Let me attack this. I'm bored. I'm on Windows XP SP 2, and I'll try this from the command line.
I coded a simple server in PHP that just accepts the connection and listens. It doesn't attempt to send any data, its only select loop is to wait for a new connection attempt. I also wrote a load program. When attempted with 49 sockets (50 on the server), it worked fine, select and all.
Server: http://labs.jed.bz/HCJ/server.php.txt Client: http://labs.jed.bz/HCJ/load.php.txt
However, when I tried 500, odd things happened.
The server (!) died due to Windows XP's DEP, which I removed for cli.exe and retried. It then died again (!) because of "an existing connection [being] forcibly closed".
I then lowered the limit to 70 and tried again. The server accepted 69:
accepted #68 of 70 accepted #69 of 70 .......................
Before I could telnet in to make 70, the client died:
connecting #69 of 69 ... ok waiting for spew Warning: socket_select(): unable to select [0]: An operation was attempted on something that is not a socket. in F:\Projects\HCJ\load.php on line 38 spew! done!
Curious. The problem replicates itself here.
I'm not sure. For the first time with PHP I honestly have no clue where to start attacking this problem. It could be a Windows limitation, but for that to be the case the scripts will have to be run on a UNIX system as well.
I simply don't know. Very strange indeed. It was worth the hour I put into it, because I'm interested -- I've been playing with PHP daemons on Win32 for a while now, and this select limitation concerns me.
I'll submit this as a bug report. Feel free to comment, bug #30852
Jed
Hans-Christian Jehg wrote:
Hi
Im building a TCP server in PHP 5.0.2 on Windows. It will have to serve a lot of clients (500+) with low traffic.
During this I have noticed that socket_select seems unable to supervise more than 64 connections at a time (Not good when I need 500+). It stops with a message that
"Socket select failed, error code is: 10038, error message is: An operation was at tempted on something that is not a socket."
These are the outputs of socket_last_error() and socket_strerror(socket_last_error()).
And now forthe questions:
Does any of you have the same experience?
Is it something to do with Windows? Does this limitation exist on Linux?
Is it just a bug?
Any good suggestions?
Best regards and thanx in advance
HC
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