Increasing the datasize limit

[Christopher Cowart]

Hello,

I have a large data-crunching job once a week that needs some more heap
space. How do I go about increasing the datasize limit for a process?

Here's what I've tried:

| $ sudo su -
| crunch# limits
| Resource limits (current):
|   cputime          infinity secs
|   filesize         infinity kB
|   datasize           524288 kB
|   stacksize           65536 kB
|   coredumpsize     infinity kB
|   memoryuse        infinity kB
|   memorylocked     infinity kB
|   maxprocesses         5547
|   openfiles           11095
|   sbsize           infinity bytes
|   vmemoryuse       infinity kB
| crunch# limit datasize 1048576
| crunch# limits
| Resource limits (current):
|   cputime          infinity secs
|   filesize         infinity kB
|   datasize           524288 kB
|   stacksize           65536 kB
|   coredumpsize     infinity kB
|   memoryuse        infinity kB
|   memorylocked     infinity kB
|   maxprocesses         5547
|   openfiles           11095
|   sbsize           infinity bytes
|   vmemoryuse       infinity kB
| crunch# grep -C 8 '^[^#].*datasize' /etc/login.conf
| default:\
|         :passwd_format=md5:\
|         :copyright=/etc/COPYRIGHT:\
|         :welcome=/etc/motd:\
|         :setenv=MAIL=/var/mail/$,BLOCKSIZE=K,FTP_PASSIVE_MODE=YES:\
|         :path=/sbin /bin /usr/sbin /usr/bin /usr/games /usr/local/sbin /usr/local/bin /usr/X11R6/bin ~/bin:\
|         :nologin=/var/run/nologin:\
|         :cputime=unlimited:\
|         :datasize=unlimited:\
|         :stacksize=unlimited:\
|         :memorylocked=unlimited:\
|         :memoryuse=unlimited:\
|         :filesize=unlimited:\
|         :coredumpsize=unlimited:\
|         :openfiles=unlimited:\
|         :maxproc=unlimited:\
|         :sbsize=unlimited:\

According to setrlimit(2), "Only the super-user may raise the maximum
limits," but apparently, I can't even increase the limit as the
superuser.

What am I missing?

-- 
Chris Cowart
Network Technical Lead
Network & Infrastructure Services, RSSP-IT
UC Berkeley
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