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<title>Trace Analysis Utilities</title>
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<center><h2>Trace Analysis Utilities</h2></center>
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<p>Here is a collection of trace analysis utilities that
have been useful:
<p>
<ul>
<li><p>Much parsing is easy if you can extract columns. Here is a
helper-perl utility called "<a href="column.htm" tppabs="http://nile.wpi.edu/NS/Example/column">column</a>" that breaks a
text output into columns, separated by whitespace. It is used by many
of the scripts below.</p>
<li><p>Here is a simple perl called <a
href="stats.pl" tppabs="http://nile.wpi.edu/NS/utilities/stats.pl">stats.pl</a> script that prints some stats along the
bottleneck link (node 1 to node 2, in this case) of an output
file <a href="stats.tr" tppabs="http://nile.wpi.edu/NS/utilities/stats.tr">stats.tr</a>. Run it with the command:
<font color=GREEN><code>stats.pl -l1 1 -l2 2 -max 1.5 stats.tr</code></font>.</p>
</li>
<li><p> Here is a tunneled shell command called <a
href="jitter.sh" tppabs="http://nile.wpi.edu/NS/utilities/jitter.sh">jitter.sh</a> combined with <a href="
javascript:if(confirm('http://www.canberra.edu.au/~sam/whp/awk-guide.html \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?'))window.location='http://www.canberra.edu.au/~sam/whp/awk-guide.html'" tppabs="http://www.canberra.edu.au/~sam/whp/awk-guide.html"
target=_top>awk</a>, which calculates CBR traffic jitter at receiver
node (n3) using data in "<font color=RED>out.tr</font>", and stores
the resulting data in "<font color=RED>jitter.txt</font>". This shell
command selects the "CBR packet receive" event at n3, selects time
(column 1) and sequence number (column 10), and calculates the
difference from last packet receive time divided by difference in
sequence number (for loss packets) for each sequence number. </p>
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