How do I calculate the current CPU usage?

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: How do I calculate the current CPU usage? by Joost (Canon) on Jun 21, 2007 at 01:51 UTC
Searching for CPU turns up Sys::Info::CPU which gives several % values for CPU load. Note that "real" CPU load at any given moment is either 0% or 100%. "What should it profit a man, if he should win a flame war, yet lose his cool?"	[reply]
Re^2: How do I calculate the current CPU usage? by Anonymous Monk on Jun 21, 2007 at 05:26 UTC
This is not helpful. In the documentation it says the values are for one, five and fifteen minutes ago. I specifically asked for the current CPU usage. It is not clear what you mean with »"real" CPU load«. That which I am talking about is on a smooth scale between 0% and 100%.	[reply]
Re^3: How do I calculate the current CPU usage? by isha (Sexton) on Jul 02, 2007 at 05:46 UTC
How do I calculate the current CPU usage on the Windows XP SP2 machine using Perl?	[reply]
Re: How do I calculate the current CPU usage? by andreas1234567 (Vicar) on Jun 21, 2007 at 05:55 UTC
You did not mention your platform. vmstat reports (amongst other things) percentages of total CPU time: us: Time spent running non-kernel code. (user time, including nice time) sy: Time spent running kernel code. (system time) id: Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time. wa: Time spent waiting for IO. Prior to Linux 2.5.41, shown as zero. `$ vmstat -n 1 procs -----------memory---------- ---swap-- -----io---- --system-- --- +-cpu---- r b swpd free buff cache si so bi bo in cs us +sy id wa 1 0 160 84600 330848 251724 0 0 74 102 1 0 8 + 2 90 0 0 0 160 84600 330848 251724 0 0 0 0 1018 337 1 + 0 99 0 0 0 160 84600 330848 251724 0 0 0 160 1011 343 3 + 0 97 0 0 0 160 84600 330848 251724 0 0 0 0 1019 351 1 + 0 99 0 0 0 160 84608 330848 251724 0 0 0 0 1003 344 2 + 0 98 0` [download] -- print map{chr}unpack(q{A3}x24,q{074117115116032097110111116104101114032080101114108032104097099107101114})	[reply] [d/l]
Re^2: How do I calculate the current CPU usage? by Anonymous Monk on Jun 21, 2007 at 06:10 UTC
This is close enough to what I needed. Thanks!	[reply]
Re: How do I calculate the current CPU usage? by sago (Scribe) on Jun 21, 2007 at 02:03 UTC
Try to use this below command in the perl script. I tried this in linux/unix OS. Unix Command $ grep "model name" /proc/cpuinfo Output: model name : Intel(R) Xeon(TM) MP CPU 2.50GHz	[reply]
Re^2: How do I calculate the current CPU usage? by Anonymous Monk on Jun 21, 2007 at 05:27 UTC
I did not want to know the model name or supposed clock frequency. None of the numbers in /proc/cpuinfo give the current CPU usage.	[reply]