On Thu, Mar 09, 2000 at 02:43:59PM +0530, S Ashok Kumar wrote:
> Is there any limit on tcpserver forking processes? I have configured
> tcpserver to fork qmail-smtpd with concurrent sessions of 2000. I have
> made a simulator that makes upto 2000 connections to qmail-smtpd. But
> when the simulator reaches 1247 connections, tcpserver reports error
> which is:
>
> tcpserver: warning: dropping connection, unable to fork: temporary
> failure
>
> I am testing this on a P-III, 500MHz RedHat Linux 6.1 machine with
> 512MB RAM and 1GB SWAP. The machine is off-line and there is no queue. I
> am only using it to stress test the machine so I can arrive at a value
> on number of simultaneous connections this machine can take. The
> simulator connects to port 25 and simply says "HELO localhost\r\n".
>
> /proc/sys/fs/file-max is defined as 65536. Is there any additional
> fine-tuning I need to do with the kernel or file-system?
Raising the file-max is no good. tcpserver wants to fork and create a
new process. Increase your max-proc (or equivalent) limit.
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