includes/Profiler.php

   1 <?php
   2 /**
   3  * @defgroup Profiler Profiler
   4  *
   5  * @file
   6  * @ingroup Profiler
   7  * This file is only included if profiling is enabled
   8  */
   9
  10 /** backward compatibility */
  11 $wgProfiling = true;
  12
  13 /**
  14  * Begin profiling of a function
  15  * @param $functioname name of the function we will profile
  16  */
  17 function wfProfileIn( $functionname ) {
  18         global $wgProfiler;
  19         $wgProfiler->profileIn( $functionname );
  20 }
  21
  22 /**
  23  * Stop profiling of a function
  24  * @param $functioname name of the function we have profiled
  25  */
  26 function wfProfileOut( $functionname = 'missing' ) {
  27         global $wgProfiler;
  28         $wgProfiler->profileOut( $functionname );
  29 }
  30
  31 /**
  32  * Returns a profiling output to be stored in debug file
  33  *
  34  * @param float $start
  35  * @param float $elapsed time elapsed since the beginning of the request
  36  */
  37 function wfGetProfilingOutput( $start, $elapsed ) {
  38         global $wgProfiler;
  39         return $wgProfiler->getOutput( $start, $elapsed );
  40 }
  41
  42 /**
  43  * Close opened profiling sections
  44  */
  45 function wfProfileClose() {
  46         global $wgProfiler;
  47         $wgProfiler->close();
  48 }
  49
  50 if (!function_exists('memory_get_usage')) {
  51         # Old PHP or --enable-memory-limit not compiled in
  52         function memory_get_usage() {
  53                 return 0;
  54         }
  55 }
  56
  57 /**
  58  * @ingroup Profiler
  59  * @todo document
  60  */
  61 class Profiler {
  62         var $mStack = array (), $mWorkStack = array (), $mCollated = array ();
  63         var $mCalls = array (), $mTotals = array ();
  64
  65         function __construct() {
  66                 // Push an entry for the pre-profile setup time onto the stack
  67                 global $wgRequestTime;
  68                 if ( !empty( $wgRequestTime ) ) {
  69                         $this->mWorkStack[] = array( '-total', 0, $wgRequestTime, 0 );
  70                         $this->mStack[] = array( '-setup', 1, $wgRequestTime, 0, microtime(true), 0 );
  71                 } else {
  72                         $this->profileIn( '-total' );
  73                 }
  74         }
  75
  76         /**
  77          * Called by wfProfieIn()
  78          * @param $functionname string
  79          */
  80         function profileIn( $functionname ) {
  81                 global $wgDebugFunctionEntry, $wgProfiling;
  82                 if( !$wgProfiling ) return;
  83                 if( $wgDebugFunctionEntry ){
  84                         $this->debug( str_repeat( ' ', count( $this->mWorkStack ) ) . 'Entering ' . $functionname . "\n" );
  85                 }
  86
  87                 $this->mWorkStack[] = array( $functionname, count( $this->mWorkStack ), $this->getTime(), memory_get_usage() );
  88         }
  89
  90         /**
  91          * Called by wfProfieOut()
  92          * @param $functionname string
  93          */
  94         function profileOut($functionname) {
  95                 global $wgDebugFunctionEntry, $wgProfiling;;
  96                 if( !$wgProfiling ) return;
  97                 $memory = memory_get_usage();
  98                 $time = $this->getTime();
  99
 100                 if( $wgDebugFunctionEntry ){
 101                         $this->debug( str_repeat( ' ', count( $this->mWorkStack ) - 1 ) . 'Exiting ' . $functionname . "\n" );
 102                 }
 103
 104                 $bit = array_pop($this->mWorkStack);
 105
 106                 if (!$bit) {
 107                         $this->debug("Profiling error, !\$bit: $functionname\n");
 108                 } else {
 109                         //if( $wgDebugProfiling ){
 110                                 if( $functionname == 'close' ){
 111                                         $message = "Profile section ended by close(): {$bit[0]}";
 112                                         $this->debug( "$message\n" );
 113                                         $this->mStack[] = array( $message, 0, '0 0', 0, '0 0', 0 );
 114                                 }
 115                                 elseif( $bit[0] != $functionname ){
 116                                         $message = "Profiling error: in({$bit[0]}), out($functionname)";
 117                                         $this->debug( "$message\n" );
