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Full Discussion: BASH: Script jams Cygwin to 100% CPU -
Top Forums Shell Programming and Scripting BASH: Script jams Cygwin to 100% CPU - Post 302455045 by SilversleevesX on Monday 20th of September 2010 03:54:16 PM
Old 09-20-2010
BASH: Script jams Cygwin to 100% CPU -
I'd like to streamline the code more than a bit to get it to run faster.

There's a thread about this and related issues of mine on the Cygwin mailing-list, but I want to eliminate any chances it might just be inefficient/inelegant/crappy code. A previous run of the same script on both Cygwin and Ubuntu 9.04's GNOME Terminal, using a source file and a list file of equal length and content, had a significant difference in execution time (2m20s versus just under 3/4 of an hour, GNOME:Cygwin).

The code:
Code:
#!/bin/bash
SAVEIFS=$IFS
IFS=$(echo -en "\n\b")

while read 'line';
do
#8-point check:
	cate=$(exiv2 -g Iptc.Application2.Category -Pv $line)
	if [[ "$cate" == "" ]]; then cate2=" Category Tag";fi
	cred=$(exiv2 -g Iptc.Application2.Credit -Pv $line)
	if [[ "$cred" == "" ]]; then cred2=" Credit Tag";fi
	sour=$(exiv2 -g Iptc.Application2.Source -Pv $line)
	if [[ "$sour" == "" ]]; then sour2=" Source Tag";fi
	writ=$(exiv2 -g Iptc.Application2.Writer -Pv $line)
	if [[ "$writ" == "" ]]; then writ2=" Writer Tag";fi
	trans=$(exiv2 -g Iptc.Application2.TransmissionReference -Pv $line)
	if [[ "$trans" == "" ]]; then trans2=" Transmission Reference Tag";fi
	fixid=$(exiv2 -g Iptc.Application2.FixtureId -Pv $line)
	if [[ "$fixid" == "" ]]; then fixid2=" Event/Fixture Identifier Tag";fi
	objnm=$(exiv2 -g Iptc.Application2.ObjectName -Pv $line)
	if [[ "$objnm" == "" ]]; then objnm2=" Object Name Tag";fi
	locn=$(exiv2 -g Iptc.Application2.SubLocation -Pv $line)
	if [[ "$locn" == "" ]]; then locn2=" Location Tag";fi
echo -e "Evaluating File #$x \ $line."
iptc=$(echo $cate2$cred2$sour2$writ2$trans2$fixid2$objnm2$locn2)
case "$iptc" in 
 "" ) ;;
 * ) echo -e "$line:$iptc">>fieldsmissing.txt 
 y=$[y+1]
 ;;
esac
x=$[x+1]
unset cate2
unset cred2
unset sour2
unset writ2
unset trans2
unset fixid2
unset objnm2
unset iptc
done<list.txt
if [ "$y" -gt "0" ]; then
	echo -ne "\n$x JPEG files evaluated,\nwith $y missing some or all of 
their required IPTC tag data.\nFile-by-file is in fieldsmissing.txt.\n"
else 
	echo -ne "\n$x JPEG files evaluated, none missing any required IPTC
 tag data.\nNo new information was written to fieldsmissing.txt.\n"
fi
IFS=$SAVEIFS

I wouldn't pick on this script for any other reason than: since uninstalling one or two binaries from the Cygwin mirrors and from elsewhere, this is the only script (written by YT within the last two months ) that consistently raises CPU usage, as observed in Task Manager by me, to between 94 and 100% usage while it's being executed. Which is Cygwin "biting itself in the a**," to coin a phrase; the longer the cycle time the longer it takes for a script to finish.

Anyone's advice on how to streamline the code would be much appreciated.

BZT
 

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__gnu_pbds::basic_tree

__gnu_pbds::basic_tree< Key, Mapped, Tag, Node_Update, Policy_T__gnu_pbds::basic_tree< Key, Mapped, Tag, Node_Update, Policy_Tl, Allocator >(3cxx)

NAME

       __gnu_pbds::basic_tree< Key, Mapped, Tag, Node_Update, Policy_Tl, Allocator > -

SYNOPSIS

       Inherits __gnu_pbds::container_base< Key, Mapped, Tag, Policy_Tl, Allocator >.

   Public Types
       typedef Allocator allocator_type
       typedef base_type::const_iterator const_iterator
       typedef key_rebind::const_pointer const_key_pointer
       typedef key_rebind::const_reference const_key_reference
       typedef
	   mapped_rebind::const_pointer const_mapped_pointer"
       typedef
	   mapped_rebind::const_reference const_mapped_reference"
       typedef
	   base_type::const_point_iterator const_point_iterator"
       typedef value_rebind::const_pointer const_pointer
       typedef
	   value_rebind::const_reference const_reference"
       typedef Tag container_category
       typedef
	   allocator_type::difference_type difference_type"
       typedef base_type::iterator iterator
       typedef key_rebind::pointer key_pointer
       typedef
	   allocator_type::template
	   rebind< key_type >::other key_rebind"
       typedef key_rebind::reference key_reference
       typedef
	   allocator_type::template
	   rebind< Key >
	   ::other::value_type key_type"
       typedef mapped_rebind::pointer mapped_pointer
       typedef
	   allocator_type::template
	   rebind< mapped_type >::other mapped_rebind"
       typedef mapped_rebind::reference mapped_reference
       typedef Mapped mapped_type
       typedef Node_Update node_update
       typedef base_type::point_iterator point_iterator
       typedef value_rebind::pointer pointer
       typedef value_rebind::reference reference
       typedef allocator_type::size_type size_type
       typedef
	   allocator_type::template
	   rebind< value_type >::other value_rebind"
       typedef base_type::value_type value_type

Detailed Description
   template<typename Key, typename Mapped, typename Tag, typename Node_Update, typename Policy_Tl, typename Allocator>class
       __gnu_pbds::basic_tree< Key, Mapped, Tag, Node_Update, Policy_Tl, Allocator >
       An abstract basic tree-like (tree, trie) associative container.

       Definition at line 477 of file assoc_container.hpp.

Author
       Generated automatically by Doxygen for libstdc++ from the source code.

libstdc++						       __gnu_pbds::basic_tree< Key, Mapped, Tag, Node_Update, Policy_Tl, Allocator >(3cxx)
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