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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 DEBIAN

ddisna

ddisna.f(3)							      LAPACK							       ddisna.f(3)

NAME

       ddisna.f -

SYNOPSIS

   Functions/Subroutines
       subroutine ddisna (JOB, M, N, D, SEP, INFO)
	   DDISNA

Function/Subroutine Documentation
   subroutine ddisna (characterJOB, integerM, integerN, double precision, dimension( * )D, double precision, dimension( * )SEP, integerINFO)
       DDISNA

       Purpose:

	    DDISNA computes the reciprocal condition numbers for the eigenvectors
	    of a real symmetric or complex Hermitian matrix or for the left or
	    right singular vectors of a general m-by-n matrix. The reciprocal
	    condition number is the 'gap' between the corresponding eigenvalue or
	    singular value and the nearest other one.

	    The bound on the error, measured by angle in radians, in the I-th
	    computed vector is given by

		   DLAMCH( 'E' ) * ( ANORM / SEP( I ) )

	    where ANORM = 2-norm(A) = max( abs( D(j) ) ).  SEP(I) is not allowed
	    to be smaller than DLAMCH( 'E' )*ANORM in order to limit the size of
	    the error bound.

	    DDISNA may also be used to compute error bounds for eigenvectors of
	    the generalized symmetric definite eigenproblem.

       Parameters:
	   JOB

		     JOB is CHARACTER*1
		     Specifies for which problem the reciprocal condition numbers
		     should be computed:
		     = 'E':  the eigenvectors of a symmetric/Hermitian matrix;
		     = 'L':  the left singular vectors of a general matrix;
		     = 'R':  the right singular vectors of a general matrix.

	   M

		     M is INTEGER
		     The number of rows of the matrix. M >= 0.

	   N

		     N is INTEGER
		     If JOB = 'L' or 'R', the number of columns of the matrix,
		     in which case N >= 0. Ignored if JOB = 'E'.

	   D

		     D is DOUBLE PRECISION array, dimension (M) if JOB = 'E'
					 dimension (min(M,N)) if JOB = 'L' or 'R'
		     The eigenvalues (if JOB = 'E') or singular values (if JOB =
		     'L' or 'R') of the matrix, in either increasing or decreasing
		     order. If singular values, they must be non-negative.

	   SEP

		     SEP is DOUBLE PRECISION array, dimension (M) if JOB = 'E'
					  dimension (min(M,N)) if JOB = 'L' or 'R'
		     The reciprocal condition numbers of the vectors.

	   INFO

		     INFO is INTEGER
		     = 0:  successful exit.
		     < 0:  if INFO = -i, the i-th argument had an illegal value.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 118 of file ddisna.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						       ddisna.f(3)
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