I just posted the third article about my comet experiments, which covers why I needed to patch libevent to open >1M connections:
http://www.metabrew.com/article/a-million-user-comet-application-with-mochiweb-part-3/ On Tue, 2008-11-04 at 11:40 +0000, Richard Jones wrote: > Hi, > In order to open more than 2^16 connections (HTTP connections in my > case) *from* one machine, you need to use multiple local IPs, because > the maximum local port number is 65536. > evhttp_connection_set_local_address already exists and is suitable for > this. > > The ephemeral port allocator, which is used when you don't specify a > local port numbebr, doesn't distinguish between local addresses though, > so you need to specify the local port manually. > > I added "evhttp_connection_set_local_port", which in conjunction with > evhttp_connection_set_local_address and some tcp/kernel tuning allowed > me to open 1 million http connections from one machine. I brought up 16 > IPs and opened 62,500 from each. > > Please find my patch attached - if there's svn/git/something repo I > should patch against instead of the release tarball I would be happy to > do so. > > Thanks, > RJ > _______________________________________________ > Libevent-users mailing list > Libevent-users@monkey.org > http://monkeymail.org/mailman/listinfo/libevent-users _______________________________________________ Libevent-users mailing list Libevent-users@monkey.org http://monkeymail.org/mailman/listinfo/libevent-users
