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From: barbems@netcom.com (Barbara Snyder)
Subject: Re: Resource Limits
Message-ID: <barbemsDoEDs5.Aw9@netcom.com>
Organization: NETCOM On-line Communication Services (408 261-4700 guest)
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References: <4hmagl$mqf@gwdu19.gwdg.de>
Date: Sun, 17 Mar 1996 05:55:17 GMT
Lines: 27
Sender: barbems@netcom13.netcom.com
Konrad Heuer (kheuer@gwdg.de) wrote:
> With FreeBSD Release 2.1:
>
> After explicitly resetting the soft resource limits in
> /etc/profile and /etc/csh.login I observe that my test
> program gets only half of the memory defined by the data limit.
>
> The limits I use are (csh formulation):
>
> limit datasize 8192 kbytes
/* program that malloc's 1 meg, free's, 2 meg, free's, 3 meg, free's, etc */
2.1-RELEASE's malloc() is tuned for speed, not space optimization. It
always allocates memory in powers of two internally. When you malloc 4 meg,
it adds a small bit of overhead, and requests an 8-meg chunk from the
system. Since your program uses some small memory itself, the malloc goes
over the 8-meg limit and fails. Try your program again, and malloc 1 meg at
a time (comment out the last two lines in your loop). You'll be able to
allocate 7 meg. (don't ask me why it didn't round the 1-meg mallocs .:,
up to two and fail on the fourth malloc; I don't know :) - * -
':`
If you really need to malloc large blocks of memory more efficiently, o o
ftp the malloc.c out of 2.2-CURRENT/src/lib/libc/stdlib. It can |\^/|
malloc 6 meg using your original code. \V/
/_\
-Dan Nelson _/ \_