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Top Forums UNIX for Advanced & Expert Users Sun: High kernel usage & very high load averages Post 98132 by rhfrommn on Monday 6th of February 2006 11:21:56 AM
Old 02-06-2006
I strongly suspect this server needs more memory. If you look at the IO Wait it is very small, meaning the I/O isn't causing problems. But the free memory is only a few percent of the total, meaning you are out of memory. The system having to move chunks of data between main memory and swap is what is driving your CPU usage through the roof. If you get more memory, it should solve the problem since that swapping can stop.

One way to verify that is to use sar -g to check how much paging activity is going on. Here is an example from my box.

krypton$ sar -g 5 5

SunOS krypton 5.10 Generic_118822-02 sun4u 02/06/2006

10:18:34 pgout/s ppgout/s pgfree/s pgscan/s %ufs_ipf
10:18:39 0.00 0.00 0.00 0.00 0.00
10:18:44 0.00 0.00 0.00 0.00 0.00
10:18:49 0.00 0.00 0.00 0.00 0.00
10:18:54 0.00 0.00 0.00 0.00 0.00
10:18:59 0.00 0.00 0.00 0.00 0.00

Average 0.00 0.00 0.00 0.00 0.00
krypton$

Krypton isn't heavily loaded and has plenty of free memory, so there is no paging or swapping going on at all. If your box shows non-zero numbers here it is out of memory and having to swap. Occasional non-zero is ok as it may just be moving old data out of memory, but if it is constantly a high number it is a problem. My guess is that is what you'll see.
 

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uptime(1)						      General Commands Manual							 uptime(1)

NAME
uptime, w - show how long system has been up and/or who is logged in and what they are doing SYNOPSIS
[user] [pset_list]] [user] [pset_list]] DESCRIPTION
prints the current time, the length of time the system has been up, the number of users logged on to the system, and the average number of jobs in the run queue over the last 1, 5, and 15 minutes for the active processors. is linked to and prints the same output as displaying a summary of the current activity on the system. Options and recognize the following options: Print the current time, the length of time the system has been up, and the number of users logged on to the system in the first line of the output. The average number of jobs in the core over the last 1, 5, and 15 minutes for the active processors is also printed. When used with the option, the load averages for the processor sets (psets) are calculated on a core basis. Suppress the first line and the heading line. This option should not be used with the option. This option assumes the use of the option to Use long output. This option assumes the use of the option to Print the current time, the length of time the system has been up, and the number of users logged on to the system in the first line of the output. The load averages over the last 1, 5, and 15 minutes for the processor sets (psets) given in the command line, pset_list, are displayed in the subsequent lines. If no arguments are given, the load averages are displayed for all the psets in the system. If pset id of an empty pset is given in the command line, a corresponding message will be displayed. If the kernel does not have the pset capability, gives an error. The option cannot be used along with other options except Use the short form of output for displaying terminal information. The terminal name is abbreviated, and the login time and CPU times are suppressed. Print only the first line describing the overall state of the system. This is the default for the command. Print a summary of the current activity on the system for each user. This is the default for the command. EXAMPLES
The command: produces text resembling the following: depending upon the current status of the system. The command: gives the load average of all the psets in the system. If 0, 94, 95, and 97 are existing psets in the system, the output will look like the following: The command: gives output which looks like the following if 94 and 95 are valid pset ids: The command: gives the load average of the system, producing output resembling the following: The command: gives the load average of all the psets in the system. If 0 and 1 are psets in the system, the output will look like the following: AUTHOR
was developed by the University of California, Berkeley and HP. SEE ALSO
mpctl(2), pset_ctl(2). uptime(1)
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