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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue">Let me know how you get on with the tuning.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue">It’s one of those things which I feel could make little to no improvement until things like this crop up.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue">I’ve no idea how you would measure the MySQL / MariaDB performance before and after tuning to know whether it’s made any differences – but if it prevents startup
delays, then that’ll probably be the best measure </span><span style="font-size:10.0pt;font-family:Wingdings;color:blue">J</span><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue">One other thought – after reading another thread about failed drives… you’re not suffering from a pre-failure drive problem are you? Perhaps check the SMART data
too…<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> mythtv-users-bounces@mythtv.org [mailto:mythtv-users-bounces@mythtv.org]
<b>On Behalf Of </b>Tom Wheeler<br>
<b>Sent:</b> 06 October 2014 15:03<br>
<b>To:</b> Discussion about MythTV<br>
<b>Subject:</b> Re: [mythtv-users] How to Prevent Freeze When Starting Playback<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I'm running 0.27, and all of my storage is locally mounted SATA disks on the backend. No NFS or even external USB disks.
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I do have a fair number of programs recorded, but in the hundreds rather than thousands. I wouldn't think that would be enough to stress MySQL at all, but I haven't looked at the database tuning parameters.
I'm pretty experienced with MySQL, so I will check those tonight.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I also haven't seen anything definitive in the logs, though since it's an intermittent problem, it's kind of hard to correlate the timestamps with when the problem occurs. I'll take a laptop with me when I watch
TV tonight so I can ssh into the backend and frontend and look at the logs in real time while starting playback.<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal">On Mon, Oct 6, 2014 at 6:34 AM, Tremayne, Steve <<a href="mailto:steven.tremayne@honeywell.com" target="_blank">steven.tremayne@honeywell.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue">Do you have a lot of recorded shows in your list – or just a few?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue">It could be an issue with your database – for example, if there are a lot of recorded programs then
when you start a show, Myth & the database need to work out which actual file your computer is actually going to start playing.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue">I am in the process of setting up a new Myth box and saw this recently:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue"><a href="http://www.mythtv.org/wiki/Tune_MySQL" target="_blank">http://www.mythtv.org/wiki/Tune_MySQL</a></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue">Just a thought…</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue">Cheers,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue"><br>
Steve</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a href="mailto:mythtv-users-bounces@mythtv.org" target="_blank">mythtv-users-bounces@mythtv.org</a> [mailto:<a href="mailto:mythtv-users-bounces@mythtv.org" target="_blank">mythtv-users-bounces@mythtv.org</a>]
<b>On Behalf Of </b>Tom Wheeler<br>
<b>Sent:</b> 03 October 2014 23:27<br>
<b>To:</b> Discussion about MythTV<br>
<b>Subject:</b> [mythtv-users] How to Prevent Freeze When Starting Playback</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">I have a combined backend/frontend and now an additional (separate) frontend, both running 0.27 on Mythbuntu. I have noticed with increasing frequency on both systems over the past several
weeks that MythTV temporarily hangs when I start playing back a previously recorded show.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">To be a bit more specific, when I select the show I want to watch and click OK on my remote, playback often does not begin for a few seconds, and sometimes for as much as 45 seconds.
I'd estimate that the frequency of the delay follows this pattern:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> 40% - No noticeable delay at all<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> 30% - Delay of 3 seconds or less<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> 15% - Delay of 3-5 seconds<br>
10% - Delay of 5-10 seconds<br>
5% - Delay of 10 seconds or more<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">What I mean by "freeze" is that it continues showing the list of programs from which I selected (the video hasn't started playing yet) and the frontend no longer responds to input from
the remote. In the extreme cases where it freezes for 20+ seconds, I start to doubt whether I'd actually hit OK in the first place, so I hit it again. Nothing happens, of course, until the program eventually starts playing and the system processes both clicks.<br>
<br>
Any idea what causes this delay and how I can eliminate it?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks,<br>
<br>
Tom<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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