 118                                         $this->mStack[] = array( $message, 0, '0 0', 0, '0 0', 0 );
 119                                 }
 120                         //}
 121                         $bit[] = $time;
 122                         $bit[] = $memory;
 123                         $this->mStack[] = $bit;
 124                 }
 125         }
 126
 127         /**
 128          * called by wfProfileClose()
 129          */
 130         function close() {
 131                 while( count( $this->mWorkStack ) ){
 132                         $this->profileOut( 'close' );
 133                 }
 134         }
 135
 136         /**
 137          * called by wfGetProfilingOutput()
 138          */
 139         function getOutput() {
 140                 global $wgDebugFunctionEntry, $wgProfileCallTree;
 141                 $wgDebugFunctionEntry = false;
 142
 143                 if( !count( $this->mStack ) && !count( $this->mCollated ) ){
 144                         return "No profiling output\n";
 145                 }
 146                 $this->close();
 147
 148                 if( $wgProfileCallTree ){
 149                         return $this->getCallTree();
 150                 } else {
 151                         return $this->getFunctionReport();
 152                 }
 153         }
 154
 155         /**
 156          * returns a tree of function call instead of a list of functions
 157          */
 158         function getCallTree() {
 159                 return implode( '', array_map( array( &$this, 'getCallTreeLine' ), $this->remapCallTree( $this->mStack ) ) );
 160         }
 161
 162         /**
 163          * Recursive function the format the current profiling array into a tree
 164          *
 165          * @param $stack profiling array
 166          */
 167         function remapCallTree( $stack ) {
 168                 if( count( $stack ) < 2 ){
 169                         return $stack;
 170                 }
 171                 $outputs = array ();
 172                 for( $max = count( $stack ) - 1; $max > 0; ){
 173                         /* Find all items under this entry */
 174                         $level = $stack[$max][1];
 175                         $working = array ();
 176                         for( $i = $max -1; $i >= 0; $i-- ){
 177                                 if( $stack[$i][1] > $level ){
 178                                         $working[] = $stack[$i];
 179                                 } else {
 180                                         break;
 181                                 }
 182                         }
 183                         $working = $this->remapCallTree( array_reverse( $working ) );
 184                         $output = array();
 185                         foreach( $working as $item ){
 186                                 array_push( $output, $item );
 187                         }
 188                         array_unshift( $output, $stack[$max] );
 189                         $max = $i;
 190
 191                         array_unshift( $outputs, $output );
 192                 }
 193                 $final = array();
 194                 foreach( $outputs as $output ){
 195                         foreach( $output as $item ){
 196                                 $final[] = $item;
 197                         }
 198                 }
 199                 return $final;
 200         }
 201
 202         /**
 203          * Callback to get a formatted line for the call tree
 204          */
 205         function getCallTreeLine($entry) {
 206                 list( $fname, $level, $start, /* $x */, $end)  = $entry;
 207                 $delta = $end - $start;
 208                 $space = str_repeat(' ', $level);
 209
 210                 # The ugly double sprintf is to work around a PHP bug,
 211                 # which has been fixed in recent releases.
 212                 return sprintf( "%10s %s %s\n",
 213                         trim( sprintf( "%7.3f", $delta * 1000.0 ) ),
 214                         $space, $fname );
 215         }
 216
 217         function getTime() {
 218                 return microtime(true);
 219                 #return $this->getUserTime();
 220         }
 221
 222         function getUserTime() {
 223                 $ru = getrusage();
 224                 return $ru['ru_utime.tv_sec'].' '.$ru['ru_utime.tv_usec'] / 1e6;
 225         }
 226
 227         /**
 228          * Returns a list of profiled functions.
 229          * Also log it into the database if $wgProfileToDatabase is set to true.
