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  * It is also possible to use the Tideways PHP extension, which is mostly
  47  * a drop-in replacement for Xhprof. Just change the XHPROF_FLAGS_* constants
  48  * to TIDEWAYS_FLAGS_*.
  49  *
  50  * @copyright © 2014 Wikimedia Foundation and contributors
  51  * @ingroup Profiler
  52  * @see Xhprof
  53  * @see https://php.net/xhprof
  54  * @see https://github.com/facebook/hhvm/blob/master/hphp/doc/profiling.md
  55  * @see https://github.com/tideways/php-profiler-extension
  56  */
  57 class ProfilerXhprof extends Profiler {
  58         /**
  59          * @var XhprofData|null $xhprofData
  60          */
  61         protected $xhprofData;
  62
  63         /**
  64          * Profiler for explicit, arbitrary, frame labels
  65          * @var SectionProfiler
  66          */
  67         protected $sprofiler;
  68
  69         /**
  70          * @param array $params
  71          * @see Xhprof::__construct()
  72          */
  73         public function __construct( array $params = [] ) {
  74                 parent::__construct( $params );
  75
  76                 $flags = isset( $params['flags'] ) ? $params['flags'] : 0;
  77                 $options = isset( $params['exclude'] )
  78                         ? [ 'ignored_functions' => $params['exclude'] ] : [];
  79                 Xhprof::enable( $flags, $options );
  80                 $this->sprofiler = new SectionProfiler();
  81         }
  82
  83         /**
  84          * @return XhprofData
  85          */
  86         public function getXhprofData() {
  87                 if ( !$this->xhprofData ) {
  88                         $this->xhprofData = new XhprofData( Xhprof::disable(), $this->params );
  89                 }
  90                 return $this->xhprofData;
  91         }
  92
  93         public function scopedProfileIn( $section ) {
  94                 $key = 'section.' . ltrim( $section, '.' );
  95                 return $this->sprofiler->scopedProfileIn( $key );
  96         }
  97
  98         /**
  99          * No-op for xhprof profiling.
 100          */
 101         public function close() {
 102         }
 103
 104         /**
 105          * Check if a function or section should be excluded from the output.
 106          *
 107          * @param string $name Function or section name.
 108          * @return bool
 109          */
 110         private function shouldExclude( $name ) {
 111                 if ( $name === '-total' ) {
 112                         return true;
 113                 }
 114                 if ( !empty( $this->params['include'] ) ) {
 115                         foreach ( $this->params['include'] as $pattern ) {
 116                                 if ( fnmatch( $pattern, $name, FNM_NOESCAPE ) ) {
 117                                         return false;
 118                                 }
 119                         }
 120                         return true;
 121                 }
 122                 if ( !empty( $this->params['exclude'] ) ) {
 123                         foreach ( $this->params['exclude'] as $pattern ) {
 124                                 if ( fnmatch( $pattern, $name, FNM_NOESCAPE ) ) {
 125                                         return true;
 126                                 }
 127                         }
 128                 }
 129                 return false;
 130         }
 131
 132         public function getFunctionStats() {
 133                 $metrics = $this->getXhprofData()->getCompleteMetrics();
 134                 $profile = [];
 135
 136                 $main = null; // units in ms
 137                 foreach ( $metrics as $fname => $stats ) {
 138                         if ( $this->shouldExclude( $fname ) ) {
 139                                 continue;
 140                         }
 141                         // Convert elapsed times from μs to ms to match interface
 142                         $entry = [
 143                                 'name' => $fname,
 144                                 'calls' => $stats['ct'],
 145                                 'real' => $stats['wt']['total'] / 1000,
 146                                 '%real' => $stats['wt']['percent'],
 147                                 'cpu' => isset( $stats['cpu'] ) ? $stats['cpu']['total'] / 1000 : 0,
 148                                 '%cpu' => isset( $stats['cpu'] ) ? $stats['cpu']['percent'] : 0,
 149                                 'memory' => isset( $stats['mu'] ) ? $stats['mu']['total'] : 0,
 150                                 '%memory' => isset( $stats['mu'] ) ? $stats['mu']['percent'] : 0,
 151                                 'min_real' => $stats['wt']['min'] / 1000,
 152                                 'max_real' => $stats['wt']['max'] / 1000
 153                         ];
 154                         $profile[] = $entry;
 155                         if ( $fname === 'main()' ) {
 156                                 $main = $entry;
 157                         }
 158                 }
 159
 160                 // Merge in all of the custom profile sections
 161                 foreach ( $this->sprofiler->getFunctionStats() as $stats ) {
 162                         if ( $this->shouldExclude( $stats['name'] ) ) {
 163                                 continue;
 164                         }
 165
 166                         // @note: getFunctionStats() values already in ms
 167                         $stats['%real'] = $main['real'] ? $stats['real'] / $main['real'] * 100 : 0;
 168                         $stats['%cpu'] = $main['cpu'] ? $stats['cpu'] / $main['cpu'] * 100 : 0;
 169                         $stats['%memory'] = $main['memory'] ? $stats['memory'] / $main['memory'] * 100 : 0;
 170                         $profile[] = $stats; // assume no section names collide with $metrics
 171                 }
 172
 173                 return $profile;
 174         }
 175
 176         /**
 177          * Returns a profiling output to be stored in debug file
 178          *
 179          * @return string
 180          */
 181         public function getOutput() {
 182                 return $this->getFunctionReport();
 183         }
 184
 185         /**
 186          * Get a report of profiled functions sorted by inclusive wall clock time
 187          * in descending order.
 188          *
 189          * Each line of the report includes this data:
 190          * - Function name
 191          * - Number of times function was called
 192          * - Total wall clock time spent in function in microseconds
 193          * - Minimum wall clock time spent in function in microseconds
 194          * - Average wall clock time spent in function in microseconds
 195          * - Maximum wall clock time spent in function in microseconds
 196          * - Percentage of total wall clock time spent in function
 197          * - Total delta of memory usage from start to end of function in bytes
 198          *
 199          * @return string
 200          */
 201         protected function getFunctionReport() {
 202                 $data = $this->getFunctionStats();
 203                 usort( $data, function ( $a, $b ) {
 204                         if ( $a['real'] === $b['real'] ) {
 205                                 return 0;
 206                         }
 207                         return ( $a['real'] > $b['real'] ) ? -1 : 1; // descending
 208                 } );
 209
 210                 $width = 140;
 211                 $nameWidth = $width - 65;
 212                 $format = "%-{$nameWidth}s %6d %9d %9d %9d %9d %7.3f%% %9d";
 213                 $out = [];
 214                 $out[] = sprintf( "%-{$nameWidth}s %6s %9s %9s %9s %9s %7s %9s",
 215                         'Name', 'Calls', 'Total', 'Min', 'Each', 'Max', '%', 'Mem'
 216                 );
 217                 foreach ( $data as $stats ) {
 218                         $out[] = sprintf( $format,
 219                                 $stats['name'],
 220                                 $stats['calls'],
 221                                 $stats['real'] * 1000,
 222                                 $stats['min_real'] * 1000,
 223                                 $stats['real'] / $stats['calls'] * 1000,
 224                                 $stats['max_real'] * 1000,
 225                                 $stats['%real'],
 226                                 $stats['memory']
 227                         );
 228                 }
 229                 return implode( "\n", $out );
 230         }
 231
 232         /**
 233          * Retrieve raw data from xhprof
 234          * @return array
 235          */
 236         public function getRawData() {
 237                 return $this->getXhprofData()->getRawData();
 238         }
 239 }