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<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black">Hello
<span class="SpellE">Yash</span>,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black">I’ve done experiments with LTO/PGO on
<span class="SpellE">PyPy</span>, but because you have a JIT enabled, they are useless. Let me detail this a bit more.
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black">LTO and PGO works on
<span class="SpellE">CPython</span> and gives the performance you mentioned, because the code is not dynamic in nature, you only have a large codebase, with a lot of C code, some used, some duplicated, etc. Therefore any way the static code can be optimized
at compile/link time, will bring benefits.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black">On the other hand, if you enable LTO/PGO on non-JIT version of
<span class="SpellE">PyPy</span>, you get impressive results, with up to 15% compared with the baseline (<span class="SpellE">PyPy</span> no JIT), but no one uses
<span class="SpellE">PyPy</span> that way. Without JIT, <span class="SpellE">PyPy</span> it’s slower than
<span class="SpellE">CPython</span>.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black">If you enable the JIT and use LTO/PGO you actually get no overall performance
gain, but performance degrading, depending on the workload you are using. For example, on the Grand Unified Python Benchmark (GUPB), the number of benchmarks that have a speedup and slowdown are about even, in the range +/-3%, as measured on our
<span class="SpellE">Haswell</span> systems. These results are not unexpected or weird, since doing PGO/LTO on other projects, such as Node.JS or HHVM, which also feature a JIT, got to the same outcome.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black">Regards,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black">Alecsandru<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-bidi-font-family:"Times New Roman";color:black"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><a name="_____replyseparator"></a><b><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-font-family:"Times New Roman";font-weight:bold">From:</span></font></b><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-font-family:"Times New Roman"">
<span class="SpellE">pypy</span>-dev [mailto:pypy-dev-bounces+alecsandru.patrascu=intel.com@python.org]
<b><span style="font-weight:bold">On Behalf Of </span></b>Singh, Yashwardhan<br>
<b><span style="font-weight:bold">Sent:</span></b> Tuesday, August 2, 2016 2:31 AM<br>
<b><span style="font-weight:bold">To:</span></b> pypy-dev@python.org<br>
<b><span style="font-weight:bold">Subject:</span></b> [<span class="SpellE">pypy</span>-dev] PGO Optimized
<span class="SpellE">PyPy</span> Built<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;mso-fareast-font-family:"Times New Roman";color:black">Hi Everyone,<br>
<br>
I was wondering if someone has tried to build <span class="SpellE">pypy</span> using PGO ( Profile Guided Optimization) and LTO (Link Time Optimization).
<span class="SpellE">CPython</span> has an option of building the binary using PGO and LTO, which gives performance speedup
<span class="SpellE">upto</span> 26% on some of the GUPB benchmarks, with average gain of 10% over the whole benchmark suite.<br>
<a href="http://bugs.python.org/issue24915" target="_blank">http://bugs.python.org/issue24915</a><br>
<br>
Regards<br>
<span class="SpellE">Yash</span> <o:p></o:p></span></font></p>
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