#!/usr/bin/awk -f
# this awk program calculates load average in every winsize wide window
#   input file format:
#     time0   bytes0
#     time1   bytes1
#     time2   bytes2
#     ...     ...

BEGIN {
        winsize = 0.025;
        nextlimit = winsize;
        bytes = 0;
        allbytes = 0;
}
{
        if ( $1 < nextlimit )
          {
          last = $1;
          bytes += $2;
          }
        else
          {
          print nextlimit "   " bytes*8/winsize/1e8;
          nextlimit += winsize;
          allbytes += bytes;
          bytes = $2;
          }
}
END {
        allbytes+=bytes;
        print last "   " bytes*8/(last-(nextlimit-winsize))/1e8;
        print "# average utilisation was: " allbytes*8/last/1e8;
}