Memory usage
while : ;do date;echo "================";ps -eo pid,pmem,rss,comm --sort rss|egrep "PID|java" |tail -12;echo "=================";sleep 5;done
top example
nohup top -b -d 2 | egrep --color=auto "top|Task|Cpu|Mem|Swap|PID|elastic" >> top.out &