[FFmpeg-devel] Inline ASM vs. Intrinsics
Sun May 13 00:19:51 CEST 2007
On Fri, May 11, 2007 at 02:17:35PM -0700, Trent Piepho wrote:
> The equal cost Itanium2 system was well under half the speed of the
> Opteron system. And that's just capital cost! Supporting ia64 in
> addition to the existing ia32 infrastructure has a cost too.
Yeah, the costs are a big problem for IA64. The high end IA64
processors can cost $thousands just for the chip. I doubt they could
sustain their sales if Opteron was actually possible for the larger
You also get to deal with
- limited availability of tools (many don't get ported)
- limited functionality of tools (oprofile for "sort of" works)
- sensitivity to firmware versions
- the EFI booting process
> The Opteron was quite a bit better in facilities too. You could fit
> a dual CPU system in one rack unit. I don't think Itanium2 would
> pack better than 1 CPU per rack unit.
SGI's 4700 series has apparently managed to cram 20 sockets and 120
DIMM slots into a single 10U box, so with dual-core chips I guess
that's 4x the original density. Having seen the size of an IA64 CPU
that's pretty impressive. Granted, that 10U box is a massive 32.5
inches deep, and if you have more than one of them you presumably need
lots of extra space for the cabling; I see the racks SGI sells for it
are 45 inches deep.
> Power consumption (and thus A/C needs) were also quite a
> bit better for Opteron vs Itanium2.
Lacking a 30-amp dedicated line, we have our relatively small system
(with four 500W power supplies) plugged into a 20A wall outlet. The
cords are, shall we say, "warm" to the touch. It's surprisingly
quiet, though; a single 2U SunFire on the other side of the room can
pretty much drown out 8U of SGI gear a few feet behind you.
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