Date: Mon, 21 Jun 1999 15:26:23 -0500 (CDT) From: "M. L. Dodson" <bdodson@beowulf.utmb.edu> To: chapin@cs.virginia.edu Cc: Richard Cownie <tich@ma.ikos.com>, Kedar Rajadnya <kedar@asacomputers.com>, freebsd-smp@FreeBSD.ORG Subject: Re: SMP, 4GB RAM, 4x CPU Message-ID: <199906212026.PAA15925@beowulf.utmb.edu> In-Reply-To: <199906212008.QAA21524@ares.cs.Virginia.EDU> References: <99062113061000.18239@par28.ma.ikos.com> <199906212008.QAA21524@ares.cs.Virginia.EDU>
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So tell us: What's the trick compiler suite on Alpha (both fortran and c, preferably)? Bud Dodson Steve Chapin writes: > > > Also there are rumours that Alpha performance is critically > > dependent on the compiler used - i.e. the DEC compiler on Tru64 Unix > > (is that this week's name ?) might give you 30% more performance > > than gcc. This is third-hand information, so may be false (or it > > may be true for Alpha 21164 but not 21264, which I think does more > > dynamic scheduling ?). > > I can confirm this for our case. We run a mixed cluster of Alpha > machines (533 MHz 21664LX) and Intel machines (mostly dual Pentium II > 450MHz), and the use of the "correct" compiler (especially for some of > our <gack> Fortran applications) ais critical to performance on the > Alphas. This isn't too surprising, as a hard-core RISC arch like the > Alpha is going to be much more sensitive to proper code optimization > (or lack thereof) than will the Pentium. > > sc > -- > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-smp" in the body of the message > -- M. L. Dodson bdodson@scms.utmb.edu 409-772-2178 FAX: 409-772-1790 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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