#! /bin/sh
#
# This script takes a cpu.dat file and creates a share.dat and an integral.dat
# file from it.  It takes input of the form <filename> <window size>, where
# filename is the location of the cpu.dat file and window size 
# is how many CPU quanta to calculate the share over.

# Parse the inputs, storing the filename and window size

filename="$1"
file=${filename##*/}
name=${file%%-*}

windowSize=$2

# Compute the number of lines in the cpu file

wc=`wc -l $filename`
totalLines=${wc% *}

# Compute the number of processes

numberOfProcs=`head -n 1 "../process/${name}.proc"`

# Create filenames for the share and integral files

newname=${filename%%c*}
sharename=${newname}"share.dat"
integralname=${newname}"integral.dat"

# Clear the share and integral files

echo -n "" > $sharename
#echo -n "" > $integralname

# Traverse each line of the cpu file, calculating each process's share
# and integral at every line

line=1

while [ $line -le $totalLines ]
do

  process=1

  while [ $process -le $numberOfProcs ]
  do

    beginCPU=`awk 'NR=='$((line-windowSize))' {print $'$process'}' $filename`
    endCPU=`awk 'NR=='$line' {print $'$process'}' $filename`

    windowCPU=$((endCPU-beginCPU))

    share=$(echo "scale=6; $windowCPU/$windowSize" | bc)

    echo -n "$share " >> $sharename

    process=$((process+1))

  done

  echo "" >> $sharename

  line=$((line+1))
  
done