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<?php
/**
* Copyright 2014 Wikimedia Foundation and contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Profiler that captures all function calls from the XHProf PHP extension.
*
* This extension can be installed via PECL or your operating system's package manager.
* This also supports the Tideways-XHProf PHP extension.
*
* @ingroup Profiler
* @see $wgProfiler
* @see https://php.net/xhprof
* @see https://github.com/tideways/php-xhprof-extension
*/
class ProfilerXhprof extends Profiler {
/**
* @var XhprofData|null
*/
protected $xhprofData;
/**
* Profiler for explicit, arbitrary, frame labels
* @var SectionProfiler
*/
protected $sprofiler;
/**
* @see $wgProfiler
* @param array $params Associative array of parameters:
* - int flags: Bitmask of constants from the XHProf or Tideways-XHProf extension
* that will be passed to its enable function,
* such as `XHPROF_FLAGS_CPU | XHPROF_FLAGS_MEMORY | XHPROF_FLAGS_NO_BUILTINS`.
* With Tideways-XHProf, use `TIDEWAYS_XHPROF_FLAGS_*` instead.
* - bool running: If true, it is assumed that the enable function was already
* called. The `flags` option is ignored in this case.
* This exists for use with a custom web entrypoint from which the profiler
* is started before MediaWiki is included.
* - array include: If set, only function names matching a pattern in this
* array will be reported. The pattern strings will be matched using
* the PHP fnmatch() function.
* - array exclude: If set, function names matching an exact name in this
* will be skipped over by XHProf. Ignored functions become transparent
* in the profile. For example, `foo=>ignored=>bar` becomes `foo=>bar`.
* This option is backed by XHProf's `ignored_functions` option.
*
* **Note:** The `exclude` option is not supported in Tideways-XHProf.
*/
public function __construct( array $params = [] ) {
parent::__construct( $params );
// See T180183 and T247332 for why we need the 'running' option.
if ( empty( $params['running'] ) ) {
$flags = $params['flags'] ?? 0;
if ( function_exists( 'xhprof_enable' ) ) {
$options = isset( $params['exclude'] )
? [ 'ignored_functions' => $params['exclude'] ]
: [];
xhprof_enable( $flags, $options );
} elseif ( function_exists( 'tideways_xhprof_enable' ) ) {
if ( isset( $params['exclude'] ) ) {
throw new RuntimeException( 'The exclude option is not supported in tideways_xhprof' );
}
tideways_xhprof_enable( $flags );
} else {
throw new RuntimeException( 'Neither xhprof nor tideways_xhprof is installed' );
}
}
$this->sprofiler = new SectionProfiler();
}
/**
* @return XhprofData
*/
public function getXhprofData() {
if ( !$this->xhprofData ) {
if ( function_exists( 'xhprof_disable' ) ) {
$data = xhprof_disable();
} elseif ( function_exists( 'tideways_xhprof_disable' ) ) {
$data = tideways_xhprof_disable();
} else {
throw new RuntimeException( 'Neither xhprof nor tideways_xhprof is installed' );
}
$this->xhprofData = new XhprofData( $data, $this->params );
}
return $this->xhprofData;
}
public function scopedProfileIn( $section ) {
$key = 'section.' . ltrim( $section, '.' );
return $this->sprofiler->scopedProfileIn( $key );
}
/**
* No-op for xhprof profiling.
*/
public function close() {
}
/**
* Check if a function or section should be excluded from the output.
*
* @param string $name Function or section name.
* @return bool
*/
private function shouldExclude( $name ) {
if ( $name === '-total' ) {
return true;
}
if ( !empty( $this->params['include'] ) ) {
foreach ( $this->params['include'] as $pattern ) {
if ( fnmatch( $pattern, $name, FNM_NOESCAPE ) ) {
return false;
}
}
return true;
}
if ( !empty( $this->params['exclude'] ) ) {
foreach ( $this->params['exclude'] as $pattern ) {
if ( fnmatch( $pattern, $name, FNM_NOESCAPE ) ) {
return true;
}
}
}
return false;
}
public function getFunctionStats() {
$metrics = $this->getXhprofData()->getCompleteMetrics();
$profile = [];
$main = null; // units in ms
foreach ( $metrics as $fname => $stats ) {
if ( $this->shouldExclude( $fname ) ) {
continue;
}
// Convert elapsed times from μs to ms to match interface
$entry = [
'name' => $fname,
'calls' => $stats['ct'],
'real' => $stats['wt']['total'] / 1000,
'%real' => $stats['wt']['percent'],
'cpu' => ( $stats['cpu']['total'] ?? 0 ) / 1000,
'%cpu' => $stats['cpu']['percent'] ?? 0,
'memory' => $stats['mu']['total'] ?? 0,
'%memory' => $stats['mu']['percent'] ?? 0,
'min_real' => $stats['wt']['min'] / 1000,
'max_real' => $stats['wt']['max'] / 1000
];
$profile[] = $entry;
if ( $fname === 'main()' ) {
$main = $entry;
}
}
// Merge in all of the custom profile sections
foreach ( $this->sprofiler->getFunctionStats() as $stats ) {
if ( $this->shouldExclude( $stats['name'] ) ) {
continue;
}
// @note: getFunctionStats() values already in ms
$stats['%real'] = $main['real'] ? $stats['real'] / $main['real'] * 100 : 0;
$stats['%cpu'] = $main['cpu'] ? $stats['cpu'] / $main['cpu'] * 100 : 0;
$stats['%memory'] = $main['memory'] ? $stats['memory'] / $main['memory'] * 100 : 0;
$profile[] = $stats; // assume no section names collide with $metrics
}
return $profile;
}
/**
* Returns a profiling output to be stored in debug file
*
* @return string
*/
public function getOutput() {
return $this->getFunctionReport();
}
/**
* Get a report of profiled functions sorted by inclusive wall clock time
* in descending order.
*
* Each line of the report includes this data:
* - Function name
* - Number of times function was called
* - Total wall clock time spent in function in microseconds
* - Minimum wall clock time spent in function in microseconds
* - Average wall clock time spent in function in microseconds
* - Maximum wall clock time spent in function in microseconds
* - Percentage of total wall clock time spent in function
* - Total delta of memory usage from start to end of function in bytes
*
* @return string
*/
protected function getFunctionReport() {
$data = $this->getFunctionStats();
usort( $data, static function ( $a, $b ) {
return $b['real'] <=> $a['real']; // descending
} );
$width = 140;
$nameWidth = $width - 65;
$format = "%-{$nameWidth}s %6d %9d %9d %9d %9d %7.3f%% %9d";
$out = [];
$out[] = sprintf( "%-{$nameWidth}s %6s %9s %9s %9s %9s %7s %9s",
'Name', 'Calls', 'Total', 'Min', 'Each', 'Max', '%', 'Mem'
);
foreach ( $data as $stats ) {
$out[] = sprintf( $format,
$stats['name'],
$stats['calls'],
$stats['real'] * 1000,
$stats['min_real'] * 1000,
$stats['real'] / $stats['calls'] * 1000,
$stats['max_real'] * 1000,
$stats['%real'],
$stats['memory']
);
}
return implode( "\n", $out );
}
/**
* Retrieve raw data from xhprof
* @return array
*/
public function getRawData() {
return $this->getXhprofData()->getRawData();
}
}