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From: Michal Cihar <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: top: %CPU sum is sometimes more than 100
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Package: procps
Version: 1:3.1.15-3
Severity: normal
Sum of CPU percentage per process is sometimes more than 100% on single CPU
system:
top - 21:39:15 up 26 min, 3 users, load average: 1.04, 0.97, 0.78
Tasks: 77 total, 3 running, 74 sleeping, 0 stopped, 0 zombie
Cpu(s): 66.7% us, 33.3% sy, 0.0% ni, 0.0% id, 0.0% wa, 0.0% hi, 0.0% si
Mem: 515136k total, 426224k used, 88912k free, 34360k buffers
Swap: 1951888k total, 0k used, 1951888k free, 223360k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6897 root 25 0 25220 21m 3556 R 57.7 4.2 8:03.21 dpkg
14933 root 16 0 2076 1028 1872 R 57.7 0.2 0:06.11 top
[...]
-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 2.6.0-nijel2
Locale: LANG=C, LC_CTYPE=cs_CZ
Versions of packages procps depends on:
ii libc6 2.3.2.ds1-11 GNU C Library: Shared libraries an
ii libncurses5 5.3.20030719-5 Shared libraries for terminal hand
-- no debconf information
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Date: Mon, 18 Jul 2005 08:29:24 +1000
To: Ryan Lovett <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
Subject: Re: Bug#234439: top: %CPU sum is sometimes more than 100
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From: [EMAIL PROTECTED] (Craig Small)
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On Thu, Jul 14, 2005 at 02:25:49PM -0700, Ryan Lovett wrote:
> I see this as well:
>
> $ /bin/ps haxo pcpu | awk '{ s += $0 } END { print s }'
> 403.5
>
> on a machine with 4 cpus.
The manual page explains this can happen.
%cpu %CPU cpu utilization of the process in "##.#" format.
Currently, it is the CPU time used divided by the time
the process has been running (cputime/realtime ratio),
expressed as a percentage. It will not add up to 100%
unless you are lucky. (alias pcpu).
I believe it is caused by the precision of the numbers found in the
kernel are not good enough for getting it any more accurate. In any
case there's noting procps can do about it.
- Craig
--
Craig Small GnuPG:1C1B D893 1418 2AF4 45EE 95CB C76C E5AC 12CA DFA5
Eye-Net Consulting http://www.enc.com.au/ MIEE Debian developer
csmall at : enc.com.au ieee.org debian.org
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