vmstat's cpu stats on first line of output are always the same
Hello,
I'm seeing this problem with vmstat, where the first line of output always has the same CPU statistics. For example:
Code:
neked@nekedmachine:~$ date && vmstat
Fri Jul 24 06:57:08 EDT 2009
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 0 130152 293444 23964 356264 0 0 13 125 0 2 7 7 82 4 0
neked@nekedmachine:~$ date && vmstat
Fri Jul 24 06:57:09 EDT 2009
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 0 130152 293444 23964 356264 0 0 13 125 0 2 7 7 82 4 0
neked@nekedmachine:~$ date && vmstat
Fri Jul 24 06:57:11 EDT 2009
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
2 0 130152 293352 23964 356264 0 0 13 125 0 2 7 7 82 4 0
neked@nekedmachine:~$ date && vmstat
Fri Jul 24 06:57:13 EDT 2009
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 0 130152 293368 23968 356276 0 0 13 125 0 2 7 7 82 4 0
As you can see, CPU statistics are always context switch=0, user=7, system=7, idle=82, I/O wait = 4.
You could see this problem (on my machine which is CentOS 5, and on another machine which Debian Lenny) by typing:
Code:
watch -n 1 vmstat
However, the problem goes away if you let vmstat update itself at intervals, i.e.:
But you can still see that the first line of vmstat's output above shows the same symptoms.
What explains this? How do I avoid it?
---------- Post updated at 07:32 AM ---------- Previous update was at 07:13 AM ----------
Uhhh... to answer my own inquiry, I should've RTFM. From vmstat's manpage:
Code:
The first report produced gives averages since the last reboot. Addi-
tional reports give information on a sampling period of length delay.
The process and memory reports are instantaneous in either case.
I'll leave this post up there as a cautionary tale for those who ask before doing proper research.
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