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The ''XenMon'' tool is useful for monitoring the performance Xen domains, particularly when identifying with which domains are responsible for the highest I/O or processing loads on a system.

XenMon accepts a range of command-line options which control various aspects of the monitoring. For a breakdown of these options simply pass the ''--help'' argument through through to ''xenmon.py'':

Anyone who has been using UNIX or Linux for any length of time (particularly since the days before GUI desktop environments) is probably familiar with the ''top'' command. This long standing toll tool is used to display information, such as CPU and memory usage, about processes running on a particular system. One of the best features of ''top'' is that is puts the process making the heaviest use of a particular resource at the top of the list. When a system is exhibiting performance degradation the ''top'' command is often the first port of call for the experienced system administrator.

''XenTop'' is essentially a Xen version of the origianl original ''top'' utility and is used to show information about all the domains running on a particular system.

The ''XenTop'' tool is launched by typing ''xentop'' as root at the command-line. Whilst xentop can be launched without any commaondcommand-line options , it is worth knowing that a range of options are available and can be listed using the --help flag: