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<?php
/**
* 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
*/
use Wikimedia\RunningStat;
/**
* Convenience class for working with XHProf profiling data
* <https://github.com/phacility/xhprof>. XHProf can be installed via PECL.
*
* @copyright © 2014 Wikimedia Foundation and contributors
* @since 1.28
*/
class XhprofData {
/**
* @var array
*/
protected $config;
/**
* Hierarchical profiling data returned by xhprof.
* @var array[]
*/
protected $hieraData;
/**
* Per-function inclusive data.
* @var array[][]
*/
protected $inclusive;
/**
* Per-function inclusive and exclusive data.
* @var array[]
*/
protected $complete;
/**
* Configuration data can contain:
* - include: Array of function names to include in profiling.
* - sort: Key to sort per-function reports on.
*
* @param array $data Xhprof profiling data, as returned by xhprof_disable()
* @param array $config
*/
public function __construct( array $data, array $config = [] ) {
$this->config = array_merge( [
'include' => null,
'sort' => 'wt',
], $config );
$this->hieraData = $this->pruneData( $data );
}
/**
* Get raw data collected by xhprof.
*
* Each key in the returned array is an edge label for the call graph in
* the form "caller==>callee". There is once special case edge labeled
* simply "main()" which represents the global scope entry point of the
* application.
*
* XHProf will collect different data depending on the flags that are used:
* - ct: Number of matching events seen.
* - wt: Inclusive elapsed wall time for this event in microseconds.
* - cpu: Inclusive elapsed cpu time for this event in microseconds.
* (XHPROF_FLAGS_CPU)
* - mu: Delta of memory usage from start to end of callee in bytes.
* (XHPROF_FLAGS_MEMORY)
* - pmu: Delta of peak memory usage from start to end of callee in
* bytes. (XHPROF_FLAGS_MEMORY)
* - alloc: Delta of amount memory requested from malloc() by the callee,
* in bytes. (XHPROF_FLAGS_MALLOC)
* - free: Delta of amount of memory passed to free() by the callee, in
* bytes. (XHPROF_FLAGS_MALLOC)
*
* @return array
* @see getInclusiveMetrics()
* @see getCompleteMetrics()
*/
public function getRawData() {
return $this->hieraData;
}
/**
* Convert an xhprof data key into an array of ['parent', 'child']
* function names.
*
* The resulting array is left padded with nulls, so a key
* with no parent (eg 'main()') will return [null, 'function'].
*
* @param string $key
* @return array
*/
public static function splitKey( $key ) {
return array_pad( explode( '==>', $key, 2 ), -2, null );
}
/**
* Remove data for functions that are not included in the 'include'
* configuration array.
*
* @param array[] $data Raw xhprof data
* @return array[]
*/
protected function pruneData( $data ) {
if ( !$this->config['include'] ) {
return $data;
}
$want = array_fill_keys( $this->config['include'], true );
$want['main()'] = true;
$keep = [];
foreach ( $data as $key => $stats ) {
[ $parent, $child ] = self::splitKey( $key );
if ( isset( $want[$parent] ) || isset( $want[$child] ) ) {
$keep[$key] = $stats;
}
}
return $keep;
}
/**
* Get the inclusive metrics for each function call. Inclusive metrics
* for given function include the metrics for all functions that were
* called from that function during the measurement period.
*
* See getRawData() for a description of the metric that are returned for
* each function call. The values for the wt, cpu, mu and pmu metrics are
* arrays with these values:
* - total: Cumulative value
* - min: Minimum value
* - mean: Mean (average) value
* - max: Maximum value
* - variance: Variance (spread) of the values
*
* @return array[][]
* @see getRawData()
* @see getCompleteMetrics()
*/
public function getInclusiveMetrics() {
if ( $this->inclusive === null ) {
$main = $this->hieraData['main()'];
$hasCpu = isset( $main['cpu'] );
$hasMu = isset( $main['mu'] );
$hasAlloc = isset( $main['alloc'] );
$inclusive = [];
foreach ( $this->hieraData as $key => $stats ) {
[ , $child ] = self::splitKey( $key );
if ( !isset( $inclusive[$child] ) ) {
$inclusive[$child] = [
'ct' => 0,
'wt' => new RunningStat(),
];
if ( $hasCpu ) {
$inclusive[$child]['cpu'] = new RunningStat();
}
if ( $hasMu ) {
$inclusive[$child]['mu'] = new RunningStat();
$inclusive[$child]['pmu'] = new RunningStat();
}
if ( $hasAlloc ) {
$inclusive[$child]['alloc'] = new RunningStat();
$inclusive[$child]['free'] = new RunningStat();
}
}
$inclusive[$child]['ct'] += $stats['ct'];
foreach ( $stats as $stat => $value ) {
if ( $stat === 'ct' ) {
continue;
}
if ( !isset( $inclusive[$child][$stat] ) ) {
// Ignore unknown stats
continue;
}
for ( $i = 0; $i < $stats['ct']; $i++ ) {
$inclusive[$child][$stat]->addObservation(
$value / $stats['ct']
);
}
}
}
// Convert RunningStat instances to static arrays and add
// percentage stats.
