help increase process/kernel memory please

Tom Judge tom at
Tue Oct 31 16:56:53 UTC 2006

Per olof Ljungmark wrote:
> Hi,
> I clearly have a problem figuring out how to increase the limits for 
> memory available to a process and the kernel.
> I'm running a Perl app that need lots of memory and I would like to 
> make around 2G available to it, the box has 4G physical RAM.
> Which knob(s) should be tweaked? System is running 6-STABLE from 
> around 1st of October.
> This is what I see when the process exits:
> Out of memory during "large" request for 528384 bytes, total sbrk() is 
> 536416256 bytes
> I'm depending on a solution to this and would be a really happy person 
> if someone could please guide me.
> Per olof
You should try setting kern.maxdsize in /boot/loader.conf and then 
reboot the system.  This sysctl sets the maximum data size of a running 
process you may also have to tune some of the limits using ulimit.  The 
example below sets the max data size to 1.5Gb:



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