PHP Accelerator: Difference between revisions

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If you run your own LAMP server with PHP applications, then please install it. The [[Moodle]] documentation includes information on [http://docs.moodle.org/en/Installing_APC_in_Windows setting up APC]; including testing before and after performance with "[http://httpd.apache.org/docs/2.0/programs/ab.html Apache Bench]"

The Cerberus wiki also describes Memcache in addition to APC. Their graphics illustrate the chain of execution for request processing http://wiki.cerb4.com/wiki/Performance

== Installation ==

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# Restart Apache

# Use the Apache Bench tool to test performance with and without APC enabled.

== Results ==

Here are the results of a simple benchmark. Without APC, the request response times averaged around 600 milliseconds while with APC, they were around 150 milliseconds so APC reduced response times by 75%

[[Image:Http-benchmark-without-apc.png|450px|thumb|right|Without APC]]

[[Image:Http-benchmark-with-apc.png|450px|thumb|right|With APC]]

== Notes ==

APC, aside from speeding up your website, also provides a storage mechanism outside the traditional cookie/session mechanism. So, you could set an application variable or constant and (assuming that the cache is not cleared, etc.) retrieve that value from another context.

The graphs were produced using '''ab''' and '''gnuplot''' ab is Apache Bench, a benchmarking and stress-testing tool. Using -g to produce CSV output suitable for feeding to spreadsheets or gnuplot, you can generate the graphs.

ab -g ~/ab-without-apc.csv -n 50 -c 1 http://freephile.com/wiki/index.php/Main_Page

</source>

produces this output:

<pre>

This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0

Benchmarking freephile.com (be patient).....done

Server Software: Apache

Server Hostname: freephile.com

Server Port: 80

Document Path: /wiki/index.php/Main_Page

Document Length: 15778 bytes

Concurrency Level: 1

Time taken for tests: 30.313117 seconds

Complete requests: 50

Failed requests: 0

Write errors: 0

Total transferred: 815850 bytes

HTML transferred: 788900 bytes

Requests per second: 1.65 [#/sec] (mean)

Time per request: 606.262 [ms] (mean)

Time per request: 606.262 [ms] (mean, across all concurrent requests)

Transfer rate: 26.26 [Kbytes/sec] received

Connection Times (ms)

min mean[+/-sd] median max

Connect: 1 1 0.1 1 2

Processing: 515 604 113.4 567 1030

Waiting: 464 546 109.6 513 967

Total: 516 605 113.4 568 1031

Percentage of the requests served within a certain time (ms)

50% 568

66% 600

75% 608

80% 644

90% 734

95% 925

98% 1031

99% 1031

100% 1031 (longest request)

</pre>

Then, by invoking gnuplot, you can create the graphs:

<pre>

gnuplot> set terminal png

Terminal type set to 'png'

Options are 'nocrop medium '

gnuplot> set output "http-benchmark-with-apc.png"

gnuplot> set xlabel "request"

gnuplot> set ylabel "ms"

gnuplot> plot "/home/greg/ab-with-apc.csv" using 7 with lines title "ctime", \

> "/home/greg/ab-with-apc.csv" using 8 with lines title "dtime", \

> "/home/greg/ab-with-apc.csv" using 9 with lines title "ttime", \

> "/home/greg/ab-with-apc.csv" using 10 with lines title "wait"

gnuplot> set output "http-benchmark-without-apc.png"

gnuplot> plot "/home/greg/ab-without-apc.csv" using 7 with lines title "ctime", \

> "/home/greg/ab-without-apc.csv" using 8 with lines title "dtime", \

> "/home/greg/ab-without-apc.csv" using 9 with lines title "ttime", \

> "/home/greg/ab-without-apc.csv" using 10 with lines title "wait"

</pre>

[[Category:Apache]]

[[Category:PHP]]

[[Category:Wiki]]

[[Category:Sysadmin]]

