Restart puma if physical memory usage is high.

crontab

*/15 * * * * /path/to/restart_if_high_memory.sh >> /tmp/restart_if_high_memory.log 2>&1

restart_if_high_memory.sh

#!/bin/bash -x

set -e

HOME=/path/to/app

cd $HOME

# returns 1 if physical memoryusage is higher than 80%
usage=`free -m  | sed -n 2p | awk '{ printf("%d",  ($3/$2)/0.8) }'`

if [ $usage -ge 1 ]; then
  cd path/to/current && kill -USR2 `cat tmp/pids/puma.pid`
fi