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Full Discussion: Performance issue with 'grep' command for huge file size
Operating Systems HP-UX Performance issue with 'grep' command for huge file size Post 302574542 by rwuerth on Thursday 17th of November 2011 12:51:38 PM
Old 11-17-2011
Don't use a loop to get this done, your processing the 2.5GB details.txt file for each name in emp.txt. So if you had 2 names in emp.txt your processing 5GB of detail.txt. 10 names = 25GB. It doesn't scale well that way.

Try this:

Code:
 
grep -F -f emp.txt details.txt

Then you are only processing details.txt once, and of course however big emp.txt is.

Using -F might also save some time. If you don't have the '-F' option look for 'fgrep'.
But being on HP-UX the standard 'grep' should have the -F option available.
Last edited by rwuerth; 11-17-2011 at 01:59 PM.. Reason: I'm scatter brained today. Keep thinking of things to add, after the fact.
These 2 Users Gave Thanks to rwuerth For This Post:
arb_1984 thanhdat
 

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LEARN ABOUT DEBIAN

gtkdoc-mktmpl

gtkdoc-mktmpl(1)					      General Commands Manual						  gtkdoc-mktmpl(1)

NAME

       gtkdoc-mktmpl --  GTK DocBook documentation generator.

SYNOPSIS

       gtkdoc-mktmpl [ See below ]

DESCRIPTION

       gtkdoc-mktmpl This creates or updates the template files which contain the manually-edited documentation. (A template is a simple text form
       which is filled in with the description of a function, macro, enum, or struct.  For functions  and  macros  it  also  contains  fields  for
       describing the parameters.)

       This script reads in the existing templates, found in tmpl/*.sgml, moves these files to tmpl/*.sgml.bak, and then recreates the .sgml files
       according to the structure given in the file MODULE-sections.txt.

       Any new templates added, or new function parameters, are marked with FIXME so you can do a grep to see which parts need updating.

       Any templates which are no longer used (i.e. they are remove from MODULE-sections.txt) are placed in the  file  tmpl/MODULE-unused.txt.	If
       they are included again later they are automatically copied back into position.	If you are certain that these templates will never be used
       again you can delete them from MODULE-unused.txt.

       Any parameters to functions which are no longer used are separated from the rest of the parameters with the line <!-- # Unused Parameters #
       -->.  It  may  be  that	the parameter name has just been changed, in which case you can copy the description to the parameter with the new
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EXAMPLE

       See /usr/share/doc/gtk-doc-tools/examples, for a makefile.am and a configure.in example file.

AUTHOR

       This manual page was written by Christian Marillat marillat@debian.org for the Debian GNU/Linux system (but may be used by others).

																  gtkdoc-mktmpl(1)
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