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Full Discussion: Why is cut slower than awk?
Top Forums UNIX for Advanced & Expert Users Why is cut slower than awk? Post 302284246 by BandGap on Thursday 5th of February 2009 05:10:26 AM
Old 02-05-2009
Why is cut slower than awk?

Hi all,

for test reasons I tried the following two one-liners:

Code:
time awk '{print $4}' T_64xSC_128RW_K500.dat > /dev/null

and

Code:
time cut -d" " -f6 T_64xSC_128RW_K500.dat > /dev/null

The file contains approx. 250k lines. awk does it in 0.15 secs (real), cut in 0.44. The user time has about the same relation, whereas the sys time is almost identical in both cases.

The fact that awk is almost 8 times larger than cut (in kB) seems to make no difference.

Why is cut almost 4 times slower?

Cheers,
BG
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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