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Hi Anurag, </div>
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Where are you computing "m_sTimeDiff"? are you computing it inside the callback? if the data is received, "onData" should be called and I assume you are computing it there? If not, you will not get the right value.</div>
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Additionally, you can also use NDN_LOG. For every log message, it begins with a Unix timestamp which you can use to compute the time difference (this is what I do most of the time). </div>
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Regards,</div>
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Saurab Dulal</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Mini-NDN <mini-ndn-bounces@lists.cs.ucla.edu> on behalf of Lan Wang (lanwang) <lanwang@memphis.edu><br>
<b>Sent:</b> Tuesday, September 8, 2020 11:37 PM<br>
<b>To:</b> Anurag Muttur via Mini-NDN <mini-ndn@lists.cs.ucla.edu><br>
<b>Subject:</b> [Mini-NDN] Problems measuring elapsed time in MiniNDN experiment</font>
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<span class="" style="color:rgba(127,127,127,1.0)"><b class="">From: </b></span><span class="" style="">Andre Dexheimer Carneiro <<a href="mailto:andre.dexheimer@inf.ufrgs.br" class="">andre.dexheimer@inf.ufrgs.br</a>><br class="">
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<span class="" style="color:rgba(127,127,127,1.0)"><b class="">Subject: </b></span><span class="" style=""><b class="">Problems measuring elapsed time in MiniNDN experiment</b><br class="">
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<span class="" style="color:rgba(127,127,127,1.0)"><b class="">Date: </b></span><span class="" style="">September 8, 2020 at 9:41:38 PM CDT<br class="">
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<span class="" style="color:rgba(127,127,127,1.0)"><b class="">To: </b></span><span class="" style=""><a href="mailto:mini-ndn@lists.cs.ucla.edu" class="">mini-ndn@lists.cs.ucla.edu</a><br class="">
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Hi,<br class="">
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<br class="">
I am writing an experiment which instantiates NDN producers and consumers as an attempt to simulate a specific scenario with multiple hosts. However, I can't seem to measure the elapsed time correctly, my code right now is:<br class="">
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dtBegin = std::chrono::steady_clock::now();<br class="">
m_face.expressInterest(interest, bind(&Consumer::onData, this, _1, _2),<br class="">
bind(&Consumer::onNack, this, _1, _2), bind(&Consumer::onTimeout, this, _1));<br class="">
<br class="">
// processEvents will block until the requested data is received or a timeout occurs<br class="">
m_face.processEvents();<br class="">
<br class="">
dtEnd = std::chrono::steady_clock::now();<br class="">
m_sTimeDiff = std::chrono::duration_cast<std::chrono::microseconds>(dtEnd - dtBegin).count();\<br class="">
-----<br class="">
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Everything seems to work fine, with nodes receiving and sending data as they should, however the recorded times are usually at around 1000 us, which is completely unrealistic as the links have between 2ms and 1000ms delay in my topology. Could anybody cast
some light into how to get this metric correctly?<br class="">
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Thanks in advance.<br class="">
<br class="">
André Dexheimer Carneiro<br class="">
Computer Enginnering - UFRGS<br class="">
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