This is one Ubuntu 9.10 server.
Also how to see memory usage per process?
ps axo pid,ppid,rss,vsz,nlwp,cmd
Use the following to show the memory use of a single process:
pmap -d <PID>
Try this little hamster in Perl for a simple system overview (on Linux):
Groups processes by name, e.g. all the processes named "httpd" go into one line; or a special process is given its own line.
For each group give: