Apache2::Resource uses the BSD::Resource module, which uses the C
function setrlimit to set limits on system resources such as memory
and cpu usage.
Any RLIMIT operation available to limit on your system can be set
by defining that operation as an environment variable with a PERL_
prefix. See your system setrlimit manpage for available resources
which can be limited.
The following limit values are in megabytes: DATA, RSS,
STACK, FSIZE, CORE, MEMLOCK; all others are treated as
their natural unit.
If the value of the variable is of the form S:H, S is treated as
the soft limit, and H is the hard limit. If it is just a single
number, it is used for both soft and hard limits.