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Full Discussion: Make awk gsub take value of for loop
Top Forums Shell Programming and Scripting Make awk gsub take value of for loop Post 303014440 by bedtime on Monday 12th of March 2018 12:47:24 PM
Old 03-12-2018
Quote:
Originally Posted by RudiC
This is my personal feeling: It is well known that any dedicated compiled program, be it C, C++, Pascal, or other, usually benefit from increased execution speed compared to e.g. scripts. But there is a tradeoff in terms of flexibility vs. e.g. awk, perl esp. when it comes to text analysis and processing, and adapting / modelling algorithms, for which those were specifically targeted / designed.
I'd be very interested in any results comparing execution times of your C++ with an equivalent awk script, as they both will use the same regex system calls.
I hadn't seen this post, else I'd have responded sooner...

I'm not sure how to set a timer within the awk program to just time the replacing time itself, so the results will be based on the programs opening/searching for the key/replacing text/closing.

The word 'ad' was used as it has a long definition and is close to the beginning of the file (less search time).

The timer program:
Code:
#!/bin/mksh
#
# Run:
#
# $ ./bench.sh '<program> <parameters>' <number of iterations> 
#
# Ex.:
#
# $ ./bench.sh 'lat ad' 1000
#

echo "\nRunning \""$1"\" for" $2 "iterations.\n\nPlease wait...\n"

i=0

time while [ $i -le $2 ]; do /home/user/scripts/$1; i=$(($i + 1)); done

The results:

Awk (regex):
1000x @ 2m08.22s real 2m04.66s user 0m05.01s system

C++ (regex):
1000x @ 15.24s real 0m13.44s user 0m01.53s system (8.4x faster than Awk)

C++ (custom search and replace - I'll post this code on the forum)
1000x @ 3.37s real 0m02.54s user 0m00.62s system (4.5x faster than C++ regex)


Timed within the programs themselves and only timing the search and replace process:

C++ (regex)
1000x @ 12.26s real 0m05.82s user 0m00.00s system
Ram used: 3mb

C++ (custom)
1000x @ 1.66s real 0m01.66s user 0m00.00s system
Ram used: > 1mb
This User Gave Thanks to bedtime For This Post:
RudiC
 

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rtprio

rtprio(1)						      General Commands Manual							 rtprio(1)

NAME

       rtprio - execute process with real-time priority

SYNOPSIS

       priority command [arguments]

       priority

       command [arguments]

DESCRIPTION

       executes  command  with	a  real-time priority, or changes the real-time priority of currently executing process pid.  Real-time priorities
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       ing) importance than non-real-time processes.  See rtprio(2) for more details.

       If  is specified instead of a real-time priority, executes command with a timeshare (non-real-time) priority, or changes the currently exe-
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       If  is  not  specified, command is not scheduled, or pid's real-time priority is not changed, if the user is not a member of a group having
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RETURN VALUE

       returns exit status 0 if command is successfully scheduled or if pid's real-time priority is successfully changed, 1 if command is not exe-
       cutable	or pid does not exist, and 2 if command (pid) lacks real-time capability, or the invoker's effective user ID is not a user who has
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EXAMPLES

       Execute file at a real-time priority of 100:

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AUTHOR

       was developed by HP.

SEE ALSO

       setprivgrp(1M), getprivgrp(2), rtprio(2).

																	 rtprio(1)
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