Re: Finding out Processor Usage

uptime is reasonably portable across Unices and is simple to parse:

my $info = `uptime`;
($avg_1, $avg_5, $avg_15) = $info =~ /load average:\s+(\S+),\s+(\S+),\
+s+(\S+)/;
print "$avg_1, $avg_5, $avg_15\n";
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-Mark

Comment on Re: Finding out Processor Usage Select or Download Code

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Re: Re: Finding out Processor Usage by tachyon (Chancellor) on Apr 11, 2004 at 00:32 UTC
Load average is not CPU usage. Lot's of people on this thread are correlating load average and CPU usage. I suggest this reference UNIXŽ Load Average Part 1: How It Works cheers tachyon	[reply]
Re: Re: Finding out Processor Usage by stvn (Monsignor) on Apr 10, 2004 at 23:32 UTC
I looked at uptime, but i wasnt sure how its output relates to CPU percentage, like which is output by top. Do you have any insight into this? Thanks. -stvn	[reply]
Re: Re: Re: Finding out Processor Usage by tachyon (Chancellor) on Apr 11, 2004 at 00:26 UTC
uptime is the same as the first line of top(1) or w(1). Load average however (which is what is reported there) is not CPU usage. Load average is the average number of processes waiting to run/running over the last x period. The higher the load average the greater the load on the system as the OS queues processes for a time slice. This has a vague relation to CPU usage but that is all. See this for more details. cheers tachyon	[reply]
Re: Re: Re: Finding out Processor Usage by insensate (Hermit) on Apr 11, 2004 at 00:16 UTC
`uptime` will output the current time, the time the system has been up, the number of users connected and the load averages. The load averages are a condensation of the %usr, %sys and %wio cpu statistics at that given time. Where usr and sys represent the % cpu cycles dealing with user and system calls respectively and wio are the percentage of cycles that are bound on io waits.	[reply] [d/l]