Date: Sun, 08 Nov 2009 12:08:57 +1100 From: Peter Chubb <peterc@gelato.unsw.edu.au> To: Anton Shterenlikht <mexas@bristol.ac.uk> Cc: Michael Dexter <dexter@linuxfund.org>, ia64@freebsd.org Subject: Re: 2009 Update Message-ID: <87hbt5yg9i.wl%peter@chubb.wattle.id.au> In-Reply-To: <20091107232251.GA33482@mech-cluster241.men.bris.ac.uk> References: <595329F2-46F2-4393-B8E3-0923694D250D@mac.com> <20091107214031.GB78634@mech-cluster241.men.bris.ac.uk> <4AF5F413.7010302@osunix.org> <20091107232251.GA33482@mech-cluster241.men.bris.ac.uk>
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>>>>> "Anton" =3D=3D Anton Shterenlikht <mexas@bristol.ac.uk> writes: Anton> On Sat, Nov 07, 2009 at 05:26:27PM -0500, "C. Bergstr=F6m" wrote: Anton> There are 6 ia64 systems on top500 list (details below). All Anton> run linux, of course. But these organisations must use very Anton> good compilers, and, at least for nuclear codes (systems 71 and Anton> 96), these will be f90-f95 or even f2003 (I don't know of any Anton> f2008) compilers. Perhaps they do use PathScale and forget Anton> about GCC.. Most use the Intel compiler, and heavy hand-optimization of inner loops using tools like vTune. Gelato put a lot of effort into imprving gcc for IA64 -- gcc 4.x is miles better than gcc 3.x -- but there's still a lot that could be done with low-level instruction scheduling. Peter C -- Dr Peter Chubb www.nicta.com.au peter DOT chubb AT nicta.com.au http://www.ertos.nicta.com.au ERTOS within National ICT Australia
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