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Full Discussion: Text string parsing in awk
Top Forums Shell Programming and Scripting Text string parsing in awk Post 302892640 by Chubler_XL on Friday 14th of March 2014 12:08:45 AM
Old 03-14-2014
On my system those two version were pretty much the same, not that the one that is run first is faster due to caching, etc but after that they were indistinguishable on performance

I did get some about a 50% reduction in runtime using index and substr:

Code:
awk '
{   alarm = $0
    p=index(alarm, " ")
    q=index(substr(alarm,p), " ")+p
    r=index(substr(alarm,q), " ")+q
    s=index(substr(alarm,r), " ")+r
    chem = substr(alarm, s)
    ent = substr(alarm,r,s-r-1)
    print "ent=" ent " chem=" chem
}' file

With 1 Million records average times were Original 10.580s; Don 10.430s; This 6.190s
This User Gave Thanks to Chubler_XL For This Post:
Michael Stora
 

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LEARN ABOUT DEBIAN

alarm

ALARM(2)						     Linux Programmer's Manual							  ALARM(2)

NAME

       alarm - set an alarm clock for delivery of a signal

SYNOPSIS

       #include <unistd.h>

       unsigned int alarm(unsigned int seconds);

DESCRIPTION

       alarm() arranges for a SIGALRM signal to be delivered to the calling process in seconds seconds.

       If seconds is zero, no new alarm() is scheduled.

       In any event any previously set alarm() is canceled.

RETURN VALUE

       alarm()	returns the number of seconds remaining until any previously scheduled alarm was due to be delivered, or zero if there was no pre-
       viously scheduled alarm.

CONFORMING TO

       SVr4, POSIX.1-2001, 4.3BSD.

NOTES

       alarm() and setitimer(2) share the same timer; calls to one will interfere with use of the other.

       sleep(3) may be implemented using SIGALRM; mixing calls to alarm() and sleep(3) is a bad idea.

       Scheduling delays can, as ever, cause the execution of the process to be delayed by an arbitrary amount of time.

SEE ALSO

       gettimeofday(2), pause(2), select(2), setitimer(2), sigaction(2), signal(2), sleep(3), time(7)

COLOPHON

       This page is part of release 3.44 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2008-06-12								  ALARM(2)
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