Of course, we have a problem if some other platform allows
ulong.max open files...
You can increase (on Linux) maximal number of open files by
adding something like
your_username hard nofile 65536
to /etc/security/limits.conf and using ulimit. You can increase
it up to /proc/sys/fs/file-max (which is 394062 by default on my
machine but can also be increased) that way.
I don't know what the maximal valid value of
/proc/sys/fs/file-max is, but it can
not be more than int.max, since file descriptors are ints.
