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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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LEARN ABOUT CENTOS

__gnu_pbds::tree

__gnu_pbds::tree< Key, Mapped, Cmp_Fn, Tag, Node_Update, _AllLibrary Functions__gnu_pbds::tree< Key, Mapped, Cmp_Fn, Tag, Node_Update, _Alloc >(3)

NAME

       __gnu_pbds::tree< Key, Mapped, Cmp_Fn, Tag, Node_Update, _Alloc > -

SYNOPSIS

       Inherits __gnu_pbds::basic_branch< Key, Mapped, Tag, detail::tree_traits< Key, Mapped, Cmp_Fn, Node_Update, Tag, _Alloc >::node_update,
       __gnu_cxx::typelist::create2< Cmp_Fn, detail::tree_traits< Key, Mapped, Cmp_Fn, Node_Update, Tag, _Alloc > >::type, _Alloc >.

   Public Types
       typedef Cmp_Fn cmp_fn
       typedef detail::tree_traits
	   < Key, Mapped, Cmp_Fn,
	   Node_Update, Tag, _Alloc >
	   ::node_update node_update"

   Public Member Functions
       tree (const cmp_fn &c)
       template<typename It > tree (It first, It last)
       template<typename It > tree (It first, It last, const cmp_fn &c)
       tree (const tree &other)
       tree & operator= (const tree &other)
       void swap (tree &other)

Detailed Description
   template<typename Key, typename Mapped, typename Cmp_Fn = std::less<Key>, typename Tag = rb_tree_tag, template< typename Node_CItr, typename
       Node_Itr, typename Cmp_Fn_, typename _Alloc_ > class Node_Update = null_node_update, typename _Alloc = std::allocator<char>>class
       __gnu_pbds::tree< Key, Mapped, Cmp_Fn, Tag, Node_Update, _Alloc >
       A tree-based container.

       Template Parameters:
	   Key Key type.
	   Mapped Map type.
	   Cmp_Fn Comparison functor.
	   Tag Instantiating data structure type, see container_tag.
	   Node_Update Updates tree internal-nodes, restores invariants when invalidated. XXX See design::tree-based-containersnode invariants.
	   _Alloc Allocator type.

       Base tag choices are: ov_tree_tag, rb_tree_tag, splay_tree_tag.

       Base is basic_branch.

       Definition at line 635 of file assoc_container.hpp.

Member Typedef Documentation
   template<typename Key , typename Mapped , typename Cmp_Fn  = std::less<Key>, typename Tag  = rb_tree_tag, template< typename Node_CItr,
       typename Node_Itr, typename Cmp_Fn_, typename _Alloc_ > class Node_Update = null_node_update, typename _Alloc  = std::allocator<char>>
       typedef Cmp_Fn __gnu_pbds::tree< Key, Mapped, Cmp_Fn, Tag, Node_Update, _Alloc >::cmp_fn
       Comparison functor type.

       Definition at line 642 of file assoc_container.hpp.

Constructor &; Destructor Documentation
   template<typename Key , typename Mapped , typename Cmp_Fn  = std::less<Key>, typename Tag  = rb_tree_tag, template< typename Node_CItr,
       typename Node_Itr, typename Cmp_Fn_, typename _Alloc_ > class Node_Update = null_node_update, typename _Alloc  = std::allocator<char>>
       __gnu_pbds::tree< Key, Mapped, Cmp_Fn, Tag, Node_Update, _Alloc >::tree (const cmp_fn &c) [inline]
       Constructor taking some policy objects. r_cmp_fn will be copied by the Cmp_Fn object of the container object.

       Definition at line 648 of file assoc_container.hpp.

   template<typename Key , typename Mapped , typename Cmp_Fn  = std::less<Key>, typename Tag  = rb_tree_tag, template< typename Node_CItr,
       typename Node_Itr, typename Cmp_Fn_, typename _Alloc_ > class Node_Update = null_node_update, typename _Alloc  = std::allocator<char>>
       template<typename It > __gnu_pbds::tree< Key, Mapped, Cmp_Fn, Tag, Node_Update, _Alloc >::tree (Itfirst, Itlast) [inline]
       Constructor taking __iterators to a range of value_types. The value_types between first_it and last_it will be inserted into the container
       object.

       Definition at line 655 of file assoc_container.hpp.

   template<typename Key , typename Mapped , typename Cmp_Fn  = std::less<Key>, typename Tag  = rb_tree_tag, template< typename Node_CItr,
       typename Node_Itr, typename Cmp_Fn_, typename _Alloc_ > class Node_Update = null_node_update, typename _Alloc  = std::allocator<char>>
       template<typename It > __gnu_pbds::tree< Key, Mapped, Cmp_Fn, Tag, Node_Update, _Alloc >::tree (Itfirst, Itlast, const cmp_fn &c) [inline]
       Constructor taking __iterators to a range of value_types and some policy objects The value_types between first_it and last_it will be
       inserted into the container object. r_cmp_fn will be copied by the cmp_fn object of the container object.

       Definition at line 663 of file assoc_container.hpp.

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

libstdc++							  Tue Jun 10 2__gnu_pbds::tree< Key, Mapped, Cmp_Fn, Tag, Node_Update, _Alloc >(3)
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