i've got a command-line php script that i've been using to deliver large
amounts of e-mail. originally it relied on mail() to deliver the
messages but i could easily overload sendmail and bring the box (redhat
7.1) to a crawl. so i am now using the various network functions to
speak smtp directly from the script. i seem to be having a problem with
an excessive number of tcp connections that eventually brings down the
machine.
i have attempted a semi-multi-threaded approach by spawning off
additional copies of the script to deliver more mail simultaneously. so
i might have 100 copies of the script running at the same time. and
this was after dumping a million messages into my mysql-based mail
queue. things may run okay for a few hours...maybe even a day...but
then doing a netstat shows over 10k tcp connections. and the only way
i've found to fix the problem is to reboot the machine.
thinking that i was attempting too many connections at the same time, i
throttled down the number of threads to 25. this slowed down my mail
delivery of course. and it allowed the machine to stay up longer. but
i eventually ran into the same problem after maybe two or three weeks.
just before it died, i was showing over 30k tcp connections.
are they any known issues in the php networking code that would cause
this to happen? as far as i know, i should never have more than 25 tcp
connections open. but i'm not sure if they are not being closed
properly or what.
--
-jr
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