includes/profiler/ProfilerXhprof.php

   1 <?php
   2 /**
   3  * @section LICENSE
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  * http://www.gnu.org/copyleft/gpl.html
  18  *
  19  * @file
  20  */
  21
  22 /**
  23  * Profiler wrapper for XHProf extension.
  24  *
  25  * Mimics the output of ProfilerStandard using data collected via the XHProf
  26  * PHP extension.
  27  *
  28  * @code
  29  * $wgProfiler['class'] = 'ProfilerXhprof';
  30  * $wgProfiler['flags'] = XHPROF_FLAGS_NO_BUILTINS;
  31  * $wgProfiler['output'] = 'text';
  32  * $wgProfiler['visible'] = true;
  33  * @endcode
  34  *
  35  * @code
  36  * $wgProfiler['class'] = 'ProfilerXhprof';
  37  * $wgProfiler['flags'] = XHPROF_FLAGS_CPU | XHPROF_FLAGS_MEMORY | XHPROF_FLAGS_NO_BUILTINS;
  38  * $wgProfiler['output'] = 'udp';
  39  * @endcode
  40  *
  41  * Rather than obeying wfProfileIn() and wfProfileOut() calls placed in the
  42  * application code, ProfilerXhprof profiles all functions using the XHProf
  43  * PHP extenstion. For PHP5 users, this extension can be installed via PECL or
  44  * your operating system's package manager. XHProf support is built into HHVM.
  45  *
  46  * To restrict the functions for which profiling data is collected, you can
  47  * use either a whitelist ($wgProfiler['include']) or a blacklist
  48  * ($wgProfiler['exclude']) containing an array of function names. The
  49  * blacklist functionality is built into HHVM and will completely exclude the
  50  * named functions from profiling collection. The whitelist is implemented by
  51  * Xhprof class which will filter the data collected by XHProf before reporting.
  52  * See documentation for the Xhprof class and the XHProf extension for
  53  * additional information.
  54  *
  55  * @author Bryan Davis <bd808@wikimedia.org>
  56  * @copyright © 2014 Bryan Davis and Wikimedia Foundation.
  57  * @ingroup Profiler
  58  * @see Xhprof
  59  * @see https://php.net/xhprof
  60  * @see https://github.com/facebook/hhvm/blob/master/hphp/doc/profiling.md
  61  */
  62 class ProfilerXhprof extends Profiler {
  63
  64         /**
  65          * @var Xhprof $xhprof
  66          */
  67         protected $xhprof;
  68
  69         /**
  70          * Type of report to send when logData() is called.
  71          * @var string $logType
  72          */
  73         protected $logType;
  74
  75         /**
  76          * Should profile report sent to in page content be visible?
  77          * @var bool $visible
  78          */
  79         protected $visible;
  80
  81         /**
  82          * @param array $params
  83          * @see Xhprof::__construct()
  84          */
  85         public function __construct( array $params = array() ) {
  86                 $params = array_merge(
  87                         array(
  88                                 'log' => 'text',
  89                                 'visible' => false
  90                         ),
  91                         $params
  92                 );
  93                 parent::__construct( $params );
  94                 $this->logType = $params['log'];
  95                 $this->visible = $params['visible'];
  96                 $this->xhprof = new Xhprof( $params );
  97         }
  98
  99         public function isStub() {
 100                 return false;
 101         }
 102
 103         /**
 104          * No-op for xhprof profiling.
 105          *
 106          * Use the 'include' configuration key instead if you need to constrain
 107          * the functions that are profiled.
 108          *
 109          * @param string $functionname
 110          */
 111         public function profileIn( $functionname ) {
 112         }
 113
 114         /**
 115          * No-op for xhprof profiling.
 116          *
 117          * Use the 'include' configuration key instead if you need to constrain
 118          * the functions that are profiled.
 119          *
 120          * @param string $functionname
 121          */
 122         public function profileOut( $functionname ) {
 123         }
 124
 125         public function scopedProfileIn( $section ) {
 126                 static $exists = null;
 127                 // Only HHVM supports this, not the standard PECL extension
 128                 if ( $exists === null ) {
 129                         $exists = function_exists( 'xhprof_frame_begin' );
 130                 }
 131
 132                 if ( $exists ) {
 133                         xhprof_frame_begin( $section );
 134                         return new ScopedCallback( function() use ( $section ) {
 135                                 xhprof_frame_end( $section );
 136                         } );
 137                 }
 138
 139                 return null;
 140         }
 141
 142         /**
 143          * No-op for xhprof profiling.
