Very handy tool if you manage more than a couple of hosts. Homepage: http://www.netfort.gr.jp/~dancer/software/dsh.html

View loadavg of group olsrv:

dsh -g olsrv -- cat /proc/loadavg

Output:

root@foo.bar.tld: 0.00 0.02 0.00 3/124 800
root@oof.bar.tld: 0.01 0.02 0.00 2/111 27063