To increase the soft limit for C shells, enter:
limit descriptors n
For Bourne shells, enter:
ulimit -Sn new_value
where n is the current value for the soft limit, and new_value is the value to which you want to increase the soft limit.
You can use the preceding commands in your runserver file to increase the hard and soft limits. Because the runserver file is a Bourne shell script, be sure to use the Bourne shell versions of these commands in the runserver file.