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Re: Hyperthreaded Decompressor

Alex,

We are finding that our SheerVideo decoders, which use the Base Decompressor, hang when and only when hyperthreading is turned on. Ordinary multithreaded and multiprocessor environments do not exhibit this problem.

Are you using Intel OpenMP (Intel C/C++) code in codec? I saw it is causing QuickTime to crash.

No, we're letting the Base Decompressor do all the MP work.

Does it hang inside your codec or QuickTime?
If it is you probably should use log files to pinpoint where it happens.
Intel VTune could be helpful as well, to pinpoint any race conditions in multithreaded code.

Thanks for the suggestions. We'll check them out.

Andreas

--------------------------------
Andreas Wittenstein
BitJazz Inc.
http://www.bitjazz.com/sheervideo
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References: 
 >Capture images from a sequence grabber in planar format (From: Bing-Chang Lai <email@hidden>)
 >Hyperthreaded Decompressor (From: email@hidden)
 >Re: Hyperthreaded Decompressor (From: Seth Porter <email@hidden>)
 >Re: Hyperthreaded Decompressor (From: email@hidden)
 >Re: Hyperthreaded Decompressor (From: Alex Telitsine <email@hidden>)



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