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Operating Systems AIX Performance Problem - High CPU utilization Post 302116417 by jgt on Thursday 3rd of May 2007 06:32:43 PM
Old 05-03-2007
The following is based on my experience with SCO, and may not have any significance, but:
Sometimes when users close terminal emulation sessions, or reboot Windows clients, without signing off the unix system, the telnet session lives on the host, without a client and for some reason consumes a large amount of cpu.
The way to discover this is to run 'ps -leaf |grep ttyp' and compare the output to 'who |grep ttyp' and see if there are unaccounted for sessions.
Then just kill the sessions for which there is no signed on user.
 

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last(1) 							   User Commands							   last(1)

NAME
last - display login and logout information about users and terminals SYNOPSIS
last [-a] [-n number | -number] [-f filename] [name | tty]... DESCRIPTION
The last command looks in the /var/adm/wtmpx file, which records all logins and logouts, for information about a user, a terminal, or any group of users and terminals. Arguments specify names of users or terminals of interest. If multiple arguments are given, the information applicable to any of the arguments is printed. For example, last root console lists all of root's sessions, as well as all sessions on the console terminal. last displays the sessions of the specified users and terminals, most recent first, indicating the times at which the session began, the duration of the session, and the terminal on which the session took place. last also indicates whether the session is continuing or was cut short by a reboot. The pseudo-user reboot logs in when the system is shutdown and when it reboots. Thus, last reboot gives an approximate record of when the operating system instance was shutdown and when it rebooted. This can be used to calculate the availability of the operating system over time. last with no arguments displays a record of all logins and logouts, in reverse order. If last is interrupted, it indicates how far the search has progressed in /var/adm/wtmpx. If interrupted with a quit signal (generated by a CTRL-), last indicates how far the search has progressed, and then continues the search. OPTIONS
The following options are supported: -a Displays the hostname in the last column. -f filename Uses filename as the name of the accounting file instead of /var/adm/wtmpx. -n number|-number Limits the number of entries displayed to that specified by number. These options are identical; the -number option is provided as a transition tool only and is removed in future releases. ENVIRONMENT VARIABLES
Date and time format is based on locale specified by the LC_ALL, LC_TIME, or LANG environments, in that order of priority. FILES
/var/adm/wtmpx accounting file ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+ SEE ALSO
utmpx(4), attributes(5) SunOS 5.11 24 Jul 2004 last(1)
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