siege Mac OS X caveats

gistfile1.txt

Mac OS X has only 16K ports available that won't be released until socket
TIME_WAIT is passed. The default timeout for TIME_WAIT is 15 seconds.
Consider reducing in case of available port bottleneck.

You can check whether this is a problem with netstat:

    # sysctl net.inet.tcp.msl
    net.inet.tcp.msl: 15000

    # sudo sysctl -w net.inet.tcp.msl=100
    net.inet.tcp.msl: 15000 -> 100

To change the number of available ephemeral ports, change the net.inet.ip.portrange.{first, hifirst} sysctls:

sudo sysctl -w net.inet.ip.portrange.hifirst=16384
sudo sysctl -w net.inet.ip.portrange.first=16384

This will allow the OS to use 49151 ports.

To check the current number of TIME_WAIT for a specific port (5000): netstat -an|grep 5000|grep TIME_WAIT |wc -l