@@ Line 2: / Line 2: @@
 If you run your own LAMP server with PHP applications, then please install it.   The [[Moodle]] documentation includes information on [http://docs.moodle.org/en/Installing_APC_in_Windows setting up APC]; including testing before and after performance with "[http://httpd.apache.org/docs/2.0/programs/ab.html Apache Bench]"
+The Cerberus wiki also describes Memcache in addition to APC.  Their graphics illustrate the chain of execution for request processing http://wiki.cerb4.com/wiki/Performance
 == Installation ==
@@ Line 38: / Line 40: @@
 # Restart Apache
 # Use the Apache Bench tool to test performance with and without APC enabled.
+== Results ==
+Here are the results of a simple benchmark.  Without APC, the request response times averaged around 600 milliseconds while with APC, they were around 150 milliseconds so APC reduced response times by 75%
+[[Image:Http-benchmark-without-apc.png|450px|thumb|right|Without APC]]
+[[Image:Http-benchmark-with-apc.png|450px|thumb|right|With APC]]
 == Notes ==
 APC, aside from speeding up your website, also provides a storage mechanism outside the traditional cookie/session mechanism.  So, you could set an application variable or constant and (assuming that the cache is not cleared, etc.) retrieve that value from another context.
+The graphs were produced using '''ab''' and '''gnuplot'''  ab is Apache Bench, a benchmarking and stress-testing tool.  Using -g to produce CSV output suitable for feeding to spreadsheets or gnuplot, you can generate the graphs.
+<source lang="bash">
+ab -g ~/ab-without-apc.csv -n 50 -c 1 http://freephile.com/wiki/index.php/Main_Page
+</source>
+produces this output:
+<pre>
+This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
+Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
+Copyright 2006 The Apache Software Foundation, http://www.apache.org/
+Benchmarking freephile.com (be patient).....done
+Server Software:        Apache
+Server Hostname:        freephile.com
+Server Port:            80
+Document Path:          /wiki/index.php/Main_Page
+Document Length:        15778 bytes
+Concurrency Level:      1
+Time taken for tests:   30.313117 seconds
+Complete requests:      50
+Failed requests:        0
+Write errors:           0
+Total transferred:      815850 bytes
+HTML transferred:       788900 bytes
+Requests per second:    1.65 [#/sec] (mean)
+Time per request:       606.262 [ms] (mean)
+Time per request:       606.262 [ms] (mean, across all concurrent requests)
+Transfer rate:          26.26 [Kbytes/sec] received
+Connection Times (ms)
+              min  mean[+/-sd] median   max
+Connect:        1    1   0.1      1       2
+Processing:   515  604 113.4    567    1030
+Waiting:      464  546 109.6    513     967
+Total:        516  605 113.4    568    1031
+Percentage of the requests served within a certain time (ms)
+%    568
+%    600
+%    608
+%    644
+%    734
+%    925
+%   1031
+%   1031
+%   1031 (longest request)
+</pre>
+Then, by invoking gnuplot, you can create the graphs:
+<pre>
+gnuplot> set terminal png
+Terminal type set to 'png'
+Options are 'nocrop medium '
+gnuplot> set output "http-benchmark-with-apc.png"
+gnuplot> set xlabel "request"
+gnuplot> set ylabel "ms"
+gnuplot> plot "/home/greg/ab-with-apc.csv" using 7 with lines title "ctime", \
+> "/home/greg/ab-with-apc.csv" using 8 with lines title "dtime", \
+> "/home/greg/ab-with-apc.csv" using 9 with lines title "ttime", \
+> "/home/greg/ab-with-apc.csv" using 10 with lines title "wait"
+gnuplot> set output "http-benchmark-without-apc.png"
+gnuplot> plot "/home/greg/ab-without-apc.csv" using 7 with lines title "ctime", \
+> "/home/greg/ab-without-apc.csv" using 8 with lines title "dtime", \
+> "/home/greg/ab-without-apc.csv" using 9 with lines title "ttime", \
+> "/home/greg/ab-without-apc.csv" using 10 with lines title "wait"
+</pre>
 [[Category:Apache]]
 [[Category:PHP]]
+[[Category:Wiki]]
+[[Category:Sysadmin]]