Article View: comp.hypercube
Article #41Re: ncube memory
From: Thomas Paul Brisco
Date: Fri, 07 Aug 1987 18:54
Date: Fri, 07 Aug 1987 18:54
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1902 bytes
In article <370@hubcap.UUCP> Lonnie R. Welch (welch-l@osu-eddie.UUCP) writes:
> I am trying to write a
> program that requires the use of several large data structures. It seems
> that the Host process can only have a data segment of size <= 64k. None of
> the variables in my program are larger than 64k, but the sum of the memory
> required by all the variables is > 64k. Has anyone else found this to be a
> problem? How did you get around this limitation?
You don't state whether you acutally need all of the variables
at a given time or not, but one of my tricks is to manually "data
swap" -- i.e. keep data that is not immediately needed on disk, and
malloc()/free() space as necesary to achieve you means.
One other, more crafty but harder, way is to split your
program into 2 processes and do the operations seperately, but
communicating (results) via pipes -- I've found this to be handy when
there are 2 large computations are involved (where both must be on the
host processor), but only the results are really necessary to proceed
in the original process. Look in n_frun, and see whether you really
need the computations locally, or whether they can be moved out of
(what I call) the "controlling process".
Tp.
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!seismo!rochester!rutgers!gatech!hubcap!brisco From: brisco@caip.rutgers.edu (Thomas Paul Brisco) Newsgroups: comp.hypercube Subject: Re: ncube memory Message-ID: <372@hubcap.UUCP> Date: Fri, 7-Aug-87 14:54:17 EDT Article-I.D.: hubcap.372 Posted: Fri Aug 7 14:54:17 1987 Date-Received: Sun, 9-Aug-87 03:45:39 EDT Sender: fpst@hubcap.UUCP Lines: 25 Approved: hypercube@hubcap.clemson.edu