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<div id="yiv2230296969yui_3_16_0_1_1426141957505_33525">Hello Ross,</div>
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<div id="yui_3_16_0_1_1426141957505_42310" dir="ltr">Hope that you're doing fine.</div>
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<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_33222">I digged a bit deeper into the problem and ran gprof to do profiling on the application.</div>
<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_33527">Below are the results.<br clear="none">
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<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_33247"> 59.62 0.62 0.62 9593542 64.63 106.32 BasicTaskScheduler::SingleStep(unsigned int)<br class="yiv2230296969" style="" clear="none">
15.39 0.78 0.16 19190028 8.34 10.42 DelayQueue::synchronize()<br class="yiv2230296969" style="" clear="none">
5.77 0.84 0.06 57557157 1.04 1.04 HandlerIterator::next()<br class="yiv2230296969" style="" clear="none">
4.81 0.89 0.05 9593542 5.21 5.21 HandlerIterator::HandlerIterator(HandlerSet&)<br class="yiv2230296969" style="" clear="none">
3.85 0.93 0.04 19190029 2.08 2.08 TimeNow()<br class="yiv2230296969" style="" clear="none">
2.88 0.96 0.03 9593542 3.13 13.55 DelayQueue::handleAlarm()<br class="yiv2230296969" style="" clear="none">
2.88 0.99 0.03 9592398 3.13 3.13 BasicUDPSource::incomingPacketHandler1()<br class="yiv2230296969" style="" clear="none">
1.92 1.01 0.02 9593542 2.08 12.51 DelayQueue::timeToNextAlarm()<br class="yiv2230296969" style="" clear="none">
0.96 1.02 0.01 9592402 1.04 1.04 HandlerIterator::reset()<br class="yiv2230296969" style="" clear="none">
0.96 1.03 0.01 DelayQueue::findEntryByToken(long)<br class="yiv2230296969" style="" clear="none">
0.96 1.04 0.01 HandlerSet::lookupHandler(int)<br class="yiv2230296969" style="" clear="none">
0.00 1.04 0.00 9593541 0.00 0.00 HandlerIterator::~HandlerIterator()<br class="yiv2230296969" style="" clear="none">
0.00 1.04 0.00 9592398 0.00 0.00 BasicUDPSource::incomingPacketHandler(BasicUDPSource*, int)<br class="yiv2230296969" style="" clear="none">
0.00 1.04 0.00 3094 0.00 0.00 DelayQueue::removeEntry(DelayQueueEntry*)<br class="yiv2230296969" style="" clear="none">
0.00 1.04 0.00 3093 0.00 10.42 DelayQueue::addEntry(DelayQueueEntry*)<br class="yiv2230296969" style="" clear="none">
0.00 1.04 0.00 3093 0.00 0.00 DelayQueueEntry::DelayQueueEntry(DelayInterval)<br class="yiv2230296969" style="" clear="none">
0.00 1.04 0.00 3092 0.00 10.43 BasicTaskScheduler0::scheduleDelayedTask(long, void (*)(void*), void*)<br class="yiv2230296969" style="" clear="none">
0.00 1.04 0.00 3088 0.00 0.00 AlarmHandler::~AlarmHandler()<br class="yiv2230296969" style="" clear="none">
0.00 1.04 0.00 3088 0.00 0.00 DelayQueueEntry::~DelayQueueEntry()<br class="yiv2230296969" style="" clear="none">
0.00 1.04 0.00 3082 0.00 10.28 AlarmHandler::handleTimeout()<br class="yiv2230296969" style="" clear="none">
0.00 1.04 0.00 3081 0.00 0.00 DelayQueueEntry::handleTimeout()<br class="yiv2230296969" style="" clear="none">
0.00 1.04 0.00 2988 0.00 0.00 BasicTaskScheduler::schedulerTickTask(void*)</div>
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<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_33528">What's happening is that the BasicUDPSource::incomingPacketHandler1() function is being called too many times.</div>
<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_33809">I added a counter in the function and it seems that this line of code is being called many many times (line 65 in BasicUDPSource.cpp):<br clear="none">
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<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_34657">if (!isCurrentlyAwaitingData()) return;<br clear="none">
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<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_31943">I modified the line to:</div>
<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_35234">if (!isCurrentlyAwaitingData()) {usleep(500);return;}<br clear="none">
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<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_34946">And since then the CPU usage does not go up to 100% but stays around 1%! :)<br clear="none">
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<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_35814">I don't know if it's a correct thing to do and what its implications could be.</div>
<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_36685">When I'm running the stream, the audio is a bit choppy but I'm not sure that's related to this modification or my bandwidth. (I'll do some further tests to confirm this)<br clear="none">
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<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_36687">Do you have any idea why this line would be called so many times and maybe a better solution?<br clear="none">
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<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_37280">I double checked the ffmpeg command and everything seems normal.<br clear="none">
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<div dir="ltr" id="yiv2230296969yui_3_16_0_1_1426141957505_36689">Thanks!</div>
Shaan
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<div style="direction: ltr;" id="divRpF180457"><font face="Tahoma" color="#000000" size="2"><b>From:</b> live-devel [live-devel-bounces@ns.live555.com] on behalf of Ross Finlayson [finlayson@live555.com]<br>
<b>Sent:</b> Wednesday, March 11, 2015 3:25 AM<br>
<b>To:</b> LIVE555 Streaming Media - development & use<br>
<b>Subject:</b> Re: [Live-devel] 100% cpu usage when 1 or more client connects to RTSP server<br>
</font><br>
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<p dir="ltr" class="">1. Actually it seems that reuseFirstSource variable is not used in the original testOnDemandRTSP for the UDP mpegts example(and in my code too).</p>
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<div>Yes, you’re correct. The “MPEG2TransportUDPServerMediaSubsession” implementation sets the “reuseFirstSource” parameter to True when it calls the parent ("OnDemandServerMediSubsession”) constructor, so - in this particular case - the “reuseFirstSource”
variable in the “testOnDemandRTSPServer” code isn’t used (and therefore isn’t relevant to you, if all you are doing is streaming from UDP input sources). My mistake.</div>
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<div class=""><span class="Apple-style-span" style="border-collapse:separate; color:rgb(0,0,0); font-family:Helvetica; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px"><span class="Apple-style-span" style="border-collapse:separate; color:rgb(0,0,0); font-family:Helvetica; font-style:normal; font-variant:normal; font-weight:normal; letter-spacing:normal; line-height:normal; orphans:2; text-indent:0px; text-transform:none; white-space:normal; widows:2; word-spacing:0px">Ross
Finlayson<br class="">
Live Networks, Inc.<br class="">
<a href="http://www.live555.com/" class="" target="_blank">http://www.live555.com/</a></span></span>
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