[mythtv-users] 32 vs. 64 bit, any significant difference?
belcampo
belcampo at zonnet.nl
Thu Dec 17 19:29:57 UTC 2009
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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>
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