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From: j@bonnie.tcd-dresden.de (J Wunsch)
Newsgroups: comp.os.386bsd.questions
Subject: Re: Virtual memory problem, too...
Date: 21 Jul 1993 16:41:31 +0200
Organization: Textil Computer Design GmbH, Dresden, Germany
Lines: 36
Message-ID: <22jkirINNf4g@bonnie.tcd-dresden.de>
References: <C9vHMt.6s9@sidc.com>
NNTP-Posting-Host: bonnie.tcd-dresden.de
In article <C9vHMt.6s9@sidc.com> soo@sidc.com (Vampire Hunter) writes:
>
> I downloaded xphoon from agate.berkeley.edu and tried
>to run the xphoon executable straight out of the tar file.
Maybe, it's compiled with gcc-2.3.3 or higher. It's generating math co
instructions not understood with the stock npx emulator. You'll have
to compile it with gcc-1.39.
>So I attempted to recompile the code, and I got the same out of virtual
>memory error.
Due to some nasty bug in gcc, it's allocating huge amounts of memory
when compiling larger static data arrays (as the moon bitmap in xphoon).
David Dawes told me, linking gcc with GNU malloc would reduce the problem.
On the other hand, i've succesfully compiled it, but it required as much
as 35 MB (!) of virtual memory.
To handle this, unlimiting the datasize ain't sufficient. The hard-limit
(due to the page table size) is 32 MB by default.
To change the defaults, avoid hacking the <machine/vmparam.h>; a better
way were
options "DFLDSIZ='(10*1024*1024)'" # limit datasize 10m
options "MAXDSIZ='(64*1024*1024)'" # limit -h datasize 64m
options "DFLSSIZ='(2*1024*1024)'" # limit stacksize 2m
in your kernel's config file. Be careful with the numbers to avoid
your machine accidentally being constantly paging since some program
attempted to use as much memory as it could get.
I've already mailed this to the FAQ maintainer.
--
in real life: J"org Wunsch | ) o o | primary: joerg_wunsch@tcd-dresden.de
above 1.8 MHz: DL 8 DTL | ) | | private: joerg_wunsch@uriah.sax.de
| . * ) == |
``An elephant is a mouse with an operating system.''