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Full Discussion: Help with prstat
Top Forums UNIX for Dummies Questions & Answers Help with prstat Post 67284 by izy100 on Tuesday 22nd of March 2005 08:16:43 AM
Old 03-22-2005
=)
It is the same as the load average when you run a 'uptime'

Do a man page on uptime:
'run queue over the last 1, 5 and 15 minutes.'

Performance is subjective...
You talking about throughout or latency or response time or bottleneck or etc..... They are all performance..

If you are looking for a magic number, I supposed for UltraSPARC II, Adrian cockroft from SUN mentioned preferably less than 4~5 runnable jobs per CPUs, (So you see, it depends on the quality and quantity of CPUs you have)
to avoid spending too much time in context-switching.
This load average is the same as the 'r' you get from vmstat. Some people call this CPU queue length.

If you are asking about this to solve a performance problem, you need a baseline to compare.

E.g.
I have a Oracle DataMart and Warehouse of 6 CPUs (UltraSPARC III), often hover around 40 jobs. No user complain.
I also have another performance sensitive Oracle OLTP DB with 6 CPUs (UltraSPARC III). Once the queue hits 20, user complain.
 

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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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