Date: Mon, 21 Jun 1999 16:08:34 -0400 From: chapin@cs.virginia.edu (Steve Chapin) To: Richard Cownie <tich@ma.ikos.com> Cc: Kedar Rajadnya <kedar@asacomputers.com>, freebsd-smp@freebsd.org Subject: Re: SMP, 4GB RAM, 4x CPU Message-ID: <199906212008.QAA21524@ares.cs.Virginia.EDU> In-Reply-To: Your message of Mon, 21 Jun 1999 12:37:47 EDT. <99062113061000.18239@par28.ma.ikos.com>
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> 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
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