Hey all,
After reading this post (
http://www.reddit.com/r/PHP/comments/13uwgk/phar_performance/ ), and
having my own curiosity of the current state of things, I wanted to dig
in an see what the performance of APC with phar files was.
I've found some oddities in performance, and I am hoping before I do any
deeper investigation, someone might know something.
The app is here:
https://github.com/ralphschindler/test-phar-performance-apc/
The library I am attempting to introduce to the app is Zend_Db.phar. I
chose this b/c I fully know the code base, and the phar clocks in at
519844 bytes uncompressed.
It breaks down like this:
/index.php - baseline app without addition of library
/index-with-filesys.php - Zend_Db library extracted to filesystem
/index-with-phar.php - Zend_Db as phar included
Without APC, on my machine, I get a slight drop off, but acceptable.
With APC, the drop off in performance is very noticable. Even with
stat=0, only in a very specific usage scenario (described below) does it
actually nullify phar vs. filesystem.
Without APC (enabled=0)
-----------------------
$ ab -H "Connection: close" -n 500 http://test.dev/index-with-filesys.php
Requests per second: 111.19 [#/sec] (mean)
Time per request: 8.994 [ms] (mean)
$ ab -H "Connection: close" -n 500 http://test.dev/index-with-phar.php
Requests per second: 87.49 [#/sec] (mean)
Time per request: 11.429 [ms] (mean)
Then APC 3.1.13 (Beta) is introduced, the app is clearly faster on the
filesystem, but not nearly as fast one would expect in the phar version:
With APC (enabled=1, stat=1)
----------------------------
$ ab -H "Connection: close" -n 500 http://test.dev/index-with-filesys.php
Requests per second: 474.47 [#/sec] (mean)
Time per request: 2.108 [ms] (mean)
$ ab -H "Connection: close" -n 500 http://test.dev/index-with-phar.php
Requests per second: 238.84 [#/sec] (mean)
Time per request: 4.187 [ms] (mean)
With APC (enabled=1, stat=0)
----------------------------
$ ab -H "Connection: close" -n 500 http://test.dev/index-with-filesys.php
Requests per second: 529.02 [#/sec] (mean)
Time per request: 1.890 [ms] (mean)
$ ab -H "Connection: close" -n 500 http://test.dev/index-with-phar.php
Requests per second: 246.71 [#/sec] (mean)
Time per request: 4.053 [ms] (mean)
With APC (enabled=1, stat=0) (With include_path hack)
-----------------------------------------------------
If this line:
require '../vendor/Zend_Db-2.1.0beta1.phar';
is swapped out with this (to ensure the require is relative to include):
set_include_path('.:' . realpath(__DIR__ . '/../vendor'));
require 'Zend_Db-2.1.0beta1.phar';
I get the following:
$ ab -H "Connection: close" -n 500 http://test.dev/index-with-phar.php
Requests per second: 522.68 [#/sec] (mean)
Time per request: 1.913 [ms] (mean)
Can someone help me make sense of all this? Here are my questions:
* The phar files are listed in the apc_cache_info() with >1 hits, are
the stat's to those phar files really much slower than to filesystem files?
* Why does the include_path trick affect performance with regards to
phar files?
-ralph
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