphertext )"
;
Xcache. size = 24 M
Xcache. shm_scheme = "mmap"
Xcache. count = 2
Xcache. slots = 8 k
Xcache. ttl = 0
Xcache. gc_interval = 0

Xcache. var_size = 8 M
Xcache. var_count = 1
Xcache. var_slots = 8 k
Xcache. var_ttl = 0
Xcache. var_maxttl = 0
Xcache. var_gc_interval = 300
Xcache. test = Off
Xcache. readonly_protection = On
Xcache. mmap_path = "/tmp/xcache"
Xcache. coredump_directory = ""
Xcache. cacher = On
Xcache. stat = On
Xcache. optimizer = Off
;
Xcache. coverager = On
Xcache. coveragedump_directory = ""

Create cache directory and restart apache

$ Sudo mkdir/tmp/xcache
$ Sudo chmod 777/tmp/xcache
$ Sudo/usr/local/apache/bin/apachectl restart

Check the phpinfo () information!

III. PHP accelerator testing

1. test environment

Hardware: AMD Athlon 64X2 Dual Core Processor 4400 + @ 2.2 GHz CPU, 2 GB memory. 160 gb sata hard drive

Software: Linux Ubuntu server Gutsy 7.10, Apache 2.2.4, MySQL 5.0.45, and PHP 5.2.3

Test Command: AB-c5-n3000 http://example.com/(we are using the Apache Benchmark (AB) tool with concurrent connections of 5 to requests)

2. test results

No accelerators:

Document Path :/
Document Length: 21757 bytes
Concurrency Level: 5
Time taken for tests: 288.255212 seconds
Complete requests: 3000
Failed requests: 0
Write errors: 0
Total transferred: 66777000 bytes
HTML transferred: 65271000 bytes
Requests per secondd: 10.41 [#/sec] (mean)
Time per request: 480.425 [MS] (mean)
Time per request: 96.085 [MS] (mean, internal SS all concurrent requests)
Transfer rate: 226.23 [Kbytes/sec] canceled ed
Connection Times (MS)
Min mean [+/-sd] median max
Connect: 0 0 0.5 0 19
Processing: 181 479 186.0 444 1822
Waiting: 166 461 184.7 427
Total: 181 479 186.0 444
Percentage of the requests served within a certain time (MS)
50% 444
66% 525
75% 577
80% 619
90% 732
95% 819
98% 946
99% 1012
100% 1822 (longest request)

APC accelerator:

Document Path :/
Document Length: 21757 bytes
Concurrency Level: 5
Time taken for tests: 98.530068 seconds
Complete requests: 3000
Failed requests: 0
Write errors: 0
Total transferred: 66777000 bytes
HTML transferred: 65271000 bytes
Requests per secondd: 30.45 [#/sec] (mean)
Time per request: 164.217 [MS] (mean)
Time per request: 32.843 [MS] (mean, internal SS all concurrent requests)
Transfer rate: 661.84 [Kbytes/sec] canceled ed
Connection Times (MS)
Min mean [+/-sd] median max
Connect: 0 0 0.0 0 2
Processing: 58 163 71.2 155 2452
Waiting: 53 158 69.6 150 2329
Total: 58 163 71.2 155 2452
Percentage of the requests served within a certain time (MS)
50% 155
66% 178
75% 193
80% 204
90% 235
95% 258
98% 285
99% 302
100% 2452 (longest request)

EAccelerator accelerator:

Document Path :/
Document Length: 21757 bytes
Concurrency Level: 5
Time taken for tests: 95.983986 seconds
Complete requests: 3000
Failed requests: 0
Write errors: 0
Total transferred: 66777000 bytes
HTML transferred: 65271000 bytes
Requests per secondd: 31.26 [#/sec] (mean)
Time per request: 159.973 [MS] (mean)
Time per request: 31.995 [MS] (mean, internal SS all concurrent requests)
Transfer rate: 679.39 [Kbytes/sec] canceled ed
Connection Times (MS)
Min mean [+/-sd] median max
Connect: 0 0 0.1 0 3
Processing: 57 159 91.3 148 3830
Waiting: 50 152 89.8 142
Total: 57 159 91.3 148 3830
Percentage of the requests served within a certain time (MS)
50% 148
66% 174
75% 193
80% 205
90% 239
95% 263
98% 289
99% 309
100% 3830 (longest request)

XCache accelerator:

Document Path :/
Document Length: 21757 bytes
Concurrency Level: 5
Time taken for tests: 99.76300 seconds
Complete requests: 3000
Failed requests: 0
Write errors: 0
Total transferred: 66777000 bytes
HTML transferred: 65271000 bytes
Requests per secondd: 30.28 [#/sec] (mean)
Time per request: 165.127 [MS] (mean)
Time per request: 33.025 [MS] (mean, internal SS all concurrent requests)
Transfer rate: 658.19 [Kbytes/sec] canceled ed
Connection Times (MS)
Min mean [+/-sd] median max
Connect: 0 0 0.0 0 2
Processing: 59 164 83.4 155 3367
Waiting: 52 156 66.4 148
Total: 59 164 83.4 155 3367
Percentage of the requests served within a certain time (MS)
50% 155
66% 178
75% 196
80% 206
90% 237
95% 263
98% 287
99% 305
100% 3367 (longest request)

3. Result summary

	Request time (SEC)	Time per request (MS)	Maximum memory usage (MB)	Minimum memory usage (MB)
None	10.41	96.08	24	24
APC	30.45	32.84	21	21
EAccelerator	31.26	31.99	23	18
XCache	30.28	33.02	29	19

IV. Summary of comparison results of PHP accelerators

???? 1. test results show that the eAccelerator is the best in terms of the combination of request time and memory usage.

???? 2. the test result shows that the request time of the accelerator is about three times faster than that of the non-accelerator.

???? 3. according to official observations, XCache is the fastest updated, which also shows the most promising development.

??????? The above is the summary. you may ask me if I am using that accelerator? I can only tell you that, first of all, it is better to use it than to use it. second, each accelerator has some parameters that can be tuned, so it depends on your system environment, I personally think you can study the eAccelerator and XCache in detail. These two models have great potential. Finally, I made a result chart from a professional testing website:

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