Date: Fri, 3 Sep 1999 07:04:41 -0400 From: "Gary McKinney" <gmckinney@megabits.net> To: <obrien@NUXI.com>, <alpha@FreeBSD.ORG> Subject: Re: relative alpha speed Message-ID: <00ee01bef5fc$203599e0$1e00000a@gary2.megabits.net>
next in thread | raw e-mail | index | archive | help
There is also a thread in the Debian Linux group about performance of the floating point lib routines (the lib routines are patterned after the Intel FP unit and the Alpha is a different creature with different needs). Compaq has a download area for the fp libs that run under Linux and I have heard (not first hand knowledge) that it makes a BIG difference in performance (ref to Linux here as they are using the egcs compiler as well)... You also have to structure the order of operations to take advantage of the pipeline architecture to optimize for the inherit latencies the different fp operation have as opposed to the way the Intel fp unit operates... The Compaq compiler deals with it very well as the lib routines are tuned to the way the Alpha FP Unit and pipeline works... The link to the libs at Compaq (free) is: http://www.unix.digital.com/linux/cpml/index.html If I had the time I would look further into this but I'm totally overloaded as it is (don't ask - work at a financial institution and in the process of a merger, two new branches, installing a new host system [HP9000 K370] and upgrading all the workstations [85] and need to be complete by Oct 1 <whew>).... Maybe someone could try out the Alpha fp libs and see if it makes a difference <grin>... gm.. -----Original Message----- From: David O'Brien <obrien@NUXI.com> To: alpha@FreeBSD.ORG <alpha@FreeBSD.ORG> Date: Friday, September 03, 1999 4:57 AM Subject: Re: relative alpha speed >> > I think the problem may be with our compiler. I don't think the penalty >> > for using -mieee ought to be so high. I wonder how well the Compaq >> > compiler deals with this. > >There is a long thread about -mieee in the EGCS lists. Extracted thread >at ftp://relay.nuxi.com/obrien/mieee.mbox. > >-- >-- David (obrien@NUXI.com) > > >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-alpha" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?00ee01bef5fc$203599e0$1e00000a>