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xhprof_lib.php
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<?php
// Copyright (c) 2009 Facebook
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//
// This file contains various XHProf library (utility) functions.
// Do not add any display specific code here.
//
function xhprof_error($message) {
error_log($message);
}
/*
* The list of possible metrics collected as part of XHProf that
* require inclusive/exclusive handling while reporting.
*
* @author Kannan
*/
function xhprof_get_possible_metrics() {
static $possible_metrics =
array("wt" => array("Wall", "microsecs", "walltime" ),
"ut" => array("User", "microsecs", "user cpu time" ),
"st" => array("Sys", "microsecs", "system cpu time"),
"cpu" => array("Cpu", "microsecs", "cpu time"),
"mu" => array("MUse", "bytes", "memory usage"),
"pmu" => array("PMUse", "bytes", "peak memory usage"),
"samples" => array("Samples", "samples", "cpu time"));
return $possible_metrics;
}
/*
* Get the list of metrics present in $xhprof_data as an array.
*
* @author Kannan
*/
function xhprof_get_metrics($xhprof_data) {
// get list of valid metrics
$possible_metrics = xhprof_get_possible_metrics();
// return those that are present in the raw data.
// We'll just look at the root of the subtree for this.
$metrics = array();
foreach ($possible_metrics as $metric => $desc) {
if (isset($xhprof_data["main()"][$metric])) {
$metrics[] = $metric;
}
}
return $metrics;
}
/**
* Takes a parent/child function name encoded as
* "a==>b" and returns array("a", "b").
*
* @author Kannan
*/
function xhprof_parse_parent_child($parent_child) {
$ret = explode("==>", $parent_child);
// Return if both parent and child are set
if (isset($ret[1])) {
return $ret;
}
return array(null, $ret[0]);
}
/**
* Given parent & child function name, composes the key
* in the format present in the raw data.
*
* @author Kannan
*/
function xhprof_build_parent_child_key($parent, $child) {
if ($parent) {
return $parent . "==>" . $child;
} else {
return $child;
}
}
/**
* Checks if XHProf raw data appears to be valid and not corrupted.
*
* @param int $run_id Run id of run to be pruned.
* [Used only for reporting errors.]
* @param array $raw_data XHProf raw data to be pruned
* & validated.
*
* @return bool true on success, false on failure
*
* @author Kannan
*/
function xhprof_valid_run($run_id, $raw_data) {
$main_info = $raw_data["main()"];
if (empty($main_info)) {
xhprof_error("XHProf: main() missing in raw data for Run ID: $run_id");
return false;
}
// raw data should contain either wall time or samples information...
if (isset($main_info["wt"])) {
$metric = "wt";
} else if (isset($main_info["samples"])) {
$metric = "samples";
} else {
xhprof_error("XHProf: Wall Time information missing from Run ID: $run_id");
return false;
}
foreach ($raw_data as $info) {
$val = $info[$metric];
// basic sanity checks...
if ($val < 0) {
xhprof_error("XHProf: $metric should not be negative: Run ID $run_id"
. serialize($info));
return false;
}
if ($val > (86400000000)) {
xhprof_error("XHProf: $metric > 1 day found in Run ID: $run_id "
. serialize($info));
return false;
}
}
return true;
}
/**
* Return a trimmed version of the XHProf raw data. Note that the raw
* data contains one entry for each unique parent/child function
* combination.The trimmed version of raw data will only contain
* entries where either the parent or child function is in the list
* of $functions_to_keep.
*
* Note: Function main() is also always kept so that overall totals
* can still be obtained from the trimmed version.
*
* @param array XHProf raw data
* @param array array of function names
*
* @return array Trimmed XHProf Report
*
* @author Kannan
*/
function xhprof_trim_run($raw_data, $functions_to_keep) {
// convert list of functions to a hash with function as the key
$function_map = array_fill_keys($functions_to_keep, 1);
// always keep main() as well so that overall totals can still
// be computed if need be.
$function_map['main()'] = 1;
$new_raw_data = array();
foreach ($raw_data as $parent_child => $info) {
list($parent, $child) = xhprof_parse_parent_child($parent_child);
if (isset($function_map[$parent]) || isset($function_map[$child])) {
$new_raw_data[$parent_child] = $info;
}
}
return $new_raw_data;
}
/**
* Takes raw XHProf data that was aggregated over "$num_runs" number
* of runs averages/nomalizes the data. Essentially the various metrics
* collected are divided by $num_runs.
