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Full Discussion: Perl Array / pattern match large CPU usage
Top Forums Shell Programming and Scripting Perl Array / pattern match large CPU usage Post 302358974 by Donkey25 on Monday 5th of October 2009 11:01:36 AM
Old 10-05-2009
Perl Array / pattern match large CPU usage
Hi,

I have one file in this format

Code:
20  value1
33   value2
56   value3

I have another file in this format:

Code:
34,30-SEP-09,57,100237775,33614510126,2,34
34,30-SEP-09,57,100237775,33620766654,2,34
34,30-SEP-09,108,100237775,33628458122,2,34
34,30-SEP-09,130,100237775,33635266741,2,254
34,30-SEP-09,135,100237775,33634650517,2,254
34,30-SEP-09,149,100237775,33660985888,2,34

What I want to do is for each value in the first column of the first file (lets call it x) I want to print the last column in the 2nd file if the 5th column begins with x.

So for the above, the first value in the first column of the first file is 20. None of the column4 values in the 2nd file begin with 20 so I don't want to print anything. For 33 from the first file I would want to print the value in the last column of the 2nd file for each line e.g 34,34,34,254,254,34.

I have this, it works but my CPU usage for this process is about 30%! Is there a way to make this more efficient?

Code:
#!/usr/local/bin/perl

use lib "/usr/local/include/modules";
use Getopt::Long;
use File::Copy;
use JDFunction;
use JDProcess;
use JDInput;
#use strict;
use FileHandle;
use IO;
use POSIX qw(strftime);
use Time::Local;

$file_name="/export/home/file2";
open(DATA, $file_name) || die ("Could not open file2!");
@my_data=<DATA>;
close(DATA);

$first_file="/export/home/file1";
open $FIRST_DATA, "<", $first_file or die "Could not open first data file";
while ( $line = <$FIRST_DATA> )
{
chomp ($line);
($code, $value) = split(/\t/, $line);

                foreach $line (@my_data)
                {
                chomp($line);
                ($id,$day,$ref,$valuey,$valuez,$evt_type,$subcode)=split(/,/,$line);

                        if ( $valuez =~ /^$code/ )
                        {
                        print "$code, $subcode\n";
                        }
                }

}
close $FIRST_DATA;

If you know a way to make this more efficient I'd be grateful!

Thanks
 

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LEARN ABOUT HPUX

event_class

event_class(5)															    event_class(5)

NAME

       event class file - The file that contains the declaration of an event class.

DESCRIPTION

       Audit events can be logically grouped into event classes.  Event classes are defined in event class files.  An event class file contains an
       event class number and a list of event numbers corresponding to audit events.

       All event class files must be created in the dcelocal/etc/audit/ec directory.

       The name of the event class file becomes the name of the event class.  The recommended naming convention for event class files is:

       dce_server-name_class

       where class is a descriptive text that characterizes the event class.

       Event class files must be write-protected by the local operating system (that is, only administrators should have  write  access  to  these
       files).	Audit clients read these files to maintain an event table in their address space.

       Optionally,  an	event class file can contain a SEP line.  This line contains a list of prefixes of the event numbers in the file.  The SEP
       line speeds up the scanning performed by the Audit clients.  Audit clients which do not have events with one of the  prefixes  listed  will
       not  scan  the event list.  If the SEP line is not provided in the file, Audit clients will have to read the entire file to find out if the
       event class file contains any of their events.

       Empty lines are ignored in the event class file.

       Comments are designated by the number sign (#) placed before the comment text.

   The Event Class File Format
       The format of an event class file is: ECN=event_class_number SEP=prefix_1 prefix_2 ...  # comments start with the  number  sign	event_num-
       ber_1 event_number_2

EXAMPLES

       Following  is  an  example  of  an  event class file for the event class ec_local_authentication: ECN = 0x00000001 SEP = 0x100 # AS_Request
       0x00000100 # TGS_TicketReq 0x00000101 # TGS_RenewReq 0x00000102 # TGS_ValidateReq 0x00000103

																    event_class(5)
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