Re^2: Faster and more efficient way to read a file vertically

"...It looks like the more efficient choice would be to use unpack..."

I'm not so sure. As you wrote:

$ perl test.pl
              Rate unpack substr  split
unpack 171232877/s     --   -23%   -31%
substr 223713647/s    31%     --   -10%
split  248138958/s    45%    11%     --
[download]

Ergo:

karls-mac-mini:monks karl$ perl -e 'printf ("%.1f\n", 248138958/171232
+877);'
1.4
[download]

As i wrote at Re^6: Question on Regex:

"...use cmpthese, the results are sorted from slow to fast..."

Sorry in advance if i ~~did something wrong~~ missed something.

Best regards, Karl

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Re^3: Faster and more efficient way to read a file vertically
by thanos1983 (Parson) on Nov 06, 2017 at 09:43 UTC

Hello karlgoethebier,

You are absolutely right. I also read the Benchmark/Optional-Exports where is clearly stated:

cmpthese ( COUNT, CODEHASHREF, [ STYLE ] )

Optionally calls timethese(), then outputs comparison chart. This:
    cmpthese( -1, { a => "++\$i", b => "\$i *= 2" } ) ;
outputs a chart like:
           Rate    b    a
    b 2831802/s   -- -61%
    a 7208959/s 155%   --
[download]

This chart is sorted from slowest to fastest, and shows the percent speed difference between each pair of tests. cmpthese can also be passed the data structure that timethese() returns:

Thanks for correcting me I will also update my answer. Although to be honest I am kind of impressed how unpack is slower in comparison to substr and split.

Thanks again for your time and effort, BR.

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