*
* @author Kannan
*/
function xhprof_normalize_metrics($raw_data, $num_runs) {
if (empty($raw_data) || ($num_runs == 0)) {
return $raw_data;
}
$raw_data_total = array();
if (isset($raw_data["==>main()"]) && isset($raw_data["main()"])) {
xhprof_error("XHProf Error: both ==>main() and main() set in raw data...");
}
foreach ($raw_data as $parent_child => $info) {
foreach ($info as $metric => $value) {
$raw_data_total[$parent_child][$metric] = ($value / $num_runs);
}
}
return $raw_data_total;
}
/**
* Get raw data corresponding to specified array of runs
* aggregated by certain weightage.
*
* Suppose you have run:5 corresponding to page1.php,
* run:6 corresponding to page2.php,
* and run:7 corresponding to page3.php
*
* and you want to accumulate these runs in a 2:4:1 ratio. You
* can do so by calling:
*
* xhprof_aggregate_runs(array(5, 6, 7), array(2, 4, 1));
*
* The above will return raw data for the runs aggregated
* in 2:4:1 ratio.
*
* @param object $xhprof_runs_impl An object that implements
* the iXHProfRuns interface
* @param array $runs run ids of the XHProf runs..
* @param array $wts integral (ideally) weights for $runs
* @param string $source source to fetch raw data for run from
* @param bool $use_script_name If true, a fake edge from main() to
* to __script::<scriptname> is introduced
* in the raw data so that after aggregations
* the script name is still preserved.
*
* @return array Return aggregated raw data
*
* @author Kannan
*/
function xhprof_aggregate_runs($xhprof_runs_impl, $runs,
$wts, $source="phprof",
$use_script_name=false) {
$raw_data_total = null;
$raw_data = null;
$metrics = array();
$run_count = count($runs);
$wts_count = count($wts);
if (($run_count == 0) ||
(($wts_count > 0) && ($run_count != $wts_count))) {
return array('description' => 'Invalid input..',
'raw' => null);
}
$bad_runs = array();
foreach($runs as $idx => $run_id) {
$raw_data = $xhprof_runs_impl->get_run($run_id, $source, $description);
// use the first run to derive what metrics to aggregate on.
if ($idx == 0) {
foreach ($raw_data["main()"] as $metric => $val) {
if ($metric != "pmu") {
// for now, just to keep data size small, skip "peak" memory usage
// data while aggregating.
// The "regular" memory usage data will still be tracked.
if (isset($val)) {
$metrics[] = $metric;
}
}
}
}
if (!xhprof_valid_run($run_id, $raw_data)) {
$bad_runs[] = $run_id;
continue;
}
if ($use_script_name) {
$page = $description;
// create a fake function '__script::$page', and have and edge from
// main() to '__script::$page'. We will also need edges to transfer
// all edges originating from main() to now originate from
// '__script::$page' to all function called from main().
//
// We also weight main() ever so slightly higher so that
// it shows up above the new entry in reports sorted by
// inclusive metrics or call counts.
if ($page) {
foreach($raw_data["main()"] as $metric => $val) {
$fake_edge[$metric] = $val;
$new_main[$metric] = $val + 0.00001;
}
$raw_data["main()"] = $new_main;
$raw_data[xhprof_build_parent_child_key("main()",
"__script::$page")]
= $fake_edge;
} else {
$use_script_name = false;
}
}
// if no weights specified, use 1 as the default weightage..
$wt = ($wts_count == 0) ? 1 : $wts[$idx];
// aggregate $raw_data into $raw_data_total with appropriate weight ($wt)
foreach ($raw_data as $parent_child => $info) {
if ($use_script_name) {
// if this is an old edge originating from main(), it now
// needs to be from '__script::$page'
if (substr($parent_child, 0, 9) == "main()==>") {
$child =substr($parent_child, 9);
// ignore the newly added edge from main()
if (substr($child, 0, 10) != "__script::") {
$parent_child = xhprof_build_parent_child_key("__script::$page",
$child);
}
}
}
if (!isset($raw_data_total[$parent_child])) {
foreach ($metrics as $metric) {
$raw_data_total[$parent_child][$metric] = ($wt * $info[$metric]);
}
} else {
foreach ($metrics as $metric) {
$raw_data_total[$parent_child][$metric] += ($wt * $info[$metric]);
}
}
}
}
$runs_string = implode(",", $runs);
if (isset($wts)) {
$wts_string = "in the ratio (" . implode(":", $wts) . ")";
$normalization_count = array_sum($wts);
} else {
$wts_string = "";
$normalization_count = $run_count;
}
$run_count = $run_count - count($bad_runs);
$data['description'] = "Aggregated Report for $run_count runs: ".
