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- Path: sparky!uunet!olivea!sgigate!odin!mips!suneel
- From: suneel@mips.com (Suneel Jain)
- Newsgroups: comp.sys.sgi
- Subject: Re: Indigo R4000 vs. R3000 4D/35
- Message-ID: <1iilrpINN2sr@spim.mti.sgi.com>
- Date: 8 Jan 93 01:36:57 GMT
- References: <1993Jan7.142834.7127@jarvis.csri.toronto.edu> <1993Jan7.213506.6454@Princeton.EDU>
- Organization: Silicon Graphics Computer Systems
- Lines: 26
- NNTP-Posting-Host: limca.mti.sgi.com
-
- In article <1993Jan7.142834.7127@jarvis.csri.toronto.edu>, corkum@csri.toronto.edu (Brent Thomas Corkum) writes:
- > We just installed a R4000 upgrade in an Indigo and after running an in house
- > application that is completely cpu bound I found that it was only 1.8 times
- > faster on the Indigo than on a R3000 4D/35. Now, both have the same amount of
- > memory and the application doesn't use that much. Is this right? Do I need
- > to recompile on the R4000 with some magic compiler option (the code is in
- > kr C)? I'm using the:
- >
- > -cckr -float -O2
- >
- > command line options.
- >
- > Brent
- >
-
- Use the "-mips2" option. This causes the compiler to use the additional
- instructions added to the architecture in the R4000. It also causes
- the compiler to use the R4000 model for scheduling of instructions.
-
- The only drawback of using the -mips2 option is that you can not run
- the resulting binary on a R3000 system.
- --
- Suneel Jain
- EMAIL : suneel@mti.sgi.com PHONE : 1-415-390-4281
- USMAIL: Silicon Graphics Computer Systems, M/S 10U-178,
- 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311
-