tests/python/py_ext_0@py_ext/pyfile.xml
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fri, 25 May 2018 18:34:05 +0300
changeset 2168 a66062a205ae
parent 1452 7a2b344de8cf
child 2680 6bfed6757495
permissions -rw-r--r--
Build by default with optimization level -O2 for GCC

before -O0 was used by default, that caused pretty bad performance.

Amd64, i6700k, 4200MHz, GNU/Linux (non-RT kernel), gcc 7.2.0

-------------------------------------
Optimization | EN/ENO |no EN/ENO |
-------------------------------------
default | 11 | 9.5 |
-O3 | 3.9 | 5.2 |
-O2 | 4 | 4.8 |
-Os | 4.1 | 3.5 |
-Ofast | 3.9 | 5.2 |
-------------------------------------

ARM, BBB Cortex-A8, 600Mhz, GNU/Linux, gcc 4.6.3

-------------------------------------
Optimization | EN/ENO |no EN/ENO |
-------------------------------------
default | 273 | 226 |
-O3 | 141.8 | 106.2 |
-O2 | 142 | 107 |
-Os | 152.5 | 112.2 |
-Ofast | 141.7 | 106.2 |
-------------------------------------

For embedded systems with size constaints (like Cortex-Mx, AVR and so
on) I usually use -Os. It gets pretty good results. For
GNU/Linux-based systems -O2 is usually a good choice, as you see the
test results.
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<?xml version='1.0' encoding='utf-8'?>
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<PyFile xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
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  <variables>
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    <variable name="SomeVarName" type="DINT"/>
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    <variable name="Grumpf" type="STRING"/>
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  </variables>
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  <globals>
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    <xhtml:p><![CDATA[
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print "All python PLC globals variables :", PLCGlobalsDesc
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print "Current extention name :", __ext_name__
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]]></xhtml:p>
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  </globals>
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  <init>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </init>
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  <cleanup>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </cleanup>
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  <start>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </start>
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  <stop>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </stop>
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</PyFile>