Re: Max tcp connections

Dan Kegel (dank@alumni.caltech.edu)
Thu, 11 Nov 1999 19:03:56 -0800

David Schwartz wrote:
> Poll is O(1) as well if implemented correctly. Consider the following loop:
>
> while(1)
> {
> Poll();
> Do_the_io_poll_found();
> }
>
> Now, poll itself is O(n), but doing the I/O is going to be O(n) (here n
> represents the number of fds or clients). So we make a call that is O(n)
> with a frequency that is O(1/n). Hence the overall overhead of poll is O(1)
> with respect to the number of active connections. Signals can't touch that
> scalability.

How would it change the comparison if we had a vector version of
sigwaitinfo that could return n siginfo's at once?

- Dan

-- 
(The above is just my personal opinion; I don't speak for my employer,
 except on the occasional talk show.)


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