"$runs_string $wts_string\n";
$data['raw'] = xhprof_normalize_metrics($raw_data_total,
$normalization_count);
$data['bad_runs'] = $bad_runs;
return $data;
}
/**
* Analyze hierarchical raw data, and compute per-function (flat)
* inclusive and exclusive metrics.
*
* Also, store overall totals in the 2nd argument.
*
* @param array $raw_data XHProf format raw profiler data.
* @param array &$overall_totals OUT argument for returning
* overall totals for various
* metrics.
* @return array Returns a map from function name to its
* call count and inclusive & exclusive metrics
* (such as wall time, etc.).
*
* @author Kannan Muthukkaruppan
*/
function xhprof_compute_flat_info($raw_data, &$overall_totals) {
global $display_calls;
$metrics = xhprof_get_metrics($raw_data);
$overall_totals = array( "ct" => 0,
"wt" => 0,
"ut" => 0,
"st" => 0,
"cpu" => 0,
"mu" => 0,
"pmu" => 0,
"samples" => 0
);
// compute inclusive times for each function
$symbol_tab = xhprof_compute_inclusive_times($raw_data);
/* total metric value is the metric value for "main()" */
foreach ($metrics as $metric) {
$overall_totals[$metric] = $symbol_tab["main()"][$metric];
}
/*
* initialize exclusive (self) metric value to inclusive metric value
* to start with.
* In the same pass, also add up the total number of function calls.
*/
foreach ($symbol_tab as $symbol => $info) {
foreach ($metrics as $metric) {
$symbol_tab[$symbol]["excl_" . $metric] = $symbol_tab[$symbol][$metric];
}
if ($display_calls) {
/* keep track of total number of calls */
$overall_totals["ct"] += $info["ct"];
}
}
/* adjust exclusive times by deducting inclusive time of children */
foreach ($raw_data as $parent_child => $info) {
list($parent, $child) = xhprof_parse_parent_child($parent_child);
if ($parent) {
foreach ($metrics as $metric) {
// make sure the parent exists hasn't been pruned.
if (isset($symbol_tab[$parent])) {
$symbol_tab[$parent]["excl_" . $metric] -= $info[$metric];
}
}
}
}
return $symbol_tab;
}
/**
* Hierarchical diff:
* Compute and return difference of two call graphs: Run2 - Run1.
*
* @author Kannan
*/
function xhprof_compute_diff($xhprof_data1, $xhprof_data2) {
global $display_calls;
// use the second run to decide what metrics we will do the diff on
$metrics = xhprof_get_metrics($xhprof_data2);
$xhprof_delta = $xhprof_data2;
foreach ($xhprof_data1 as $parent_child => $info) {
if (!isset($xhprof_delta[$parent_child])) {
// this pc combination was not present in run1;
// initialize all values to zero.
if ($display_calls) {
$xhprof_delta[$parent_child] = array("ct" => 0);
} else {
$xhprof_delta[$parent_child] = array();
}
foreach ($metrics as $metric) {
$xhprof_delta[$parent_child][$metric] = 0;
}
}
if ($display_calls) {
$xhprof_delta[$parent_child]["ct"] -= $info["ct"];
}
foreach ($metrics as $metric) {
$xhprof_delta[$parent_child][$metric] -= $info[$metric];
}
}
return $xhprof_delta;
}
/**
* Compute inclusive metrics for function. This code was factored out
* of xhprof_compute_flat_info().
*
* The raw data contains inclusive metrics of a function for each
* unique parent function it is called from. The total inclusive metrics
* for a function is therefore the sum of inclusive metrics for the
* function across all parents.
*
* @return array Returns a map of function name to total (across all parents)
* inclusive metrics for the function.
*
* @author Kannan
*/
function xhprof_compute_inclusive_times($raw_data) {
global $display_calls;
$metrics = xhprof_get_metrics($raw_data);
$symbol_tab = array();
/*
* First compute inclusive time for each function and total
* call count for each function across all parents the
* function is called from.
