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Profiler settings XHprof for universal use

03.12.2011
Налаштування профайлера XHprof для універсального використання
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In my previous article capabilities of PHP code profiler XHprof from Facebook developers, namely installation, setting and usage were discussed.

The task today is to set a profiler for universal usage looking like:

/mysite/page>?debug

So that one could use a profiler with the help of the same method for each page.We have achieved that. So this article covers this issue.

So,

0) we determine development-site on which we want to profile and analyze web-application

1) we create domain <xhprof_domain>. We copy folders xhprof_html and xhprof_lib from original folder XHprof into domain directory.

2) we create xhprof_log folder in the root of domain.

3) we create xhprof.php file in the root of domain with the following content:

 function my_xhprof_enable() {
  if (extension_loaded('xhprof')) {
    switch ($_GET['debug']) {
      case 'simple':
        define('DEBUG_MICROTIME_START', microtime(1));
        break;
      
      case 'all':
        xhprof_enable(XHPROF_FLAGS_CPU + XHPROF_FLAGS_MEMORY);
        break;
      
      case 'cpu':
        xhprof_enable(XHPROF_FLAGS_CPU);
        break;
      
      case 'memory':
        xhprof_enable(XHPROF_FLAGS_MEMORY);
        break;
      
      case 'time':
      default:
        xhprof_enable();
    }
  }
}

function my_xhprof_disable() {
  if ($_GET['debug'] == 'simple') {
    $time = number_format(microtime(1) - DEBUG_MICROTIME_START, 4);
    $cur  = number_format(memory_get_usage() / 1024, 3);
    $peak = number_format(memory_get_peak_usage() / 1024, 3);
    print "\ntime = {$time} seconds<br />\nmemory_get_usage = {$cur} kb<br />\nmemory_get_peak_usage = {$peak} kb";
  }
  elseif (extension_loaded('xhprof')) {
    include_once dirname(__FILE__) . '/xhprof_lib/utils/xhprof_lib.php';
    include_once dirname(__FILE__) . '/xhprof_lib/utils/xhprof_runs.php';
    $profiler_namespace = isset($_GET['namespace']) ? $_GET['namespace'] : $_SERVER['SERVER_NAME'];
    $xhprof_data = xhprof_disable();
    $xhprof_runs = new XHProfRuns_Default();
    $run_id = $xhprof_runs->save_run($xhprof_data, $profiler_namespace);
   
    $profiler_url = sprintf('<xhprof_domain>/xhprof_html/index.php?run=%s&source=%s', $run_id, $profiler_namespace);
    print '<script type="text/javascript">window.location.href=\''. $profiler_url .'\';</script>';
  }
}

if (isset($_GET['debug'])) {
  my_xhprof_enable();
  register_shutdown_function('my_xhprof_disable');
}

4) we edit the lines a little bit in php.ini, not forgetting to restart web-server after that:

extension=xhprof.so
xhprof.output_dir=/path/to/your/<xhprof-domain>/on/server/xhprof_log
auto_prepend_file=/path/to/your/<xhprof-domain>/on/server/xhprof.php

5) Enjoy it!

On any page of any domain we add GET-parameter «?debug» into address line (or ?debug=time, or ?debug=memory, or ?debug=cpu, or ?debug=all) and watch the result :)

 

 We must take into consideration the fact that during exhaustive usage of  XHprof the time of page generation increases by about 2.5-4.5 ms, that’s why data don’t correspond to the reality. For example, on pages where generation time is very short; we have to understand that there is a range of inaccuracy between 2.5-4.5 to be taken into account. Sometimes it’s important.

In this case we use simplified mode “?debug=simple”. Now XHprof doesn’t connect at all and we see the system output of real data about resources in simplified version at the bottom of page.

 time = 0.0020 seconds
 memory_get_usage = 143.156 kb

 memory_get_peak_usage = 183.211 kb

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