On 03/07/2011 06:05 PM, travel NJ wrote:
Hi,
I am in the process of converting a script for gathering system info in
Solaris to be used in Linux.
I noticed RedHat 5.5 does not have the "w" output from vmstat even the
manpage indicates that it exists
[sysadm@unix ~]$ vmstat 5 5
procs memory swap io system
cpu
r b swpd free buff cache si so bi bo in cs us sy id
wa
1 0 0 2492644 124640 1039360 0 0 0 0 0 0 0 1
0 0
1 0 0 2492644 124640 1039360 0 0 0 14 103 188 25 0
75 0
1 0 0 2492644 124640 1039360 0 0 0 0 102 191 25 0
75 0
1 0 0 2492644 124640 1039360 0 0 0 30 108 189 25 0
73 2
excerpt from man
FIELD DESCRIPTIONS
Procs
r: The number of processes waiting for run time.
b: The number of processes in uninterruptable sleep.
w: The number of processes swapped out but otherwise runnable. This
field is calculated, but Linux never desperation swaps.
In addition, it does not have the "sr" as similar to Solaris's vmstat. I do
know that many of the info are stalled in /proc, but is /proc/vmstat the
only location I can get the scanrate ? will it be pgscan_kswapd_high?
thanks
The vmstat manpage of RHEL 5.6 does NOT mention the w column. I have
checked it out:
FIELD DESCRIPTION FOR VM MODE
Procs
r: The number of processes waiting for run time.
b: The number of processes in uninterruptible sleep.
Memory
swpd: the amount of virtual memory used.
The w column on Unix land vmstat refers to the number of procs that are
runnable but swapped out of RAM. vmstat offers only the number of
bytes/kb/mb swapped.
Redhat recommends 'dstat' as a replacement for vmstat. Do a
yum -y install dstat
on your RHEL box and then play with something like:
dstat -vms
If I were you, I would concentrate on r, b and the free swapped space.
What matters is not so much how many procs are swapped but the rate of
forking, the b, r and the free swap that you have. This could give you
more meaningful stats in a cross-platform overloaded system monitoring
scenario
GM
--
--
George Magklaras
Senior Systems Engineer/IT Manager
Biotek Center, University of Oslo
EMBnet TMPC Chair
http://folk.uio.no/georgios
Tel: +47 22840535
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