On Mon, Feb 1, 2010 at 5:08 AM, MOKRANI Rachid <Rachid.MOKRANI at ifp.fr> wrote: > Hi, > > I need to monitor a workstation (Centos 5 x86_64). > > I need to obtain informations about : > > - cpu utilization per user, per a period, how many days per user, > > Any ideas about a good and simple free tool ? > > Regards. In addition to the other suggestions (although those are typically used for system-level monitoring), you should look into the "psacct" package. There is an introduction to it here: http://www.cyberciti.biz/tips/howto-log-user-activity-using-process-accounting.html