blog/Coz_can_help_you_find_bottlenecks_in_multi_threaded_software___nice_free_software.html

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   6     <title>Petter Reinholdtsen: Coz can help you find bottlenecks in multi-threaded software - nice free software</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">Coz can help you find bottlenecks in multi-threaded software - nice free software</div>
  24       <div class="date">11th August 2016</div>
  25       <div class="body"><p>This summer, I read a great article
  26 "<a href="https://www.usenix.org/publications/login/summer2016/curtsinger">coz:
  27 This Is the Profiler You're Looking For</a>" in USENIX ;login: about
  28 how to profile multi-threaded programs.  It presented a system for
  29 profiling software by running experiences in the running program,
  30 testing how run time performance is affected by "speeding up" parts of
  31 the code to various degrees compared to a normal run.  It does this by
  32 slowing down parallel threads while the "faster up" code is running
  33 and measure how this affect processing time.  The processing time is
  34 measured using probes inserted into the code, either using progress
  35 counters (COZ_PROGRESS) or as latency meters (COZ_BEGIN/COZ_END).  It
  36 can also measure unmodified code by measuring complete the program
  37 runtime and running the program several times instead.</p>
  38
  39 <p>The project and presentation was so inspiring that I would like to
  40 get the system into Debian.  I
  41 <a href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=830708">created
  42 a WNPP request for it</a> and contacted upstream to try to make the
  43 system ready for Debian by sending patches.  The build process need to
  44 be changed a bit to avoid running 'git clone' to get dependencies, and
  45 to include the JavaScript web page used to visualize the collected
  46 profiling information included in the source package.
  47 But I expect that should work out fairly soon.</p>
  48
  49 <p>The way the system work is fairly simple.  To run an coz experiment
  50 on a binary with debug symbols available, start the program like this:
  51
  52 <p><blockquote><pre>
  53 coz run --- program-to-run
  54 </pre></blockquote></p>
  55
  56 <p>This will create a text file profile.coz with the instrumentation
  57 information.  To show what part of the code affect the performance
  58 most, use a web browser and either point it to
  59 <a href="http://plasma-umass.github.io/coz/">http://plasma-umass.github.io/coz/</a>
  60 or use the copy from git (in the gh-pages branch).  Check out this web
  61 site to have a look at several example profiling runs and get an idea what the end result from the profile runs look like.  To make the
  62 profiling more useful you include &lt;coz.h&gt; and insert the
  63 COZ_PROGRESS or COZ_BEGIN and COZ_END at appropriate places in the
  64 code, rebuild and run the profiler.  This allow coz to do more
  65 targeted experiments.</p>
  66
  67 <p>A video published by ACM
  68 <a href="https://www.youtube.com/watch?v=jE0V-p1odPg">presenting the
  69 Coz profiler</a> is available from Youtube.  There is also a paper
  70 from the 25th Symposium on Operating Systems Principles available
  71 titled
  72 <a href="https://www.usenix.org/conference/atc16/technical-sessions/presentation/curtsinger">Coz:
  73 finding code that counts with causal profiling</a>.</p>
  74
  75 <p><a href="https://github.com/plasma-umass/coz">The source code</a>
  76 for Coz is available from github.  It will only build with clang
  77 because it uses a
  78 <a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55606">C++
  79 feature missing in GCC</a>, but I've submitted
  80 <a href="https://github.com/plasma-umass/coz/pull/67">a patch to solve
  81 it</a> and hope it will be included in the upstream source soon.</p>
  82
  83 <p>Please get in touch if you, like me, would like to see this piece
  84 of software in Debian.  I would very much like some help with the
  85 packaging effort, as I lack the in depth knowledge on how to package
  86 C++ libraries.</p>
  87 </div>
  88
  89       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software</a>.</div>
  90
  91
  92     </div>
  93
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 101 <h2>Archive</h2>
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 298
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 358
 359 <li>2008
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 361
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 363
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 367
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 369
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 459  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
 460
 461  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 462
 463  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (5)</a></li>
 464
 465  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 466
 467  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (53)</a></li>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (55)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (52)</a></li>
 480
 481  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (3)</a></li>
 482
 483  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 484
 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (59)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (40)</a></li>
 492
 493 </ul>
 494
 495
 496     </div>
 497     <p style="text-align: right">
 498  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 499 </p>
 500
 501   </body>
 502 </html>