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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!bunyip.cc.uq.oz.au!munnari.OZ.AU!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.mathworks.com!fu-berlin.de!news.dfn.de!news.gwdg.de!news.gwdg.de!not-for-mail From: kheuer@gwdg.de (Konrad Heuer) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Resource Limits Date: 7 Mar 1996 10:33:09 +0100 Organization: GWDG, Goettingen Lines: 58 Message-ID: <4hmagl$mqf@gwdu19.gwdg.de> NNTP-Posting-Host: gwdu19.gwdg.de Summary: Pgm gets only half of data seg limit Keywords: limit, ulimit X-Newsreader: NN version 6.5.0 #8 (NOV) 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 cputime 900 seconds limit datasize 8192 kbytes limit stacksize 1024 kbytes limit coredumpsize 0 kbytes limit memoryuse 2048 kbytes limit memorylocked 256 kbytes limit maxproc 40 limit openfiles 64 My test program is: #include <stdio.h> #include <stdlib.h> #include <unistd.h> #define MEGABYTE 1048576 #define MEMBLOCK 1 * MEGABYTE #define SECONDS 5 int main(int argc, char *argv[]) { void *buffer; long memsize = MEMBLOCK; while (buffer = malloc(memsize)) { memset(buffer, 0, memsize); printf("%s: %4d MB\n", argv[0], memsize / MEGABYTE); sleep(SECONDS); free(buffer); memsize += MEMBLOCK; } } The program terminates after allocating 4 MB. E.g., if I double the data limit to 16 MB, the program gets 8 MB. All this is independent of the login shell I use (bash, csh, ksh, tcsh, zsh) except the Bourne shell which doesn't support limits of course. Has anyone an idea about that? Is it a misunderstanding of mine or between the kernel and the shells? In any case, on other system it works well (AIX, DEC UNIX, SOLARIS). Thanks for any answer. Konrad Heuer Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH Goettingen Am Fassberg, 37077 Goettingen, Germany (kheuer@gwdg.de)