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365 Million L3 Misses.

Started by	Jeff-Relf.Me @.
First post	2018-04-14 07:58 -0700
Last post	2018-04-14 07:58 -0700
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  365 Million L3 Misses. Jeff-Relf.Me  @. - 2018-04-14 07:58 -0700

#681019 — 365 Million L3 Misses.

From	Jeff-Relf.Me @.
Date	2018-04-14 07:58 -0700
Subject	365 Million L3 Misses.
Message-ID	<Jeff-Relf.Me@Apr.14--7.58am.Seattle.2018>

BranimirMaksimovic replied:
> for( i = 0; i < _16k; ++i ) for( j = 0; j < _16k; ++j ) mat[ j*_16k + i ] = 42 ;
> Loop1:  3.659 Seconds     5  Million L3 Misses
> Loop2:   .327 Seconds

  Loop1:  2.485 Seconds   365  Million L3 Misses  ( 430 - 65 )
  Loop2:   .080 Seconds

I've no way of knowing L4 misses; my L4 is 128 MegaBytes.

I had to compile GitHub's "Performance Counter Monitor"
as I couldn't find "PCM.EXE", Googling.
WinRing0x64.DLL/.SYS had to be downloaded, as they must be signed.

I sample for 11 seconds because it takes me at least 5 seconds
to (manually) start the Loop1 test;  65 Million Misses is normal
for this amount of time ( 11 seconds, 430 - 65  = 365 ).

    PCM  11 -i=1 -ns -nsys -nc

A ReSet ( -r ) might be required, if there's a conflict.
I ran it -many- times, to be sure that I got the right averages.

To compile it, I had to add a "#include" and
change some compiler/linker switches.  Also:

    Visual Studio -> Solution Explorer -> RightClick Solution
    -> ReTarget Solution -> to pick a "Windows SDK".

    Put my "Include", "Lib" paths in my "Microsoft.Cpp.Win32.user.props.TXT";
    Copied it too "%LocalAppData%\Microsoft\MSBuild\v4.0\";
    Removed the ".TXT" extension and ReSarted Visual Studio;
    so the CodeEditor knows where my Includes are.

    Also, I put them in:  Solution Explorer -> Select all projects
      -> Settings -> Configuration Properties -> VC++ Directories.

Jeff-Relf.Me/Microsoft.Cpp.Win32.user.props.TXT

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365 Million L3 Misses.

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#681019 — 365 Million L3 Misses.