foreach ( $inclusive as $func => $stats ) {
foreach ( $stats as $name => $value ) {
if ( $value instanceof RunningStat ) {
$total = $value->getMean() * $value->getCount();
$percent = ( isset( $main[$name] ) && $main[$name] )
? 100 * $total / $main[$name]
: 0;
$inclusive[$func][$name] = [
'total' => $total,
'min' => $value->min,
'mean' => $value->getMean(),
'max' => $value->max,
'variance' => $value->m2,
'percent' => $percent,
];
}
}
}
uasort( $inclusive, self::makeSortFunction(
$this->config['sort'], 'total'
) );
$this->inclusive = $inclusive;
}
return $this->inclusive;
}
/**
* Get the inclusive and exclusive metrics for each function call.
*
* In addition to the normal data contained in the inclusive metrics, the
* metrics have an additional 'exclusive' measurement which is the total
* minus the totals of all child function calls.
*
* @return array[]
* @see getRawData()
* @see getInclusiveMetrics()
*/
public function getCompleteMetrics() {
if ( $this->complete === null ) {
// Start with inclusive data
$this->complete = $this->getInclusiveMetrics();
foreach ( $this->complete as $func => $stats ) {
foreach ( $stats as $stat => $value ) {
if ( $stat === 'ct' ) {
continue;
}
// Initialize exclusive data with inclusive totals
$this->complete[$func][$stat]['exclusive'] = $value['total'];
}
// Add space for call tree information to be filled in later
$this->complete[$func]['calls'] = [];
$this->complete[$func]['subcalls'] = [];
}
foreach ( $this->hieraData as $key => $stats ) {
[ $parent, $child ] = self::splitKey( $key );
if ( $parent !== null ) {
// Track call tree information
$this->complete[$child]['calls'][$parent] = $stats;
$this->complete[$parent]['subcalls'][$child] = $stats;
}
if ( isset( $this->complete[$parent] ) ) {
// Deduct child inclusive data from exclusive data
foreach ( $stats as $stat => $value ) {
if ( $stat === 'ct' ) {
continue;
}
if ( !isset( $this->complete[$parent][$stat] ) ) {
// Ignore unknown stats
continue;
}
$this->complete[$parent][$stat]['exclusive'] -= $value;
}
}
}
uasort( $this->complete, self::makeSortFunction(
$this->config['sort'], 'exclusive'
) );
}
return $this->complete;
}
/**
* Get a list of all callers of a given function.
*
* @param string $function Function name
* @return array
* @see getEdges()
*/
public function getCallers( $function ) {
$edges = $this->getCompleteMetrics();
if ( isset( $edges[$function]['calls'] ) ) {
return array_keys( $edges[$function]['calls'] );
} else {
return [];
}
}
/**
* Get a list of all callees from a given function.
*
* @param string $function Function name
* @return array
* @see getEdges()
*/
public function getCallees( $function ) {
$edges = $this->getCompleteMetrics();
if ( isset( $edges[$function]['subcalls'] ) ) {
return array_keys( $edges[$function]['subcalls'] );
} else {
return [];
}
}
/**
* Find the critical path for the given metric.
*
* @param string $metric Metric to find critical path for
* @return array
*/
public function getCriticalPath( $metric = 'wt' ) {
$func = 'main()';
$path = [
$func => $this->hieraData[$func],
];
while ( $func ) {
$callees = $this->getCallees( $func );
$maxCallee = null;
$maxCall = null;
foreach ( $callees as $callee ) {
$call = "{$func}==>{$callee}";
if ( $maxCall === null ||
$this->hieraData[$call][$metric] >
$this->hieraData[$maxCall][$metric]
) {
$maxCallee = $callee;
$maxCall = $call;
}
}
if ( $maxCall !== null ) {
$path[$maxCall] = $this->hieraData[$maxCall];
}
$func = $maxCallee;
}
return $path;
}
/**
* Make a closure to use as a sort function. The resulting function will
* sort by descending numeric values (largest value first).
*
* @param string $key Data key to sort on
* @param string $sub Sub key to sort array values on
* @return Closure
*/
public static function makeSortFunction( $key, $sub ) {
return static function ( $a, $b ) use ( $key, $sub ) {
if ( isset( $a[$key] ) && isset( $b[$key] ) ) {
// Descending sort: larger values will be first in result.
// Values for 'main()' will not have sub keys
$valA = is_array( $a[$key] ) ? $a[$key][$sub] : $a[$key];
$valB = is_array( $b[$key] ) ? $b[$key][$sub] : $b[$key];
return $valB <=> $valA;
} else {
// Sort datum with the key before those without
return isset( $a[$key] ) ? -1 : 1;
}
};
}
}