 230          */
 231         function getFunctionReport() {
 232                 global $wgProfileToDatabase;
 233
 234                 $width = 140;
 235                 $nameWidth = $width - 65;
 236                 $format =      "%-{$nameWidth}s %6d %13.3f %13.3f %13.3f%% %9d  (%13.3f -%13.3f) [%d]\n";
 237                 $titleFormat = "%-{$nameWidth}s %6s %13s %13s %13s %9s\n";
 238                 $prof = "\nProfiling data\n";
 239                 $prof .= sprintf( $titleFormat, 'Name', 'Calls', 'Total', 'Each', '%', 'Mem' );
 240                 $this->mCollated = array ();
 241                 $this->mCalls = array ();
 242                 $this->mMemory = array ();
 243
 244                 # Estimate profiling overhead
 245                 $profileCount = count($this->mStack);
 246                 wfProfileIn( '-overhead-total' );
 247                 for( $i = 0; $i < $profileCount; $i ++ ){
 248                         wfProfileIn( '-overhead-internal' );
 249                         wfProfileOut( '-overhead-internal' );
 250                 }
 251                 wfProfileOut( '-overhead-total' );
 252
 253                 # First, subtract the overhead!
 254                 foreach( $this->mStack as $entry ){
 255                         $fname = $entry[0];
 256                         $start = $entry[2];
 257                         $end = $entry[4];
 258                         $elapsed = $end - $start;
 259                         $memory = $entry[5] - $entry[3];
 260
 261                         if( $fname == '-overhead-total' ){
 262                                 $overheadTotal[] = $elapsed;
 263                                 $overheadMemory[] = $memory;
 264                         }
 265                         elseif( $fname == '-overhead-internal' ){
 266                                 $overheadInternal[] = $elapsed;
 267                         }
 268                 }
 269                 $overheadTotal = array_sum( $overheadTotal ) / count( $overheadInternal );
 270                 $overheadMemory = array_sum( $overheadMemory ) / count( $overheadInternal );
 271                 $overheadInternal = array_sum( $overheadInternal ) / count( $overheadInternal );
 272
 273                 # Collate
 274                 foreach( $this->mStack as $index => $entry ){
 275                         $fname = $entry[0];
 276                         $start = $entry[2];
 277                         $end = $entry[4];
 278                         $elapsed = $end - $start;
 279
 280                         $memory = $entry[5] - $entry[3];
 281                         $subcalls = $this->calltreeCount( $this->mStack, $index );
 282
 283                         if( !preg_match( '/^-overhead/', $fname ) ){
 284                                 # Adjust for profiling overhead (except special values with elapsed=0
 285                                 if( $elapsed ) {
 286                                         $elapsed -= $overheadInternal;
 287                                         $elapsed -= ($subcalls * $overheadTotal);
 288                                         $memory -= ($subcalls * $overheadMemory);
 289                                 }
 290                         }
 291
 292                         if( !array_key_exists( $fname, $this->mCollated ) ){
 293                                 $this->mCollated[$fname] = 0;
 294                                 $this->mCalls[$fname] = 0;
 295                                 $this->mMemory[$fname] = 0;
 296                                 $this->mMin[$fname] = 1 << 24;
 297                                 $this->mMax[$fname] = 0;
 298                                 $this->mOverhead[$fname] = 0;
 299                         }
 300
 301                         $this->mCollated[$fname] += $elapsed;
 302                         $this->mCalls[$fname]++;
 303                         $this->mMemory[$fname] += $memory;
 304                         $this->mMin[$fname] = min($this->mMin[$fname], $elapsed);
 305                         $this->mMax[$fname] = max($this->mMax[$fname], $elapsed);
 306                         $this->mOverhead[$fname] += $subcalls;
 307                 }
 308
 309                 $total = @$this->mCollated['-total'];
 310                 $this->mCalls['-overhead-total'] = $profileCount;
 311
 312                 # Output
 313                 arsort( $this->mCollated, SORT_NUMERIC );
 314                 foreach( $this->mCollated as $fname => $elapsed ){
 315                         $calls = $this->mCalls[$fname];
 316                         $percent = $total ? 100. * $elapsed / $total : 0;
 317                         $memory = $this->mMemory[$fname];
 318                         $prof .= sprintf($format, substr($fname, 0, $nameWidth), $calls, (float) ($elapsed * 1000), (float) ($elapsed * 1000) / $calls, $percent, $memory, ($this->mMin[$fname] * 1000.0), ($this->mMax[$fname] * 1000.0), $this->mOverhead[$fname]);
 319
 320                         if( $wgProfileToDatabase ){
 321                                 self::logToDB($fname, (float) ($elapsed * 1000), $calls, (float) ($memory) );
 322                         }
 323                 }
 324                 $prof .= "\nTotal: $total\n\n";
 325
 326                 return $prof;
 327         }
 328
 329         /**
 330          * Counts the number of profiled function calls sitting under
 331          * the given point in the call graph. Not the most efficient algo.
