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- Newsgroups: comp.sys.dec,comp.os.vms
- Subject: Re: RePHRASE: alpha memory requirements (vs vax) ?
- Message-ID: <1992Nov6.190011.44@ttisms.com>
- From: dan@ttisms.com
- Date: 6 Nov 92 19:00:11 PDT
- References: <1992Nov5.113540.1@uwovax.uwo.ca> <1992Nov5.130359.1@uwovax.uwo.ca>
- Organization: Touch Technologies Inc., San Diego CA
- Lines: 21
-
- In article <1992Nov5.130359.1@uwovax.uwo.ca>, brent@uwovax.uwo.ca (Brent Sterner) writes:
- > In article <1992Nov5.113540.1@uwovax.uwo.ca>, brent@uwovax.uwo.ca (Brent Sterner) writes:
- >> Just curious about memory demands for alpha. I'm running a VAX 4500
- >> with 128 MB memory. Of that, SHO MEM tells me "38393 pages are permanently
- >> allocated to VMS". How big is VMS on an alpha system? (Perhaps someone with
- >> an alpha could post the last line from SHO MEM, though it might be misleading
- >> if there is a lot of dbugging code still in place. Perhaps someone inside
- >> DEC has a non-debugging system they could use.) Is there a rule of thumb for
- >> typical programs ("alpha memory needs"/"vax memory needs" ~= "constant")?
- >> Does a typical user (VAXC or FORTRAN) program require more or less memory on
- >> an alpha system?
-
- Hi,
-
- Our tests have shown that ALPHA code uses about 3 times the address
- space that VAX code does. This is typical of RISC systems I am
- told...especially when compilers (like the GEM backend used by Digital)
- in-line routines and optimize for systems that issue multiple
- instructions per clock-cycle.
-
- Dan E. (A few months experience on Alpha)
-