Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!yale!cmcl2!lanl!ttw
From: ttw@lanl.gov (Tony Warnock)
Newsgroups: comp.lang.fortran
Subject: array addressing with pointers
Keywords: overhead
Message-ID: <8086@lanl.gov>
Date: 6 Dec 90 20:44:33 GMT
Organization: Los Alamos Natl Lab, Los Alamos, N.M.
Lines: 16


      In a 1000 by 1000 by 1000 by 1000 by 50 array, would
      someone please post the pointer structure that allows
      access sequentially in each dimension?

      How big is the resulting set of pointers?
      How many memory accesses per element?

      If the 50 is the last dimension accessed, one needs at least
      240240240240000 pointers which is half the number of data
      elements in order to access each of the other dimensions
      in any of the 24 orders. If there is a better orgainzation,
      it would be good if someone would post it.

      The requirements are that each dimension may be accessed
      in the 5-dimensional loop in any order.