H.264 Decoder some threading issues ?

[detlef_stralaudynami]

I don't know why, but if you initialize to decoder with ((Number of Cores of Die) >>1), or 1,it will work acceptible, otherwise if you choose auto mode (0) it will freeze the hole system.
I set the PREPROCESSOR to "_OPENMP" and working with IPP 7.0.7 and UMC 7.0.7.
I think there are someproblems in general design depending on Threading.

Best Regards

Detlef

[Chao_Y_Intel]

Hello

For the decoder "will freeze the hole system". Does it mean the decoder has a deadlock, or the decode use all of the CPUs? The later one is fine, since the decoder has same numbers with CPU cores.

Thanks,
Chao

[detlef_stralaudynami]

Hi,
no dead-lock happens.

My development pc has an Intel quad core.
if i use 2 threads the cpu usage is 30 %
if i use 4 threads the cpu usage is growing up to 90% and all cores are used.

i can't beleave that there is about 60 % more CPU usage forusing 2threads more. What happens there ?

Best regards

Detlef

[Steve_Browne]

This sounds like the issue I reported in the following thread:

http://software.intel.com/en-us/forums/showthread.php?t=104578

No solution so far though. I'm glad I'm not the only one that's noticed this.

[Chao_Y_Intel]

Hello,

Thanks Steve for sharing the workaround. For those who are looking at this problem, here is the fix:
http://software.intel.com/en-us/forums/showthread.php?t=105363

Thanks,
Chao