includes/profiler/ProfilerXhprof.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  */
  20
  21 /**
  22  * Profiler wrapper for XHProf extension.
  23  *
  24  * @code
  25  * $wgProfiler['class'] = 'ProfilerXhprof';
  26  * $wgProfiler['flags'] = XHPROF_FLAGS_NO_BUILTINS;
  27  * $wgProfiler['output'] = 'text';
  28  * $wgProfiler['visible'] = true;
  29  * @endcode
  30  *
  31  * @code
  32  * $wgProfiler['class'] = 'ProfilerXhprof';
  33  * $wgProfiler['flags'] = XHPROF_FLAGS_CPU | XHPROF_FLAGS_MEMORY | XHPROF_FLAGS_NO_BUILTINS;
  34  * $wgProfiler['output'] = 'udp';
  35  * @endcode
  36  *
  37  * ProfilerXhprof profiles all functions using the XHProf PHP extenstion.
  38  * For PHP5 users, this extension can be installed via PECL or your operating
  39  * system's package manager. XHProf support is built into HHVM.
  40  *
  41  * To restrict the functions for which profiling data is collected, you can
  42  * use either a whitelist ($wgProfiler['include']) or a blacklist
  43  * ($wgProfiler['exclude']) containing an array of function names.
  44  * Shell-style patterns are also accepted.
  45  *
  46  * @author Bryan Davis <bd808@wikimedia.org>
  47  * @copyright © 2014 Bryan Davis and Wikimedia Foundation.
  48  * @ingroup Profiler
  49  * @see Xhprof
  50  * @see https://php.net/xhprof
  51  * @see https://github.com/facebook/hhvm/blob/master/hphp/doc/profiling.md
  52  */
  53 class ProfilerXhprof extends Profiler {
  54         /**
  55          * @var Xhprof $xhprof
  56          */
  57         protected $xhprof;
  58
  59         /**
  60          * Profiler for explicit, arbitrary, frame labels
  61          * @var SectionProfiler
  62          */
  63         protected $sprofiler;
  64
  65         /**
  66          * @param array $params
  67          * @see Xhprof::__construct()
  68          */
  69         public function __construct( array $params = array() ) {
  70                 parent::__construct( $params );
  71                 $this->xhprof = new Xhprof( $params );
  72                 $this->sprofiler = new SectionProfiler();
  73         }
  74
  75         public function scopedProfileIn( $section ) {
  76                 $key = 'section.' . ltrim( $section, '.' );
  77                 return $this->sprofiler->scopedProfileIn( $key );
  78         }
  79
  80         /**
  81          * No-op for xhprof profiling.
  82          */
  83         public function close() {
  84         }
  85
  86         /**
  87          * Check if a function or section should be excluded from the output.
  88          *
  89          * @param string $name Function or section name.
  90          * @return bool
  91          */
  92         private function shouldExclude( $name ) {
  93                 if ( $name === '-total' ) {
  94                         return true;
  95                 }
  96                 if ( !empty( $this->params['include'] ) ) {
  97                         foreach ( $this->params['include'] as $pattern ) {
  98                                 if ( fnmatch( $pattern, $name, FNM_NOESCAPE ) ) {
  99                                         return false;
 100                                 }
 101                         }
 102                         return true;
 103                 }
 104                 if ( !empty( $this->params['exclude'] ) ) {
 105                         foreach ( $this->params['exclude'] as $pattern ) {
 106                                 if ( fnmatch( $pattern, $name, FNM_NOESCAPE ) ) {
 107                                         return true;
 108                                 }
 109                         }
 110                 }
 111                 return false;
 112         }
 113
 114         public function getFunctionStats() {
 115                 $metrics = $this->xhprof->getCompleteMetrics();
 116                 $profile = array();
 117
 118                 $main = null; // units in ms
 119                 foreach ( $metrics as $fname => $stats ) {
 120                         if ( $this->shouldExclude( $fname ) ) {
 121                                 continue;
 122                         }
 123                         // Convert elapsed times from μs to ms to match interface
 124                         $entry = array(
 125                                 'name' => $fname,
 126                                 'calls' => $stats['ct'],
 127                                 'real' => $stats['wt']['total'] / 1000,
 128                                 '%real' => $stats['wt']['percent'],
