[mythtv] Solving my performance problems...
ijr at po.cwru.edu
Wed Dec 17 20:31:30 EST 2003
On Sunday 14 December 2003 01:33 pm, Steve Brown wrote:
> I hypothesized that part of the problem was the latency of the usleep
> spinlocks in NuppelVideoPlayer. As an experiment, I instrumented all the
> waits and found that only 2 of them were frequently used, specifically,
> the ones at ::GetFrame:614 (appx) and ::OutputVideoLoop:1284 (appx). I
> replaced them with QWaitConditions. Also, ::setPrebuffering is called
> by 2 threads, but doesn't protect the "prebuffering" variable. I didn't
> find any evidence of a race in my testing, but added a lock anyway.
> Hdtv now plays without stuttering whether ota or from disk. The channel
> changing problems remain.
> If you are interested in playing with the patch, let me know off-list. I
> don't want to clutter the list with a half-baked, experimental patch.
Have you done anything more with this?
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