05-20-2014
If there was any such thing as ideal limits, the system would be locked into using the ideal limits and there would be no adjustment you could make. That said, a couple of issues do come to mind...
I do not like nproc to be unlimited. If someone does a while(1) fork(); I would like to be able to recover without a reboot.
We are required to justify every instance of core being any value other than 0. This is a security concern. A core file can contain information that should not be exposed. And assuming that the address space is also unlimited core files can consume lots of disk space. When a filesystem runs out of space one of the first things that admins look for are core files. Settings core to zero prevents the problem. Developers often need core files... so be it. But our default state is no core files and then we enable core files where we must.
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CORE(5) BSD File Formats Manual CORE(5)
NAME
core -- memory image file format
SYNOPSIS
#include <sys/param.h>
DESCRIPTION
A small number of signals which cause abnormal termination of a process also cause a record of the process's in-core state to be written to
disk for later examination by one of the available debuggers. (See sigaction(2).) This memory image is written to a file named by default
core.pid, where pid is the process ID of the process, in the /cores directory, provided the terminated process had write permission in the
directory, and the directory existed.
The maximum size of a core file is limited by setrlimit(2). Files which would be larger than the limit are not created.
The core file consists of the Mach-O(5) header as described in the <mach-o/loader.h> file. The remainder of the core file consists of vari-
ous sections described in the Mach-O(5) header.
NOTE
Core dumps are disabled by default under Darwin/Mac OS X. To re-enable core dumps, a privileged user must do one of the following
* Edit /etc/launchd.conf or $HOME/.launchd.conf and add a line specifying the limit limit core unlimited
* A privileged user can also enable cores with launchctl limit core unlimited
* A privileged user can also enable core files by using ulimit(1) or limit(1) depending upon the shell.
SEE ALSO
gdb(1), setrlimit(2), sigaction(2), Mach-O(5), launchd.conf(5), launchd.plist(5), sysctl(8)
HISTORY
A core file format appeared in Version 6 AT&T UNIX.
BSD
June 26, 2008 BSD