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Full Discussion: Performance degradation with KSH93
Top Forums Shell Programming and Scripting Performance degradation with KSH93 Post 302303304 by i.f.schulz on Thursday 2nd of April 2009 10:27:06 AM
Old 04-02-2009
I have two output files. First I get some values from the first file, then I calculate values from the second file that are based on the first one. If you're wondering why I have semicolons at the end of each line, it's because the code is being joined in one string and executed by the "eval" command.

This code takes a couple of seconds for the first calculation and after the 50th it takes more than 1 minute, even though the output files are similar to each other in length.

# Timestamp
u_start=`perl -e 'print time()'`;

# Read values from EnvOPT.dat:? file
if [[ -a EnvOPT.dat:$OFP ]]; then
for x in `grep -e "^Contrail_Length " -e "^Contrail_Climate_Impact " -e "^Contrail_ETS_Cost " -e "^CO2_Emissions " -e "^CO2_Climate_Impact " -e "^CO2_ETS_Cost " EnvOPT.dat:$OFP`; do
param=`echo $x | awk '{print $1}'`;
value=`echo $x | awk '{print $3}'`;

case $param in
Contrail_Length) contrail_length="$value"; ;;
Contrail_Climate_Impact) contrail_climate_impact="$value"; ;;
Contrail_ETS_Cost) contrail_ets_cost="$value"; ;;
CO2_Emissions) co2_emissions="$value"; ;;
CO2_Climate_Impact) co2_climate_impact="$value"; ;;
CO2_ETS_Cost) co2_ets_cost="$value"; ;;
esac;
done;

# Edit both files, keep only important lines
sed '/#OFP_DEP_DEST#/,/ROUTING_TEXT/!d' ProfOPT.dat:$OFP | sed -e '1,12d' -e '$d' > ProfOPT.dat:tmp;
sed '/#Section MetPhenomIndices#/,$!d' EnvOPT.dat:$OFP | sed '1,3d' > EnvOPT.dat:tmp;

# Save edited files in array
set -A u_prof $(< ProfOPT.dat:tmp);
set -A u_env $(< EnvOPT.dat:tmp);

v=0;
# Number of lines (equal in both files)
u=${#u_prof[@]};
fuel_night=0;
while (( $v < $((u-1)) )); do
# Get values from first file (column 3)
 val1=`echo ${u_env[$v]} | awk '{print $3}'`;
val2=`echo ${u_env[$((v+1))]} | awk '{print $3}'`;
# If values at line "i" and "i+1" equals "0" then...
if (( $val1 == 0 && $val2 == 0 )); then
# Get values from second file (column 13)
val1=`echo ${u_prof[$v]} | awk '{print $13}'`;
val2=`echo ${u_prof[$((v+1))]} | awk '{print $13}'`;
# Calculate delta fuel and add to total fuel
fuel_night=$((fuel_night+val2-val1));
fi;
((v+=1));
done;
fi;

u_end=`perl -e 'print time()'`;
echo " Elapsed time: $((u_end-u_start)) seconds";

 

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LEARN ABOUT DEBIAN

actdiag

ACTDIAG(1)						      General Commands Manual							ACTDIAG(1)

NAME

       actdiag - generate activity-diagram image file from spec-text file.

SYNOPSIS

       actdiag [options] files

DESCRIPTION

       This manual page documents briefly the actdiag commands.

       actdiag is a program that generate activity-diagram image file from spec-text file.

OPTIONS

       These  programs	follow	the  usual  GNU  command  line	syntax, with long options starting with two dashes (`-').  A summary of options is
       included below.	For a complete description, see the Info files.

       -h, --help
	      show this help message and exit

       -a, --antialias
	      Pass diagram image to anti-alias filter

       -c FILE, --config=FILE
	      read configurations from FILE

       -o FILE
	      write diagram to FILE

       -f FONT, --font=FONT
	      use FONT to draw diagram

       -s, ----separate
	      Separate diagram images for each group (SVG only)

       -T TYPE
	      Output diagram as TYPE format

SEE ALSO

       The programs are documented fully by
       http://tk0miya.bitbucket.org/actdiag/build/html/index.html

AUTHOR

       actdiag was written by Takeshi Komiya <i.tkomiya@gmail.com>

       This manual page was written by Kouhei Maeda <mkouhei@palmtb.net>, for the Debian project (and may be used by others).

								   June  5, 2011							ACTDIAG(1)
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