[mythtv-users] Poor playback performance on Mac mini

Joe Nyland joenyland at me.com
Tue Mar 13 08:51:33 UTC 2012

On 13 Mar, 2012,at 07:54 AM, Simon Hobson <linux at thehobsons.co.uk> wrote:

> Joe Nyland wrote:
> >>On the contrary. It means you are using one full core of that
> >>2.4GHz Core 2 Duo, and hitting a wall because something is single
> >>threaded.
> >>
> >
> >Well, I say 50% - what the activity monitor of Mac OS shows is that
> >both cores are running at around 50%.
> Can be much the same thing. The (single thread) task may well get
> switched between cores, so while it's limited to 100% of one core, it
> isn't the same core all the time and once averaged a bit (for display
> purposes) it appears as 50% each on two cores.
> If you run "top", what process/program is using the CPU ? That might
> help someone with deep knowledge of the code to coment.
> >>>RAM usage hovers around 2GB mark on my primary frontend.
> >>>
> >>
> >>Well that simply doesn't sound right. Even at 1080p and an artwork
> >>intensive theme, you shouldn't be hitting half that. Are you
> >>reading the resource usage, or the virtual memory allocation?
> >>
> >
> >I've checked my RAM figures and again to get it right:
> >
> >RAM usage for MythFrontend on my iMac is 205Mb.
> >RAM usage for MythFrontend on my Mac mini is around 240Mb.
> >
> >
> >Please disregard my 2GB RAM figure from before.
> It's easy to get that wrong. Like most modern OSs, Linux will use any
> spare RAM for disk cache - so once you do a bit of I/O then you are
> almost guaranteed to see all RAM "in use". If you cat /proc/meminfo
> it gives a breakdown of what's been used for what.
> -- 
> Simon Hobson
> Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
> author Gladys Hobson. Novels - poetry - short stories - ideal as
> Christmas stocking fillers. Some available as e-books.
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Thank you for your email Simon.

I'll try and post that info you have highlighted to the list when I get home tonight.

Anyone get any thoughts on why I would be seeing such behaviour with only 1920x1080 on my iMac too? - Again, other (higher and lower) resolutions are ok on my iMac.


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