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Top Forums UNIX for Dummies Questions & Answers Total cpu usage in percent(%) Post 302475051 by rbatte1 on Friday 26th of November 2010 09:26:55 AM
Old 11-26-2010
The supplied command sar it probably what you are after. If you are after the value since last boot, just fire it off without parameters. Depending on your installation, you may get hourly or 5 minute stats, but it is averaged at the end. This is usually controlled by the running of sa1, often by the cron table of user account adm.

The columns are usually %usr %sys %wio %idle, so it's up to you to decide if you want 100-%idle or if I/O wait should be considered.

If this answers what you need, great.

If you need average at the moment, you can supply a variety of parameters. You could have
Code:
sar 1 1

... which gets the information from the last 1 second. You can stretch this by increasing the first value. You can vary it by increaing the second value to show you more samples, e.g.
Code:
sar 3 5

... will report the usage over the last 3 seconds 5 times and then an average.

There are also reports generated by sa2, again usually by the cron table of adm. Read your manaul pages about sa2 for where this file is likely to be in your implementation if you have it enabled.





I hope that this helps.

Robin
Liverpool/Blackburn
UK
This User Gave Thanks to rbatte1 For This Post:
 

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sa(8)							      System Manager's Manual							     sa(8)

Name
       sa, accton - print process accounting statistics

Syntax
       /etc/sa [ options ] [ file ]

       /etc/accton [ file ]

Arguments
       file    With  an  argument naming an existing file, causes system accounting information for every process executed to be placed at the end
	       of the file.  If no argument is given, accounting is turned off.

Description
       The command reports on, cleans up, and generally maintains accounting files.

       The is able to condense the information in into a summary file which contains a count of the number of times each command  was  called  and
       the time resources consumed.  This condensation is desirable because on a large system can grow by 100 blocks per day.  The summary file is
       normally read before the accounting file, so the reports include all available information.

       If a file name is given as the last argument, that file will be treated as the accounting file.	The file is the default.

       Output fields are labeled: "cpu" for the sum of user+system time (in cpu seconds), "re" for real time (also in cpu seconds), "k"  for  cpu-
       time  averaged  core usage (in 1k units), "avio" for average number of I/O operations per execution.  With options fields labeled "tio" for
       total I/O operations, "k*sec" for cpu storage integral (kilo-core seconds), "u" and "s" for user and system cpu time  alone  (both  in  cpu
       seconds) will sometimes appear.

Options
       -a      List  all  command names including those containing unprintable characters and those used only once. By default, places all command
	       names containing unprintable characters and those used only once under the name `***other.'

       -b      Sort output by sum of user and system time divided by number of calls.  Default sort is by sum of user and system times.

       -c      Besides total user, system, and real time for each command, print percentage of total time over all commands.

       -d      Sort by average number of disk I/O operations.

       -D      Print and sort by total number of disk I/O operations.

       -f      Force no interactive threshold compression with option.

       -i      Do not read in summary file.

       -j      Instead of total minutes for each category, give seconds per call.

       -k      Sort by cpu-time average memory usage.

       -K      Print and sort by cpu-storage integral.

       -l      Separate system and user time; normally they are combined.

       -m      Print number of processes and number of CPU minutes for each user.

       -n      Sort by number of calls.

       -r      Reverse order of sort.

       -s      Merge accounting file into summary file when done.

       -t      For each command, report ratio of real time to the sum of user and system times.  If the sum of user and system times is too  small
	       to report, `*ignore*' appears in this field.

       -u      Superseding all other flags, print for each command in the accounting file the user ID and command name.

       -v      Followed  by  a number n, types the name of each command used n times or fewer.	Await a reply from the terminal; if it begins with
	       `y', add the command to the category `**junk**.' This is used to strip out garbage.

Restrictions
       Accounting is suspended when there is less than 2% free space on disk.  Accounting resumes when free space rises above 4%.

Files
       Raw accounting

       Summary

       Per-user summary

See Also
       acct(2), ac(8)

																	     sa(8)
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