[mythtv-users] 32 vs. 64 bit, any significant difference?

[belcampo]

Jack Perveiler wrote:
> On Thu, Dec 17, 2009 at 12:52 PM, Brian Wood <beww at beww.org 
> <mailto:beww at beww.org>> wrote:
> 
>     On Thursday 17 December 2009 10:47:12 am Mike Perkins wrote:
> 
>      >
>      > Also if you're doing a lot of commflagging or transcoding, I
>     would guess
>      >  that extra RAM could make life easier as well.
>      >
>     I wouldn't argue against the fact that Myth "can use" more RAM, but
>     it doesn't
>     "need" it. Certainly I wouldn't go with a 64-bit system solely so
>     Myth could
>     have more than 4GB of RAM, unless you needed it for something else in
>     addition to Myth.
> 
>     I also wonder if more RAM on the graphics card might be more useful
>     than main
>     system RAM, with VDPAU.
>     ____________________________
> 
> 
> Caveat: I'm assuming we're talking about x86 vs x86-64
> 
> People often forget that the x86-64 provides twice as many general 
> purpose registers as 32-bit x86.  They have twice as many SSE registers 
> as well.  Depending on workload, performance can be either worse (due to 
> larger pointers) or better (due primarily to the increase in registers). 
> 
> If I recall, transcoding is one of the poster children for running 
> 64-bit.  I don't have numbers on hand but I definitely noticed an 
> improvement.  I think 15% improvement is the general rule of thumb 
> although I've heard of 30% improvements when transcoding as well.  As 
> with all such things, your mileage will probably vary :)
Never seen any evidence of this, only heard of stories.
> 
> --Jack
> 
> 
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