Re: Linux and Intel's Hyperthreading
On Sat, 2003-01-04 at 21:13, Rob Weir wrote:
> On Thu, Jan 02, 2003 at 07:35:41PM +0100, mess-mate wrote:
> > On Tue, 31 Dec 2002 20:16:03 -0800 (PST)
> > "nate" <debian-user@aphroland.org> wrote:
> >
> > | nick lidakis said:
[snip]
> > Well, ASUS suggest to compile with the Hyper-Threading compiler ???
> > What about this compiler ?
>
> I'd say they mean Intel's non-Free C/C++ compiler. It costs a bucket in
> general, but I think it's free (as in beer) for personal use. Of
> course, the C++ compiler's ABI is incompatible with every GCC release
> thus far (not that GCC is even compatible with itself, across releases),
> so you'll have a hell of a time getting it to integrate int your Debian
> system, if you decide to use it. Depending on what you do, it can
> apparently lead to enormous speedups (mostly with numerical code
> though, or so I hear), but GCC 3.x is closing the gap...
>
> Anyhow, I can't imagine that a smart compiler could do *that* much to
> help, since getting good performance on multi-processor systems is more
> of a programming design issue, rather than compiler smarts. No doubt
> having two 'CPU's in the once chip, sharing registers and cache requires
> some compiler intelligence though.
You'd be amazed at how good those ex-DEC compiler writers are...
http://www.coyotegulch.com/reviews/almabench.html
In this heavily numerical benchmark, the best Intel Fortran and C++
timings are 3.24x faster than the best g++ 3.2.1 timings.
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