[mythtv-users] Front end memory usage
Michael T. Dean
mtdean at thirdcontact.com
Sun Oct 30 17:55:56 EST 2005
Robert Johnston wrote:
>On 30/10/05, Michael T. Dean <mtdean at thirdcontact.com> wrote:
>>Alberto Alonso wrote:
>>>I am finding more info on this. It seems to be mostly
>>>related to theme and resolution. Going down to 640x480
>>>I now get 57M of RES usage, which is a heck of a lot
>>>better, but still rather large if you ask me.
>>>What theme and resolution are you using to the 17M
>>>Also, does anybody know of any setting to set things up
>>>that maybe doesn't cache the whole theme stuff to memory?
>>>It seems that reading from disk on a page change should be
>>I'm using Minimalist-wide (which is appropriate for widescreen TV's).
>>Another Myth box I maintain shows:
>> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
>>32076 root 15 0 69764 26m 18m S 6.3 5.3 752:49.75 mythfrontend
>>And the guy who owns it uses visor--the theme with the clouds (a
>>"complex" background image)--at 1024x768.
>>I really don't think it's the theme's being cached that's causing the
>>problem. The default theme, as distributed (XML descriptions and
>>"unscaled" images), is only 2736KB, Minimalist wide is 2900KB, and visor
>>is 2828KB. On disk, my themecache (the scaled
>>images)--Minimalist-wide.1920.1080--is 7776KB, and visor.1024.768 is
>>5712KB. Also, TTBOMK, Myth doesn't maintain the entire theme in
>>memory. Images are cached on disk as just described. Also, since it
>>notices changes to the XML theme files at runtime, it may not even keep
>>the theme descriptions in memory (although I haven't looked at the
>>source to verify this--it could also be checking modification times or
>>Regardless, I can't see the theme causing it to take 50-100MB of RAM.
>>Maybe for a program like Windows Media Player, but this is MythTV. ;)
>Remember that those theme images are stored (on disk) in a compressed
>form. I believe a QImage is the raw bitmap, uncompressed, in memory.
>So a 1024x768x32-bit image would be 3MiB (25165824 bits)
OK. We've got 2.5MiB out of his 56MiB RES/VIRT unknown at 640x480 to
107MiB RES/171MiB VIRT at some unspecified resolution, so where's the
rest--especially considering there's probably only one full-size image.
Also, as specified earlier in the thread, my 1920x1080 frontend with a
simple theme is only using 16MiB RES/57MiB VIRT--significantly less than
his 640x480 frontend. And, as shown in the message you quoted, the
frontend with the 1024x768 complex theme is using 26MiB RES/68MiB VIRT.
So if the theme is the major problem, both should be using more memory
than he is...
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