in reply to Maximum number of concurent sockets

Perl itself doesn't have such limits. But limits may be imposed on by your OS, either as limits for each process, or as system-wide limits (that is, limits that are shared by all processes). Depending on your OS, some limits can't be changed, some can, but require a reboot (some after a recompilation of your kernel) and some can be changed on the fly. But that's all very OS dependent, and has not much to do with Perl.