macOS 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=1000
net.inet.tcp.msl: 15000 -> 1000
Run siege.config to create the ~/.siegerc config file.
