#!/bin/sh

#
# Copyright (c) 2018 Dell EMC Isilon
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
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# 2. Redistributions in binary form must reproduce the above copyright
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# SUCH DAMAGE.
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# Test OOM killing.

# sort stuck in "pfault" seen.
# https://people.freebsd.org/~pho/stress/log/oom2.txt

[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
[ `sysctl -n vm.swap_total` -gt 0 ] && { swapoff -a; off=1; }

[ `sysctl -n hw.physmem` -gt $((32 * 1024 * 1024 * 1024)) ] &&
	echo "RAM should be capped to no more than 32GB"
n=`sysctl -n hw.ncpu`
n=`jot $n`
start=`date +%s`
while [ $((`date +%s` - $start)) -lt 300 ]; do
	for i in $n; do
		sort < /dev/zero > /dev/null 2>&1 &
	done
	wait
done
[ $off ] && swapon -a
exit 0