Miscellaneous Tips

Moniter processes owned by a specified user

top -b -u [username]

I/O throughput

sudo iotop

sudo fuser -vm /dev/md0

linux - how to find the process that is doing io frequently? - Stack Overflow

Batch-install packages on all nodes from server node

Note: add -y (--assumeyes) for yum, otherwise the process will get stuck.

#!/bin/sh

yum -y install numpy python-devel python-matplotlib python-yaml

for node in 1 2 3 4 5 6; do 
ssh node0$node "yum install numpy python-devel python-matplotlib python-yaml"
done