[mythtv] Choppy performance on Mac Intel builds / scaling issue?

[usleepless at gmail.com]

Hello James,

pardon my curiosity: do you know where the "ml_set_interrupts_enabled"
are coming from?

regards,

usleep

On 3/26/06, James Mitchell <mitchell at bruteforce.org> wrote:
> In contrast to some other reports of good 1080i performance
> via the MMX enabled builds of 0.19, I'm experiencing issues
> with both 1080i content, and scaled 480i content.
>
> I'm getting very choppy performance on a 1.66GHz core duo
> with the MMX enabled binaries linked from:
>
> http://www.mythtv.org/wiki/index.php/Myth_on_Mac_x86
>
> This applies to both 1080i content, and scaled 480i content,
> which I found pretty strange. For comparison, the latest
> trunk builds of VLC play these same files perfectly over
> the network, so the machine is clearly capable.
> Interestingly, if I turn off 'Scale Video as Necessary' in
> TV Settings->Playback, then the problem goes away, at least
> for the 480i content. There is a corresponding impact to
> the profile information that Shark reports. The difference
> appears to be the YUV422_UC_ToRGB32BitColorBGRA
> QuickTimeComponents function, which is the primary consumer
> of cycles in everything except the '480i, do not scale
> video' case. Checking/unchecking the scale video setting
> has no effect on the performance of 1080i playback.
>
> The function in question is called out of libmythtv
> VideoOutputQuartzView::Show(), and appears to be seperate
> from the non-optimized yuv420-2vuy colorspace conversion
> within the libmythtv code that some have mentioned.
>
> Is anyone else seeing this effect? Any ideas on what might
> be done to address it?
>
> I've included some of the Shark output from different test
> scenarios:
>
> Shark Time Profile of Mythfrontend Intel MMX build playing
> 1080i content at 1920x1080 on core duo 1.66GHz mac mini
>
> 26.5%	26.5%	QuickTimeComponents YUV422_UC_ToRGB32BitColorBGRA
> 18.7%	18.7%	mythtv	non_vec_yuv420_2vuy(unsigned
> 		char*, unsigned char*, unsigned char*, unsigned char*,
> 		int, int, int, int, int)
> 8.8%	8.8%	mythavcodec mpeg_decode_mb	
> 5.3%	5.3%	mythavcodec ff_simple_idct_add_mmx
> 3.8%	3.8%	mach_kernel ml_set_interrupts_enabled
> 3.4%	3.4%    mythavcodec put_pixels16_xy2_mmx
> 3.3%	3.3%    mythavcodec put_pixels16_mmx	
> 2.9%    2.9%    mythavcodec MPV_decode_mb	
> 2.9%    2.9%    mythavcodec put_pixels8_mmx	
> 1.9%    1.9%    mythavcodec ff_simple_idct_put_mmx
> 										Shark Time Profile of Mythfrontend Intel MMX build playing
> 480i content at 1920x1080 (With TV Settings->Scale Video
> as Necessary checked) on core duo 1.66GHz mac mini
>
> 11.9%	11.9%   mach_kernel ml_set_interrupts_enabled
> 5.4%    5.4%    mythtv non_vec_yuv420_2vuy(unsigned
>                 char*, unsigned char*, unsigned char*,
> 		unsigned char*, int, int, int, int, int)
> 3.2%    3.2%    mythavcodec mpeg_decode_mb	
> 2.5%    2.5%    mythavcodec ff_mpa_synth_filter	
> 2.1%    2.1%    mythavcodec ff_simple_idct_add_mmx
> 1.3%    1.3%    mythavcodec put_pixels8_mmx	
> 1.0%    1.0%    AudioToolbox Resampler2::ConvertAltivec(float*,
>                 float*, unsigned long, int)
> 1.0%    1.0%    mythavcodec put_pixels16_mmx	
> 0.9%    0.9%    mythavcodec MPV_decode_mb	
> 0.7%    0.7%    mythtv AvFormatDecoder::MpegPreProcessPkt(AVStream*,
>                 AVPacket*)
> 0.6%    0.6%    mythavcodec put_pixels16_xy2_mmx
> 0.5%    0.5%    mythavcodec MPV_motion	
>
> Shark Time Profile of Mythfrontend Intel MMX build playing
> 480i content at 1920x1080 (With TV Settings->Scale Video
> as Necessary unchecked) on core duo 1.66GHz mac mini
>
> 23.9%   23.9%   mach_kernel ml_set_interrupts_enabled
> 9.5%    9.5%    mythtv non_vec_yuv420_2vuy(unsigned char*,
>                 unsigned char*, unsigned char*,
> 		unsigned char*, int, int, int, int, int)
> 7.8%    7.8%    commpage [libSystem.B.dylib] __memcpy
> 6.9%    6.9%    mythavcodec mpeg_decode_mb	
> 5.9%    5.9%    mythavcodec ff_mpa_synth_filter	
> 4.8%    4.8%    mythavcodec ff_simple_idct_add_mmx
> 3.2%    3.2%    AudioToolbox Resampler2::ConvertAltivec(float*,
>                 float*, unsigned long, int)
> 2.1%    2.1%    mythavcodec put_pixels8_mmx	
> 1.8%    1.8%    mythavcodec put_pixels16_mmx	
> 1.8%    1.8%    mythavcodec MPV_decode_mb	
>
> Here's the call tree for how mythtv reaches the expensive
> Quicktime function:
>
> 27.2%  QuickTimeComponents YUV422_UC_ToRGB32BitColorBGRA
> 0.0%   QuickTimeComponents FinalGlueBeforeTheBlit
> 0.0%   QuickTimeComponents PrepareForBlitThenDoBlit
> 0.0%   QuickTimeComponents ScalingCodecComponentDispatch
> 0.0%   CarbonCore CallComponentDispatch
> 0.0%   QuickTimeComponents ImageCodecDrawBand
> 0.0%   QuickTimeComponents BaseCodec_DecompressWorkFunction
> 0.0%   CarbonCore InvokeComponentMPWorkFunctionUPP
> 0.0%   QuickTimeComponents BaseCodec_DecompressCallBack_Common
> 0.0%   QuickTimeComponents Base_CDBandDecompress
> 0.0%   CarbonCore CallComponentFunctionCommon
> 0.0%   QuickTimeComponents Base_CDComponentDispatch
> 0.0%   QuickTimeComponents ScalingCodecComponentDispatch
> 0.0%   QuickTimeComponents YUV422CodecComponentDispatch
> 0.0%   CarbonCore CallComponentDispatch
> 0.0%   QuickTime ImageCodecBandDecompress
> 0.0%   QuickTime DoBandedDecompress
> 0.0%   QuickTime ICMAction	
> 0.0%   QuickTime ICMDeviceLoop	
> 0.0%   QuickTime DecompressSequenceFrameWhen
> 0.0%   mythtv VideoOutputQuartzView::Show()
>
> Thanks,
>
> James
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