Messages in this thread | | | Date | Thu, 16 Sep 1999 22:54:45 -0700 | From | Dan Kegel <> | Subject | re: > 15K simultaneous connections EXAMPLE program/OS config needed, was: Re: POSIX aio vs completion ports |
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"Stephen D. Williams" <sdw@lig.net> asked: > Stephen, or anyone else, are you aware of a test program that illustrates the > use of existing (2.2.12+) mechanisms to efficiently handle many sockets?
There are a couple programs like that listed at http://www.kegel.com/c10k.html
> Is there a limit to the number of connections per IP address, assuming many > different client IP's? (In other words, is there any problem with running out > of local sockets? There shouldn't be really since a client program that > doesn't specify a certain local socket doesn't care if it has that same socket > number used with N different remote IP's.) > > I really want to handle 100,000 TCP connections simultaneously per system, > eventually.
Guess I should rename my page c100k.html :-)
Alan recently said that each handle takes up 20k in kernel space. so 100,000 connections could take up 100k*20k = 2GB of RAM, which might cause some trouble except on very recent kernels (and maybe you still need a patch for this).
I'd be interested in hearing whether anyone has gone past 64k handles opened; who knows, maybe some bad code somewhere is using a short to hold an fd.
- Dan
-- (The above is my opinion alone, and not that of my employer)
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