 332          *
 333          * @param $stack Array:
 334          * @param $start Integer:
 335          * @return Integer
 336          * @private
 337          */
 338         function calltreeCount($stack, $start) {
 339                 $level = $stack[$start][1];
 340                 $count = 0;
 341                 for ($i = $start -1; $i >= 0 && $stack[$i][1] > $level; $i --) {
 342                         $count ++;
 343                 }
 344                 return $count;
 345         }
 346
 347         /**
 348          * Log a function into the database.
 349          *
 350          * @param $name string: function name
 351          * @param $timeSum float
 352          * @param $eventCount int: number of times that function was called
 353          */
 354         static function logToDB( $name, $timeSum, $eventCount, $memorySum ){
 355                 # Do not log anything if database is readonly (bug 5375)
 356                 if( wfReadOnly() ) { return; }
 357
 358                 global $wgProfilePerHost;
 359
 360                 $dbw = wfGetDB( DB_MASTER );
 361                 if( !is_object( $dbw ) )
 362                         return false;
 363                 $errorState = $dbw->ignoreErrors( true );
 364
 365                 $name = substr($name, 0, 255);
 366
 367                 if( $wgProfilePerHost ){
 368                         $pfhost = wfHostname();
 369                 } else {
 370                         $pfhost = '';
 371                 }
 372
 373                 // Kludge
 374                 $timeSum = ($timeSum >= 0) ? $timeSum : 0;
 375                 $memorySum = ($memorySum >= 0) ? $memorySum : 0;
 376
 377                 $dbw->update( 'profiling',
 378                         array(
 379                                 "pf_count=pf_count+{$eventCount}",
 380                                 "pf_time=pf_time+{$timeSum}",
 381                                 "pf_memory=pf_memory+{$memorySum}",
 382                         ),
 383                         array(
 384                                 'pf_name' => $name,
 385                                 'pf_server' => $pfhost,
 386                         ),
 387                         __METHOD__ );
 388
 389
 390                 $rc = $dbw->affectedRows();
 391                 if ($rc == 0) {
 392                         $dbw->insert('profiling', array ('pf_name' => $name, 'pf_count' => $eventCount,
 393                                 'pf_time' => $timeSum, 'pf_memory' => $memorySum, 'pf_server' => $pfhost ),
 394                                 __METHOD__, array ('IGNORE'));
 395                 }
 396                 // When we upgrade to mysql 4.1, the insert+update
 397                 // can be merged into just a insert with this construct added:
 398                 //     "ON DUPLICATE KEY UPDATE ".
 399                 //     "pf_count=pf_count + VALUES(pf_count), ".
 400                 //     "pf_time=pf_time + VALUES(pf_time)";
 401                 $dbw->ignoreErrors( $errorState );
 402         }
 403
 404         /**
 405          * Get the function name of the current profiling section
 406          */
 407         function getCurrentSection() {
 408                 $elt = end( $this->mWorkStack );
 409                 return $elt[0];
 410         }
 411
 412         /**
 413          * Get function caller
 414          * @param $level int
 415          */
 416         static function getCaller( $level ) {
 417                 $backtrace = wfDebugBacktrace();
 418                 if ( isset( $backtrace[$level] ) ) {
 419                         if ( isset( $backtrace[$level]['class'] ) ) {
 420                                 $caller = $backtrace[$level]['class'] . '::' . $backtrace[$level]['function'];
 421                         } else {
 422                                 $caller = $backtrace[$level]['function'];
 423                         }
 424                 } else {
 425                         $caller = 'unknown';
 426                 }
 427                 return $caller;
 428         }
 429
 430         /**
 431          * Add an entry in the debug log file
 432          * @param $s string to output
 433          */
 434         function debug( $s ) {
 435                 if( function_exists( 'wfDebug' ) ) {
 436                         wfDebug( $s );
 437                 }
 438         }
 439 }