icuSources/test/perf/howExpensiveIs/readme.txt

   1 # -*- mode: org -*-
   2 # Copyright (C) 2012 International Business Machines Corporation and Others. All Rights Reserved.
   3
   4 How Expensive Is It?
   5
   6 * Introduction
   7 ** The purpose of this test is to answer the question, "How expensive, relatively speaking, is ICU operation X?"
   8 ** ICU tests are compared with general purpose CPU operations to attempt to factor out differences between systems and load conditions
   9 ** Different ICU operations will have different levels of dependence on CPU, memory, disk, etc. So nothing can perfectly factor these conditions out.
  10 * Running the Test
  11 ** Simply run "make check" in this directory, icu/source/test/perf/howExpensiveIs/
  12 ** Try to minimize other CPU loading throughout the test
  13 ** The test will take some time to run!
  14 ** Test runs outside of a margin of error will be thrown out. So, this will tend to produce more accurate results.
  15 ** After some time, the file howexpensive.xml will be created (an example is attached as Appendix I)
  16 ** The results may be read directly or processed such as with xslt.
  17 ** XML file contents:
  18 *** Element <tests>: the outermost element.
  19 *** Attribute 'icu':  gives the basic ICU version number.
  20 **** Element <test>: a particularized test.
  21 ***** Attribute 'name': names the particular test, see howExpensiveIs.cpp for details
  22 ***** Attribute 'standardizedTime': The SieveTest by definition has a standardized test of 1, it runs a prime number sieve as a benchmark. All other standardizedTimes are normalized against this value.
  23 ***** Attribute 'realDuration': the actual duration, in seconds, of the test.
  24 ***** Attribute 'marginOfError': the amount +/- error for the real duration. Gives an idea of how much variability was in the test.
  25 ***** Attribute 'iterations': gives the total number of iterations run.
  26 **** Element <icuSystemParams>: This element gives the full details of the target platform, in the XML format produced by the 'icuinfo' tool.  The contents are informative only and not documented here.
  27 * Analysis
  28 ** The data shows that, for example, parsing a number and opening the GB18030 converter are about the same cost. It also shows that opening a number formatter is about 60 times as expensive as formatting a number.
  29 ** Appendix II shows a .CSV (spreadsheet) file which shows analysis of a sample run between different systems.
  30 ** The Variation column for each Target system was calculated with the formula:  "(Control-Target)/Control" where Control and Target are the standardized times for the Control and Target systems, respectively.
  31 * Appendices
  32 ** Appendix I: Sample File
  33 <?xml version="1.0" encoding="UTF-8" ?>
  34 <tests icu="49.0.2">
  35 <!--  Copyright (C) 2011, International Business Machines Corporation and others. All Rights Reserved.  -->
  36    <test name="SieveTest" standardizedTime="1.000000" realDuration="0.022804" marginOfError="0.000073" iterations="1000000" />
  37    <test name="NullTest" standardizedTime="0.000017" realDuration="0.000000" marginOfError="0.000000" iterations="1000000" />
  38    <test name="NumParseTest" standardizedTime="77.869922" realDuration="1.775721" marginOfError="0.011742" iterations="1000000" />
  39    <test name="Test_unum_opendefault" standardizedTime="4855.974258" realDuration="110.734117" marginOfError="0.057131" iterations="1000000" />
  40    <test name="Test_ucnv_opengb18030" standardizedTime="70.488403" realDuration="1.607395" marginOfError="0.009261" iterations="1000000" />
  41  <icuSystemParams type="icu4c">
  42     <param name="copyright"> Copyright (C) 2011, International Business Machines Corporation and others. All Rights Reserved. </param>
  43     <param name="product">icu4c</param>
  44     <param name="product.full">International Components for Unicode for C/C++</param>
  45     <param name="version">49.0.2</param>
  46     <param name="version.unicode">6.1</param>
  47     <param name="platform.number">4000</param>
  48     <param name="platform.type">Other (POSIX-like)</param>
  49     <param name="locale.default">en_US</param>
  50     <param name="locale.default.bcp47">en-US</param>
  51     <param name="converter.default">UTF-8</param>
  52     <param name="icudata.name">icudt49l</param>
  53     <param name="icudata.path">../../data/out/build/icudt49l</param>
  54     <param name="cldr.version">21.0</param>
  55     <param name="tz.version">2011n</param>
  56     <param name="tz.default">America/Los_Angeles</param>
  57     <param name="cpu.bits">64</param>
  58     <param name="cpu.big_endian">0</param>
  59     <param name="os.wchar_width">4</param>
  60     <param name="os.charset_family">0</param>
  61     <param name="os.host">x86_64-unknown-linux-gnu</param>
  62     <param name="build.build">x86_64-unknown-linux-gnu</param>
  63     <param name="build.cc">gcc</param>
  64     <param name="build.cxx">g++</param>
  65  </icuSystemParams>
  66 </tests>
  67 ** Appendix II: Analysis.csv
  68 http://bugs.icu-project.org/trac/ticket/8653,"""Control"", linux i7
  69 Intel(R) Core(TM) i7-2720QM CPU @ 2.20GHz",MacBook 2.4ghz (Core2D),MacBook 2GhzCore2,AIX Power,MB 2.4 Variance,MB 2 variance,AIX Variance
  70 SieveTest (=1.0),1,1,1,1,0.00%,0.00%,0.00%
  71 NullTest (=0.0),0,0,0,0.08,#DIV/0!,#DIV/0!,#DIV/0!
  72 NumParseTest,74.10642,21.220191493,56.912133,85.423525612,71.37%,23.20%,-15.27%
  73 Test_unum_opendefault,4801.617798,1912.860018319,4522.900036,2580.805294162,60.16%,5.80%,46.25%
  74 Test_ucnv_opengb18030,65.268309,30.547740077,84.075584,51.587649619,53.20%,-28.82%,20.96%
  75 Test_unum_openpattern,4394.214773,1735.453339382,4472.298154,2263.471671239,60.51%,-1.78%,48.49%
  76 Test_ures_openroot,75.302253,23.773982586,71.248439,57.471889114,68.43%,5.38%,23.68%
  77 ** Appendix III: Revision History
  78 *** Feb 2012, ICU 49, srl: First revision