whoami

Mark Sonnabaum

• Performance engineer @ Acquia
• d.o. msonnabaum
• twitter @msonnabaum

Profiling

• It's awesome
• You should do it

What is XHProf?

• A php profiler (php extension)
• A PHP user interface (optional)
• Originally developed at Facebook

https://github.com/facebook/xhprof http://pecl.php.net/package/xhprof

xdebug/webgrind?

• No memory profiling as of Xdebug 2.0.4
• Adds overhead

Installing: pecl

pear upgrade PEAR
pecl install xhprof-0.9.2

Installing: OSX - MAMP

php 5.3 (simple)

https://gist.github.com/1306569

php 5.2 (painful)

http://www.lullabot.com/articles/installing-xhprof-mamp-on-mac-os-106-snow-leopard

Installing: OSX - brew

https://github.com/msonnabaum/megalodon/blob/master/formulas/xhprof.rb

brew install xhprof

Installing: source

wget http://pecl.php.net/get/xhprof-0.9.2.tgz
tar -xzf xhprof-0.9.2.tgz && cd xhprof-0.9.2
phpize
make
cp modules/xhprof.so $(php-config --extension-dir)/

Preperations

• Setup the site locally
• disable xdebug (skews results)

   ;zend_extension=/usr/lib/php/extensions/no-debug-non-zts-20090626/xdebug.so

• D6: devel, D7: xhprof module
• memcache/redis (optional but recommended)

Preperations

D6

$conf['devel_xhprof_enabled'] = 1;
$conf['devel_xhprof_directory'] = '/Users/msonnabaum/www/xhprof';
$conf['devel_xhprof_url'] = 'http://localhost/xhprof/xhprof_html';

D7

$conf['xhprof_enabled'] = 1;

Special functions

main()

• Doesn't actually exist, just represents the entire request.

Special functions

load::node/node.module

load() = load/compile time

• Time spent here usually means loading from a slow disk, a cold APC hit, or apc.shm_size is too small.

Special functions

run_init::node/node.module

run_init() = code execution

Special functions

drupal_render
 ↳ drupal_render@1
    ↳ drupal_render@2
       ↳ drupal_render@3
          ↳ drupal_render@4
             ↳ drupal_render@5

@ shows recursion depth.

Red flags

exec(), shell_exec()

• Only use when it can't be done in PHP
• Avoid unnecessary I/O

Red flags

drupal_http_request()

• Move client side or queue it when possible

Red flags

file_scan_directory()

• Disks are crazy slow, don't do this

Resources

• XHProf module for D7
• XHProflib
• xhprof.me

http://xhprof-pres.dev/events - unpack_options

native drupal xhprof ui .notes - http://d7.dev/admin/reports/xhprof .notes - http://d7.dev/admin/reports/xhprof/diff/4e99c0c276515/4e99c0bf949a8

XHProflib - https://github.com/msonnabaum/XHProfLib