Re: real POSIX.1b semaphores

David Wuertele (
21 Nov 1996 12:14:26 +0900

"David S. Miller" <> writes:

> 4 billion processes, times sizeof(struct task_struct), that alone is
> around 2 terabytes. In reality 4 billion processes would take up at a
> minimum around 6 or 7 terabytes. I give it 5 or 6 years for this to
> matter at all. ;-)
> Even with a million users on a single machine (even a NUMA one!) each
> of them would need to spawn 4,000 processes to reach this level of
> insanity...

Or turn it around: how about applications where a single request can generate a
million processes? Maybe a linux layer on top of a multi-million node network
microkernel, acting as a database server to a few thousand clients?

Or am I from outer space?