*/
foreach ($raw_data as $parent_child => $info) {
list($parent, $child) = xhprof_parse_parent_child($parent_child);
if ($parent == $child) {
/*
* XHProf PHP extension should never trigger this situation any more.
* Recursion is handled in the XHProf PHP extension by giving nested
* calls a unique recursion-depth appended name (for example, foo@1).
*/
xhprof_error("Error in Raw Data: parent & child are both: $parent");
return;
}
if (!isset($symbol_tab[$child])) {
if ($display_calls) {
$symbol_tab[$child] = array("ct" => $info["ct"]);
} else {
$symbol_tab[$child] = array();
}
foreach ($metrics as $metric) {
$symbol_tab[$child][$metric] = $info[$metric];
}
} else {
if ($display_calls) {
/* increment call count for this child */
$symbol_tab[$child]["ct"] += $info["ct"];
}
/* update inclusive times/metric for this child */
foreach ($metrics as $metric) {
$symbol_tab[$child][$metric] += $info[$metric];
}
}
}
return $symbol_tab;
}
/*
* Prunes XHProf raw data:
*
* Any node whose inclusive walltime accounts for less than $prune_percent
* of total walltime is pruned. [It is possible that a child function isn't
* pruned, but one or more of its parents get pruned. In such cases, when
* viewing the child function's hierarchical information, the cost due to
* the pruned parent(s) will be attributed to a special function/symbol
* "__pruned__()".]
*
* @param array $raw_data XHProf raw data to be pruned & validated.
* @param double $prune_percent Any edges that account for less than
* $prune_percent of time will be pruned
* from the raw data.
*
* @return array Returns the pruned raw data.
*
* @author Kannan
*/
function xhprof_prune_run($raw_data, $prune_percent) {
$main_info = $raw_data["main()"];
if (empty($main_info)) {
xhprof_error("XHProf: main() missing in raw data");
return false;
}
// raw data should contain either wall time or samples information...
if (isset($main_info["wt"])) {
$prune_metric = "wt";
} else if (isset($main_info["samples"])) {
$prune_metric = "samples";
} else {
xhprof_error("XHProf: for main() we must have either wt "
."or samples attribute set");
return false;
}
// determine the metrics present in the raw data..
$metrics = array();
foreach ($main_info as $metric => $val) {
if (isset($val)) {
$metrics[] = $metric;
}
}
$prune_threshold = (($main_info[$prune_metric] * $prune_percent) / 100.0);
init_metrics($raw_data, null, null, false);
$flat_info = xhprof_compute_inclusive_times($raw_data);
foreach ($raw_data as $parent_child => $info) {
list($parent, $child) = xhprof_parse_parent_child($parent_child);
// is this child's overall total from all parents less than threshold?
if ($flat_info[$child][$prune_metric] < $prune_threshold) {
unset($raw_data[$parent_child]); // prune the edge
} else if ($parent &&
($parent != "__pruned__()") &&
($flat_info[$parent][$prune_metric] < $prune_threshold)) {
// Parent's overall inclusive metric is less than a threshold.
// All edges to the parent node will get nuked, and this child will
// be a dangling child.
// So instead change its parent to be a special function __pruned__().
$pruned_edge = xhprof_build_parent_child_key("__pruned__()", $child);
if (isset($raw_data[$pruned_edge])) {
foreach ($metrics as $metric) {
$raw_data[$pruned_edge][$metric]+=$raw_data[$parent_child][$metric];
}
} else {
$raw_data[$pruned_edge] = $raw_data[$parent_child];
}
unset($raw_data[$parent_child]); // prune the edge
}
}
return $raw_data;
}
/**
* Set one key in an array and return the array
*
* @author Kannan
*/
function xhprof_array_set($arr, $k, $v) {
$arr[$k] = $v;
return $arr;
}
/**
* Removes/unsets one key in an array and return the array
*
* @author Kannan
*/
function xhprof_array_unset($arr, $k) {
unset($arr[$k]);
return $arr;
}
/**
* Type definitions for URL params
*/
define('XHPROF_STRING_PARAM', 1);
define('XHPROF_UINT_PARAM', 2);
define('XHPROF_FLOAT_PARAM', 3);
define('XHPROF_BOOL_PARAM', 4);
/**
* Internal helper function used by various
* xhprof_get_param* flavors for various
* types of parameters.
