OK, having done more digging, this bizarre 251-255 connections per
socket limit seems to be an OS X thing. (Linux people, any comments?)
At least that's I've read: http://www.macgeekery.com/tips/
configuration/mac_os_x_network_tuning_guide_revisited#comment-1433
So... Do any Mac OS X gurus out there know how to increase OS X
Server's (10.4.11) maximum connections per socket value? There seems
to no such setting in sysctl or ulimit. Any ideas? Anyone? Anyone?
...Rene
On 11-Dec-07, at 4:55 PM, René Fournier wrote:
On 11-Dec-07, at 4:32 PM, René Fournier wrote:
Just curious what people found the limits to be with
stream_socket_server(), in terms of maximum concurrent
connections, packet sizes, etc. I'm am presently stress-testing a
multi-client socket server and am finding I can sometimes break it
with as few as 100 concurrent connections, and always break it
with [precisely] 252 connections--with a variety of errors getting
thrown:
Client-side (>100 connections, sometimes):
PHP Warning: stream_socket_client(): unable to connect to tcp://
192.168.0.41:2222 (Operation timed out) in /Tuning/client.php on
line 3
PHP Notice: fwrite(): send of 68 bytes failed with errno=32
Broken pipe in /Tuning/client.php on line 14
Server-side error ( 252+ connections, every time):
PHP Warning: stream_select(): supplied argument is not a valid
stream resource in /Tuning/server.php on line 15
Interestingly, this 251 connection limit does not appear to be
obviously system-related (I am running Mac OS X 10.4.11). I can run
two instances of server.php and have each client.php spawn 175
connections (350 total concurrent to the machine), with no problem.
Interestingly, the above server-side error only occurs when 252
clients are connected. At 251, it's okay. At 252, it generates the
above PHP Warning. (Which really is strange. Anyone have any ideas?)
If anyone is interested, I will post the sample code I'm using, in
case--perish the thought--the problem is self-inflicted. :-)
...Rene
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