topic H.264 Decoder some threading issues ? in Intel® Integrated Performance Primitives

H.264 Decoder some threading issues ?

detlef_stralaudynami — Tue, 08 May 2012 17:55:06 GMT

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

H.264 Decoder some threading issues ?

Chao_Y_Intel — Wed, 09 May 2012 08:46:01 GMT

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

H.264 Decoder some threading issues ?

detlef_stralaudynami — Wed, 09 May 2012 14:54:55 GMT

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

H.264 Decoder some threading issues ?

Steve_Browne — Thu, 17 May 2012 20:42:39 GMT

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.

H.264 Decoder some threading issues ?

Chao_Y_Intel — Fri, 01 Jun 2012 02:53:21 GMT

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