Re^4: Convert string to array - performance challenge

I see some variablility, but nothing like those levels using AS perls.

AS1007 64-bit:

c:\test>junk
           Rate    regex unpack_C unpack_a    split
regex    7.95/s       --      -1%     -10%     -14%
unpack_C 8.01/s       1%       --     -10%     -14%
unpack_a 8.88/s      12%      11%       --      -4%
split    9.30/s      17%      16%       5%       --

c:\test>junk
           Rate    regex unpack_C unpack_a    split
regex    7.95/s       --      -0%      -8%     -12%
unpack_C 7.95/s       0%       --      -8%     -12%
unpack_a 8.68/s       9%       9%       --      -4%
split    9.09/s      14%      14%       5%       --

c:\test>junk
           Rate unpack_C    regex unpack_a    split
unpack_C 8.02/s       --      -0%      -9%     -11%
regex    8.02/s       0%       --      -9%     -11%
unpack_a 8.81/s      10%      10%       --      -2%
split    9.02/s      13%      13%       2%       --

c:\test>junk
           Rate unpack_C    regex unpack_a    split
unpack_C 7.95/s       --      -0%      -9%     -13%
regex    7.95/s       0%       --      -9%     -13%
unpack_a 8.74/s      10%      10%       --      -5%
split    9.16/s      15%      15%       5%       --
[download]

AS826 32-bit:

c:\test>\perl32\bin\perl junk.pl
           Rate unpack_C    split    regex unpack_a
unpack_C 8.38/s       --      -5%      -9%     -15%
split    8.81/s       5%       --      -5%     -11%
regex    9.23/s      10%       5%       --      -6%
unpack_a 9.86/s      18%      12%       7%       --

c:\test>\perl32\bin\perl junk.pl
           Rate unpack_C    split    regex unpack_a
unpack_C 8.45/s       --      -5%      -8%     -15%
split    8.87/s       5%       --      -3%     -11%
regex    9.16/s       8%       3%       --      -8%
unpack_a 9.94/s      18%      12%       9%       --

c:\test>\perl32\bin\perl junk.pl
           Rate unpack_C    split    regex unpack_a
unpack_C 8.38/s       --      -5%      -8%     -14%
split    8.81/s       5%       --      -4%     -10%
regex    9.16/s       9%       4%       --      -6%
unpack_a 9.78/s      17%      11%       7%       --

c:\test>\perl32\bin\perl junk.pl
           Rate unpack_C    split    regex unpack_a
unpack_C 8.38/s       --      -5%      -8%     -14%
split    8.81/s       5%       --      -4%     -10%
regex    9.16/s       9%       4%       --      -6%
unpack_a 9.78/s      17%      11%       7%       --
[download]

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Comment on Re^4: Convert string to array - performance challenge Select or Download Code

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Re^5: Convert string to array - performance challenge by ikegami (Patriarch) on Apr 08, 2010 at 16:54 UTC
`split //` was optimised to not use the regex engine on 9 Aug 2007. The 5.8 build you are using probably predates that. I got the same variability between regex and unpack_C with 5.10. They are basically equivalent in terms of performance.	[reply] [d/l]