 129                                 'cpu' => isset( $stats['cpu'] ) ? $stats['cpu']['total'] / 1000 : 0,
 130                                 '%cpu' => isset( $stats['cpu'] ) ? $stats['cpu']['percent'] : 0,
 131                                 'memory' => isset( $stats['mu'] ) ? $stats['mu']['total'] : 0,
 132                                 '%memory' => isset( $stats['mu'] ) ? $stats['mu']['percent'] : 0,
 133                                 'min_real' => $stats['wt']['min'] / 1000,
 134                                 'max_real' => $stats['wt']['max'] / 1000
 135                         );
 136                         $profile[] = $entry;
 137                         if ( $fname === 'main()' ) {
 138                                 $main = $entry;
 139                         }
 140                 }
 141
 142                 // Merge in all of the custom profile sections
 143                 foreach ( $this->sprofiler->getFunctionStats() as $stats ) {
 144                         if ( $this->shouldExclude( $stats['name'] ) ) {
 145                                 continue;
 146                         }
 147
 148                         // @note: getFunctionStats() values already in ms
 149                         $stats['%real'] = $main['real'] ? $stats['real'] / $main['real'] * 100 : 0;
 150                         $stats['%cpu'] = $main['cpu'] ? $stats['cpu'] / $main['cpu'] * 100 : 0;
 151                         $stats['%memory'] = $main['memory'] ? $stats['memory'] / $main['memory'] * 100 : 0;
 152                         $profile[] = $stats; // assume no section names collide with $metrics
 153                 }
 154
 155                 return $profile;
 156         }
 157
 158         /**
 159          * Returns a profiling output to be stored in debug file
 160          *
 161          * @return string
 162          */
 163         public function getOutput() {
 164                 return $this->getFunctionReport();
 165         }
 166
 167         /**
 168          * Get a report of profiled functions sorted by inclusive wall clock time
 169          * in descending order.
 170          *
 171          * Each line of the report includes this data:
 172          * - Function name
 173          * - Number of times function was called
 174          * - Total wall clock time spent in function in microseconds
 175          * - Minimum wall clock time spent in function in microseconds
 176          * - Average wall clock time spent in function in microseconds
 177          * - Maximum wall clock time spent in function in microseconds
 178          * - Percentage of total wall clock time spent in function
 179          * - Total delta of memory usage from start to end of function in bytes
 180          *
 181          * @return string
 182          */
 183         protected function getFunctionReport() {
 184                 $data = $this->getFunctionStats();
 185                 usort( $data, function( $a, $b ) {
 186                         if ( $a['real'] === $b['real'] ) {
 187                                 return 0;
 188                         }
 189                         return ( $a['real'] > $b['real'] ) ? -1 : 1; // descending
 190                 } );
 191
 192                 $width = 140;
 193                 $nameWidth = $width - 65;
 194                 $format = "%-{$nameWidth}s %6d %9d %9d %9d %9d %7.3f%% %9d";
 195                 $out = array();
 196                 $out[] = sprintf( "%-{$nameWidth}s %6s %9s %9s %9s %9s %7s %9s",
 197                         'Name', 'Calls', 'Total', 'Min', 'Each', 'Max', '%', 'Mem'
 198                 );
 199                 foreach ( $data as $stats ) {
 200                         $out[] = sprintf( $format,
 201                                 $stats['name'],
 202                                 $stats['calls'],
 203                                 $stats['real'] * 1000,
 204                                 $stats['min_real'] * 1000,
 205                                 $stats['real'] / $stats['calls'] * 1000,
 206                                 $stats['max_real'] * 1000,
 207                                 $stats['%real'],
 208                                 $stats['memory']
 209                         );
 210                 }
 211                 return implode( "\n", $out );
 212         }
 213
 214         /**
 215          * Retrieve raw data from xhprof
 216          * @return array
 217          */
 218         public function getRawData() {
 219                 return $this->xhprof->getRawData();
 220         }
 221 }