sysctl_script.sh

#!/usr/bin/env bash
# Author: Robert Martin, Ohio University
# Checks sysctl variable vaues on OSX to see if they are large enough
# to handle the shared memory requirements for ION

case $OSTYPE in
    *darwin*)
        VAR_LIST=('kern.sysv.shmmax' 'kern.sysv.shmmin' 'kern.sysv.shmmni'
                  'kern.sysv.shmseg' 'kern.sysv.shmall' 'net.inet.udp.maxdgram'
                  'kern.sysv.semmns' 'kern.sysv.semmni' 'net.inet.udp.recvspace')
    ;;
    *freebsd*)
        VAR_LIST=('kern.ipc.shmmax' 'kern.ipc.shmmin' 'kern.ipc.shmmni'
                  'kern.ipc.shmseg' 'kern.ipc.shmall' 'net.inet.udp.maxdgram'
                  'kern.ipc.semmns' 'kern.ipc.semmni' 'net.inet.udp.recvspace')
    ;;
    *)
        echo "No need to update sysctl variables."
        exit 0
    ;;
esac

VAR_VALUE=(2147483648 1 32 32 1048576 65536 32000 128 168320)
CUR_VALUE=0
I=0
CHANGE=0

while [[ $I -lt ${#VAR_LIST[@]} ]]; do
    CUR_VALUE=`sysctl ${VAR_LIST[$I]} | awk '{ print $2 }'`
    if [[ $CUR_VALUE -lt ${VAR_VALUE[$I]} ]]; then
        echo "${VAR_LIST[$I]}=${VAR_VALUE[I]}"
        let CHANGE=1
    fi
    let I=$I+1
done

if [[ $CHANGE == 0 ]]; then
    echo "This system is ready to run ION."
else
    echo
    echo "Your system's sysctl configuration needs be updated in order to"
    echo "run ION. This is usually done by copying the above assignments into"
    echo "/etc/sysctl.conf or /boot/loader.conf and rebooting."
    echo ""
    echo "If you are running macOS, use the install_macos_sysctl.sh script"
    echo ""
    echo "If you are running FreeBSD, shmmni, shmseg, shmmns, and semmni should"
    echo "  be updated through /boot/loader.conf; The other"
    echo "  parameters can be updated using sysctl command or via /etc/sysctl.conf."

    exit 1
fi