| Sunday, May 31st, 2015, 00:20 UTC | ||
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| [00:26:01] | markspieth: | jerryr: I get similar startup speedups as dekarl. This is great. |
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| [14:09:06] | markspieth: | looks like recordedseek is not written consecutively. A fresh record does not start fast even when the rest are optimized. |
| [14:10:07] | markspieth: | I even optized with chanid,starttime,mark to make it more optimal but saw no improvement over the one presented previously without mark. |
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| [15:38:31] | dekarl1: | aye, that order is a bit better (might as well do it better while at it) but its not such a big difference |
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| [16:00:03] | dekarl: | That a fresh recording does not start fast / not not start slow comes as a surprise. I'd expect it to not be fragmented and thus start at about the same performance as older recordings. |
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| [19:53:12] | cotterpin: | That seektable defrag made no change here, 8M rows in 46secs. Recordings still start in split second like always.. |
| [19:55:36] | cotterpin: | Have rebuild seektables (en masse) more than once couple years back. |
| [20:43:52] | dekarl: | cotterpin: thanks for testing. Your result is expected. If your database did not have the performance issue to fix in the first place, then there will be no big improvement. Did you optimize mysql settings or put the database on a SSD with good random seek performance? |
| [20:47:17] | cotterpin: | @dekarl yes, SSD & mysql settings suggestions from mythtv mailing list etc. So this slow start is not wide spread problem then ? |
| [20:49:11] | dekarl: | cotterpin: it depends on your usage and setup. I have always some recording that I might watch so the disks are full and automatic deletion makes room just in time. so there are nonstop recordings coming and going leading to heavy fragmentation of the table |
| [20:49:32] | dekarl: | and its on a plain old hard disk, so lots of random seeks kill the performance |
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| [20:58:52] | cotterpin: | @dekarl the SSD is worth it just for compiling & noise. |
| [21:01:03] | cotterpin: | Does anyone build master with Qt5.2 ? |
| [21:01:20] | cotterpin: | I believe Qt5.2 is the Qt5 release in (myth)buntu 14.04. |
| [21:04:55] | cotterpin: | And does mythnews RSS & theme downloader work with Qt5.2 ? |
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| [21:40:55] | jerryr: | dekarl: is there a software solution to this problem recurring with new recordings, or is switching to an SSD system drive the only remedy? |
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| [21:48:09] | cotterpin: | @jerryr I had believed slow recording starts (mpegts) was caused primarily by files not beginning with SPS or SEQuence &/or inadequate probesize &/or probe method of muxer. |
| [21:52:09] | dekarl: | jerryr: yes, and its on "the list". If we switch table over from MyISAM to InnoDB and add a proper primary key, then this fragmentation will be avoided |
| [21:52:55] | dekarl: | but there are other factors that add to slow playback start. -^ |
| [21:54:08] | dekarl: | e.g. large offset between audio/video packets, slow startup of the hardware decode pipeline |
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| [21:54:41] | dekarl: | maybe a spun down recording disk |
| [21:56:01] | dekarl: | So its basically "Identify bottleneck and fix it. Repeat until happy." ;) |
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