Date: Tue, 19 Sep 2000 16:58:24 +0200 From: "Andrei A. Dergatchev" <A.Dergatchev@tn.utwente.nl> To: "Freebsd-Alpha (E-mail)" <freebsd-alpha@FreeBSD.ORG> Subject: Re: alpha ev56 contra ev67 Message-ID: <39C77F10.A89C1C6A@tn.utwente.nl> References: <5ED89301AE60D311AAD500508B0EF55F50E070@dd-mail.intern.dd.dk>
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Hi, In case you haven't heard yet, there is a set of good docs available directly from Compaq :-) http://ftp.digital.com/pub/Digital/info/semiconductor/literature/dsc-library.html > Gentlemen, > > Not directly FreeBSD, but close. > > What are the changes from ev56 to ev67? In short - out of order execution, bigger L1 cache (64K I, 64K D instead of 8K/8K+96K L2). > Specifically, will I see any performance increase from compiling a > program on a ev67, compared to compiling on a ev56 and running the > same program on a ev67. As I heard from someone, if your program is written in hand optimized assembly avoiding stalls and squeezing last cycles from the ev56 using all its features, than you are unlikely to see a big performance boost :-) Otherwise out of order execution and other features of the 264 will likely speed your code up by about factor of 2. By the way why do you expect any change in execution time depending on the platform you're compiling ? > Does anybody, by the way, have any idea of how the gcc compiler fares, > compared > to Compaq's own compiler on the alpha platform ? ccc is better on optimizing for the Alpha, especially when there is something significant to optimize in your code :-) > > TIA, > Bjarne Blichfeldt Rgds, Andrei To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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