[MUD-Dev] Massive Connections

[Kevin Scott London]

On Wed, 19 Apr 2000, Christopher Kohnert wrote:

> Can anyone point me at some information regarding the ability to support
> massive numbers simultaneous connections (read: 1000+).  I've looked at
> the various documents in the library (like the c10k one), but they
> really aren't all that helpful.  Does a server of this magnitude simply
> require massive amounts of memory, or am I doing something terribly
> wrong?  Any suggestions as to how I can increase the number of
> simultaneous (active) connections?   I say 'active' here because I can
> easily connect to many sockets if they aren't actually sending or
> receiving any data, so it is my guess that the OS (in this case Linux)
> is doing some buffering of sorts which eats up all my memory.  I
> couldn't get past 500 or so on a machine with 256 megs of RAM.  Am I
> wrong in thinking that the poor machine should be able to handle many
> more than that?
> 
> Thanks,
> Chris

It could be several things, but each connection requires an open
descriptor which can be limited by the system.  So depending on which OS
you are on in this case linux, in tcsh it has a built in command called
limit you will see something similar to:
openfiles       1024 
or perhaps
descriptors     64 
on another system.  There are system limits which you can usually find
out by setting it to unlimited, for example:
limit openfiles unlimited
Then type limit.  So if you are forgetting to close descriptors, or exceed
the limit then you would see that kind of behavior.  Just guessing though,
as it could be several factors.

Kevin London

: Kevin London   Internet: london at cs.utk.edu
: Research Associate, Department of Computer Science
: Ayres 216      Phone: (423) 974-5790
: University of Tennessee, Knoxville





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