*
* @param string name of the URL query string param
*
* @author Kannan
*/
function xhprof_get_param_helper($param) {
$val = null;
if (isset($_GET[$param]))
$val = $_GET[$param];
else if (isset($_POST[$param])) {
$val = $_POST[$param];
}
return $val;
}
/**
* Extracts value for string param $param from query
* string. If param is not specified, return the
* $default value.
*
* @author Kannan
*/
function xhprof_get_string_param($param, $default = '') {
$val = xhprof_get_param_helper($param);
if ($val === null)
return $default;
return $val;
}
/**
* Extracts value for unsigned integer param $param from
* query string. If param is not specified, return the
* $default value.
*
* If value is not a valid unsigned integer, logs error
* and returns null.
*
* @author Kannan
*/
function xhprof_get_uint_param($param, $default = 0) {
$val = xhprof_get_param_helper($param);
if ($val === null)
$val = $default;
// trim leading/trailing whitespace
$val = trim($val);
// if it only contains digits, then ok..
if (ctype_digit($val)) {
return $val;
}
xhprof_error("$param is $val. It must be an unsigned integer.");
return null;
}
/**
* Extracts value for a float param $param from
* query string. If param is not specified, return
* the $default value.
*
* If value is not a valid unsigned integer, logs error
* and returns null.
*
* @author Kannan
*/
function xhprof_get_float_param($param, $default = 0) {
$val = xhprof_get_param_helper($param);
if ($val === null)
$val = $default;
// trim leading/trailing whitespace
$val = trim($val);
// TBD: confirm the value is indeed a float.
if (true) // for now..
return (float)$val;
xhprof_error("$param is $val. It must be a float.");
return null;
}
/**
* Extracts value for a boolean param $param from
* query string. If param is not specified, return
* the $default value.
*
* If value is not a valid unsigned integer, logs error
* and returns null.
*
* @author Kannan
*/
function xhprof_get_bool_param($param, $default = false) {
$val = xhprof_get_param_helper($param);
if ($val === null)
$val = $default;
// trim leading/trailing whitespace
$val = trim($val);
switch (strtolower($val)) {
case '0':
case '1':
$val = (bool)$val;
break;
case 'true':
case 'on':
case 'yes':
$val = true;
break;
case 'false':
case 'off':
case 'no':
$val = false;
break;
default:
xhprof_error("$param is $val. It must be a valid boolean string.");
return null;
}
return $val;
}
/**
* Initialize params from URL query string. The function
* creates globals variables for each of the params
* and if the URL query string doesn't specify a particular
* param initializes them with the corresponding default
* value specified in the input.
*
* @params array $params An array whose keys are the names
* of URL params who value needs to
* be retrieved from the URL query
* string. PHP globals are created
* with these names. The value is
* itself an array with 2-elems (the
* param type, and its default value).
* If a param is not specified in the
* query string the default value is
* used.
* @author Kannan
*/
function xhprof_param_init($params) {
/* Create variables specified in $params keys, init defaults */
foreach ($params as $k => $v) {
switch ($v[0]) {
case XHPROF_STRING_PARAM:
$p = xhprof_get_string_param($k, $v[1]);
break;
case XHPROF_UINT_PARAM:
$p = xhprof_get_uint_param($k, $v[1]);
break;
case XHPROF_FLOAT_PARAM:
$p = xhprof_get_float_param($k, $v[1]);
break;
case XHPROF_BOOL_PARAM:
$p = xhprof_get_bool_param($k, $v[1]);
break;
default:
xhprof_error("Invalid param type passed to xhprof_param_init: "
. $v[0]);
exit();
}
// create a global variable using the parameter name.
$GLOBALS[$k] = $p;
}
}
/**
* Given a partial query string $q return matching function names in
* specified XHProf run. This is used for the type ahead function
* selector.
*
* @author Kannan
*/
function xhprof_get_matching_functions($q, $xhprof_data) {
$matches = array();
foreach ($xhprof_data as $parent_child => $info) {
list($parent, $child) = xhprof_parse_parent_child($parent_child);
if (stripos($parent, $q) !== false) {
$matches[$parent] = 1;
}
if (stripos($child, $q) !== false) {
$matches[$child] = 1;
}
}
$res = array_keys($matches);
// sort it so the answers are in some reliable order...
asort($res);
return ($res);
}
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