 144          */
 145         public function close() {
 146         }
 147
 148         public function getFunctionStats() {
 149                 $metrics = $this->xhprof->getCompleteMetrics();
 150                 $profile = array();
 151
 152                 foreach ( $metrics as $fname => $stats ) {
 153                         // Convert elapsed times from μs to ms to match ProfilerStandard
 154                         $profile[] = array(
 155                                 'name' => $fname,
 156                                 'calls' => $stats['ct'],
 157                                 'real' => $stats['wt']['total'] / 1000,
 158                                 '%real' => $stats['wt']['percent'],
 159                                 'cpu' => isset( $stats['cpu'] ) ? $stats['cpu']['total'] / 1000 : 0,
 160                                 '%cpu' => isset( $stats['cpu'] ) ? $stats['cpu']['percent'] : 0,
 161                                 'memory' => isset( $stats['mu'] ) ? $stats['mu']['total'] : 0,
 162                                 '%memory' => isset( $stats['mu'] ) ? $stats['mu']['percent'] : 0,
 163                                 'min' => $stats['wt']['min'] / 1000,
 164                                 'max' => $stats['wt']['max'] / 1000
 165                         );
 166                 }
 167
 168                 return $profile;
 169         }
 170
 171         /**
 172          * Returns a profiling output to be stored in debug file
 173          *
 174          * @return string
 175          */
 176         public function getOutput() {
 177                 return $this->getFunctionReport();
 178         }
 179
 180         /**
 181          * Get a report of profiled functions sorted by inclusive wall clock time
 182          * in descending order.
 183          *
 184          * Each line of the report includes this data:
 185          * - Function name
 186          * - Number of times function was called
 187          * - Total wall clock time spent in function in microseconds
 188          * - Minimum wall clock time spent in function in microseconds
 189          * - Average wall clock time spent in function in microseconds
 190          * - Maximum wall clock time spent in function in microseconds
 191          * - Percentage of total wall clock time spent in function
 192          * - Total delta of memory usage from start to end of function in bytes
 193          *
 194          * @return string
 195          */
 196         protected function getFunctionReport() {
 197                 $data = $this->xhprof->getInclusiveMetrics();
 198                 uasort( $data, Xhprof::makeSortFunction( 'wt', 'total' ) );
 199
 200                 $width = 140;
 201                 $nameWidth = $width - 65;
 202                 $format = "%-{$nameWidth}s %6d %9d %9d %9d %9d %7.3f%% %9d";
 203                 $out = array();
 204                 $out[] = sprintf( "%-{$nameWidth}s %6s %9s %9s %9s %9s %7s %9s",
 205                         'Name', 'Calls', 'Total', 'Min', 'Each', 'Max', '%', 'Mem'
 206                 );
 207                 foreach ( $data as $func => $stats ) {
 208                         $out[] = sprintf( $format,
 209                                 $func,
 210                                 $stats['ct'],
 211                                 $stats['wt']['total'],
 212                                 $stats['wt']['min'],
 213                                 $stats['wt']['mean'],
 214                                 $stats['wt']['max'],
 215                                 $stats['wt']['percent'],
 216                                 isset( $stats['mu'] ) ? $stats['mu']['total'] : 0
 217                         );
 218                 }
 219                 return implode( "\n", $out );
 220         }
 221
 222         /**
 223          * Get a brief report of profiled functions sorted by inclusive wall clock
 224          * time in descending order.
 225          *
 226          * Each line of the report includes this data:
 227          * - Percentage of total wall clock time spent in function
 228          * - Total wall clock time spent in function in seconds
 229          * - Number of times function was called
 230          * - Function name
 231          *
 232          * @param string $header Header text to prepend to report
 233          * @param string $footer Footer text to append to report
 234          * @return string
 235          */
 236         protected function getSummaryReport( $header = '', $footer = '' ) {
 237                 $data = $this->xhprof->getInclusiveMetrics();
 238                 uasort( $data, Xhprof::makeSortFunction( 'wt', 'total' ) );
 239
 240                 $format = '%6.2f%% %3.6f %6d - %s';
 241                 $out = array( $header );
 242                 foreach ( $data as $func => $stats ) {
 243                         $out[] = sprintf( $format,
 244                                 $stats['wt']['percent'],
 245                                 $stats['wt']['total'] / 1e6,
 246                                 $stats['ct'],
 247                                 $func
 248                         );
 249                 }
 250                 $out[] = $footer;
 251                 return implode( "\n", $out );
 252         }
 253 }