gecko/layout/tools/pageloader/report.js

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is tp.
*
* The Initial Developer of the Original Code is
* Mozilla Corporation.
* Portions created by the Initial Developer are Copyright (C) 2007
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@meer.net>
* Rob Helmer <rhelmer@mozilla.com>
* Vladimir Vukicevic <vladimir@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
// Constructor
function Report(pages) {
this.pages = pages;
this.timeVals = new Array(pages.length); // matrix of times
for (var i = 0; i < this.timeVals.length; ++i) {
this.timeVals[i] = new Array();
}
this.totalCCTime = 0;
this.showTotalCCTime = false;
}
// given an array of strings, finds the longest common prefix
function findCommonPrefixLength(strs) {
if (strs.length < 2)
return 0;
var len = 0;
do {
var newlen = len + 1;
var newprefix = null;
var failed = false;
for (var i = 0; i < strs.length; i++) {
if (newlen > strs[i].length) {
failed = true;
break;
}
var s = strs[i].substr(0, newlen);
if (newprefix == null) {
newprefix = s;
} else if (newprefix != s) {
failed = true;
break;
}
}
if (failed)
break;
len++;
} while (true);
return len;
}
function compareNumbers(a, b) {
return a - b;
}
// returns an object with the following properties:
// min : min value of array elements
// max : max value of array elements
// mean : mean value of array elements
// vari : variance computation
// stdd : standard deviation, sqrt(vari)
// indexOfMax : index of max element (the element that is
// removed from the mean computation)
function getArrayStats(ary) {
var r = {};
r.min = ary[0];
r.max = ary[0];
r.indexOfMax = 0;
var sum = 0;
for (var i = 0; i < ary.length; ++i) {
if (ary[i] < r.min) {
r.min = ary[i];
} else if (ary[i] > r.max) {
r.max = ary[i];
r.indexOfMax = i;
}
sum = sum + ary[i];
}
// median
if (ary.length > 1) {
sorted_ary = ary.concat();
sorted_ary.sort(compareNumbers);
// remove longest run
sorted_ary.pop();
if (sorted_ary.length%2) {
r.median = sorted_ary[(sorted_ary.length-1)/2];
}else{
var n = Math.floor(sorted_ary.length / 2);
if (n >= sorted_ary.length)
r.median = sorted_ary[n];
else
r.median = (sorted_ary[n-1] + sorted_ary[n]) / 2;
}
}else{
r.median = ary[0];
}
// ignore max value when computing mean and stddev
if (ary.length > 1)
r.mean = (sum - r.max) / (ary.length - 1);
else
r.mean = ary[0];
r.vari = 0;
for (var i = 0; i < ary.length; ++i) {
if (i == r.indexOfMax)
continue;
var d = r.mean - ary[i];
r.vari = r.vari + d * d;
}
if (ary.length > 1) {
r.vari = r.vari / (ary.length - 1);
r.stdd = Math.sqrt(r.vari);
} else {
r.vari = 0.0;
r.stdd = 0.0;
}
return r;
}
function strPad(o, len, left) {
var str = o.toString();
if (!len)
len = 6;
if (left == null)
left = true;
if (str.length < len) {
len -= str.length;
while (--len) {
if (left)
str = " " + str;
else
str += " ";
}
}
str += " ";
return str;
}
function strPadFixed(n, len, left) {
return strPad(n.toFixed(0), len, left);
}
Report.prototype.getReport = function(format) {
// avg and avg median are cumulative for all the pages
var avgs = new Array();
var medians = new Array();
for (var i = 0; i < this.timeVals.length; ++i) {
avgs[i] = getArrayStats(this.timeVals[i]).mean;
medians[i] = getArrayStats(this.timeVals[i]).median;
}
var avg = getArrayStats(avgs).mean;
var avgmed = getArrayStats(medians).mean;
var report;
var prefixLen = findCommonPrefixLength(this.pages);
if (format == "js") {
// output "simple" js format;
// array of { page: "str", value: 123.4, stddev: 23.3 } objects
report = "([";
for (var i = 0; i < this.timeVals.length; i++) {
var stats = getArrayStats(this.timeVals[i]);
report += uneval({ page: this.pages[i].substr(prefixLen), value: stats.mean, stddev: stats.stdd});
report += ",";
}
report += "])";
} else if (format == "jsfull") {
// output "full" js format, with raw values
} else if (format == "text") {
// output text format suitable for dumping
report = "============================================================\n";
report += " " + strPad("Page", 40, false) + strPad("mean") + strPad("stdd") + strPad("min") + strPad("max") + "raw" + "\n";
for (var i = 0; i < this.timeVals.length; i++) {
var stats = getArrayStats(this.timeVals[i]);
report +=
strPad(i, 4, true) +
strPad(this.pages[i].substr(prefixLen), 40, false) +
strPadFixed(stats.mean) +
strPadFixed(stats.stdd) +
strPadFixed(stats.min) +
strPadFixed(stats.max) +
this.timeVals[i] +
"\n";
}
if (this.showTotalCCTime) {
report += "Cycle collection: " + this.totalCCTime + "\n"
}
report += "============================================================\n";
} else if (format == "tinderbox") {
report = "__start_tp_report\n";
report += "_x_x_mozilla_page_load,"+avgmed+",NaN,NaN\n"; // max and min are just 0, ignored
report += "_x_x_mozilla_page_load_details,avgmedian|"+avgmed+"|average|"+avg.toFixed(2)+"|minimum|NaN|maximum|NaN|stddev|NaN\n";
report += "|i|pagename|median|mean|min|max|runs|\n";
for (var i = 0; i < this.timeVals.length; i++) {
var r = getArrayStats(this.timeVals[i]);
report += '|'+
i + ';'+
this.pages[i].substr(prefixLen) + ';'+
r.median + ';'+
r.mean + ';'+
r.min + ';'+
r.max + ';'+
this.timeVals[i].join(";") +
"\n";
}
report += "__end_tp_report\n";
if (this.showTotalCCTime) {
report += "__start_cc_report\n";
report += "_x_x_mozilla_cycle_collect," + this.totalCCTime + "\n";
report += "__end_cc_report\n";
}
var now = (new Date()).getTime();
report += "__startTimestamp" + now + "__endTimestamp\n"; //timestamp for determning shutdown time, used by talos
} else {
report = "Unknown report format";
}
return report;
}
Report.prototype.recordTime = function(pageIndex, ms) {
this.timeVals[pageIndex].push(ms);
}
Report.prototype.recordCCTime = function(ms) {
this.totalCCTime += ms;
this.showTotalCCTime = true;
}