[Galene] Re: accept4: too many open files

[Juliusz Chroboczek <jch@irif.fr>]

> Also, Juliusz, is there a recommendation for number of file descriptors
> needed vs number of clients?

At the very least

  k·∑ᵢsᵢrᵢ

where the sum ranges over all groups, sᵢ is the number of senders in group i,
rᵢ is the number of receivers, and k is some constant, k≥2, probably k≈4.

So for a meeting with 10 people (s=r=10), you'll need on the order of 400
file descriptors.  On the other had, for a lecture with 60 students (s=1,
r=60), you need just some 250 file descriptors — quadratic scaling in the
first case, linear in the second.  Of course, that will double as soon as
you share a document.