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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I don’t doubt V8 is great. I’m just saying claiming that it can beat an optimizing C compiler on anything significant sounds a bit strange </span><span style='font-size:11.0pt;font-family:Wingdings;color:#1F497D'>J</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>-Michael<o:p></o:p></span></p><p class=MsoNormal><a name="_MailEndCompose"><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></a></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> freeswitch-dev-bounces@lists.freeswitch.org [mailto:freeswitch-dev-bounces@lists.freeswitch.org] <b>On Behalf Of </b>Jan Berger<br><b>Sent:</b> Sunday, July 04, 2010 2:26 AM<br><b>To:</b> freeswitch-dev@lists.freeswitch.org<br><b>Subject:</b> Re: [Freeswitch-dev] V8 Performance Tests<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>These tests can be a bit missleading.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Anyway – using the benchmark test on V8’s own test below: Try running it on Chrome, and after that you try running it on Opera 10.60<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>The JavaScript in Opera 10.60 gives a higher score in my laptop.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=NO-BOK><a href="http://v8.googlecode.com/svn/data/benchmarks/v5/run.html"><span lang=EN-GB>http://v8.googlecode.com/svn/data/benchmarks/v5/run.html</span></a></span><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>---<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>V8 is however really good from an implementation point of view. Using is as a script engine for an app is very straight forward unless you need threaded apps.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>V8 is a Multiprocessing by design, but it is not goof on multithreading.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Threaded access to V8 is supported, but you need to lock V8 while access some parts of it (not all) – and it’s a bit of work to get this part right.<o:p></o:p></span></p><div><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="100%" align=center></div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> freeswitch-dev-bounces@lists.freeswitch.org [mailto:freeswitch-dev-bounces@lists.freeswitch.org] <b>On Behalf Of </b>Michael Giagnocavo<br><b>Sent:</b> 3. juli 2010 04:59<br><b>To:</b> freeswitch-dev@lists.freeswitch.org<br><b>Subject:</b> Re: [Freeswitch-dev] V8 Performance Tests</span><o:p></o:p></p></div><p class=MsoNormal><span lang=NO-BOK><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://shootout.alioth.debian.org/u32/benchmark.php?test=all&lang=v8&lang2=gcc">http://shootout.alioth.debian.org/u32/benchmark.php?test=all&lang=v8&lang2=gcc</a> ?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> freeswitch-dev-bounces@lists.freeswitch.org [mailto:freeswitch-dev-bounces@lists.freeswitch.org] <b>On Behalf Of </b>Jan Berger<br><b>Sent:</b> Friday, July 02, 2010 5:45 PM<br><b>To:</b> freeswitch-dev@lists.freeswitch.org<br><b>Subject:</b> [Freeswitch-dev] V8 Performance Tests<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Did a quick and dirty performance test comparing C, C++ and V8. This is not a valid benchmark in any way, it is only a test to give me a feeling about how “slow” V8 is compared to pure C and C++.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The code also executed in the same loop and C/C++ tests was in a separate function so all 3 tests had exactly the same overhead in the C++ part.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New"'>C : 1,4 Mill/sec <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New"'>C++: 0.8 Mill/sec<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New"'>V8 Run Only: 0,8 Mill/Sec<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New"'>V8 Compile+Run: 0,4 Mill/sec<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New"'>Other tests will show other differences – this is just an indication that V8 actually might compare with C/C++ performance wise + their memory handling look promissing.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New"'>Threads ? They use globals and statics that will not thread that easy if you atteempt to thread V8 itself – I need to experiment and see.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New"'>Jan<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p></div></body></html>