[mythtv-users] mythbackend CPU spikes in "watch recordings"?

Niklas Brunlid prefect47 at gmail.com
Tue Dec 29 02:11:24 UTC 2009

Doh! Too quick on the "send" button.

"nVidia nnnn" should be Sparkle GeForce 9400 GT PCI card, with OpenGL
painter and VDPAU output. :)

/ Niklas

2009/12/28 Niklas Brunlid <prefect47 at gmail.com>

> Hi,
> First of all, a big thanks to all developers and testers. I've used mythtv
> since around 2003 and my VCR has been collecting dust ever since. My
> harddrive expenses have gone up a bit though... =)
> I run Fedora 11 on an Asus K8V with an AMD64 3000+ and an nVidia nnnn,
> using DVI->HDMI to a FullHD LCD TV and the SP/DIF of the mainboard directly
> to the amplifier. The system is somewhat regularly updated against the
> Fedora and ATrpms repos. MythTV version is release-0-22-fixes 22973.
> Everything runs on the same computer.
> My problem is that the UI is extremely slow, like when I step around in the
> "watch recordings" screen. It seems that mythbackend responds VERY slowly -
> if I queue up 10-20 key presses up or down and switch to a console window,
> "top" tells me that mythbackend is using a lot of CPU (at least 80-90%) when
> these keypresses are handles by the frontend. It's only mythbackend and not
> the mythfrontend or mysql processes though. It feels like each step up or
> down takes seconds.
> The effect is the same in the Terra, MythBuntu and blue-abstract themes.
> I've read that constant regeneration of snapshot images could slow down the
> system, but this happens in both panes of "watch recordings" and in the left
> one no snapshots are shown. All my recording and mythvideo drives are
> noatime/nodiratime but not my system drive:
> /etc/fstab extract:
> LABEL=myth1tb-disk1  /myth/bigdisk1 ext3
> noatime,nodiratime,data=writeback  1 2
> LABEL=myth1tb-disk2  /myth/bigdisk2 ext3
> noatime,nodiratime,data=writeback  1 2
> LABEL=myth1tb-disk3  /myth/bigdisk3 ext3
> noatime,nodiratime,data=writeback  1 2
> LABEL=myth1tb-disk4  /myth/bigdisk4 ext3
> noatime,nodiratime,data=writeback  1 2
> / Niklas
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