[Hotplug_sig] sar doesn't show newly onlined CPUs

[bryce at osdl.org (Bryce Harrington)]

On Sun, Oct 08, 2006 at 03:40:56PM +0200, Sebastien Godard wrote:
> Bryce Harrington wrote:
> >On Sat, Oct 07, 2006 at 02:48:15PM +0200, Sebastien Godard wrote:
> >>No, this is not really intended behavior. In fact sar is just not 
> >>"hotplug CPU compliant" and has never been tested on such hardwares...
> >>Anyway I'm really interested to update it so that it can take into 
> >>account CPU that get off- or onlined on the fly. But I need to know how 
> >>files like /proc/stat for example are changed when a CPU is offlined or 
> >>onlined. I would appreciate to get some info about that.
> >
> To know exactly how things work, could you please do the following and 
> then send me the various snapshots you got:
> 0) CPU's 0 and 1 online.
> 1) Take snapshot #1 of /proc/stat file
> 2) Disable CPU 1
> 3) Take snapshot #2 of /proc/stat
> 4) Wait a few (2-3...) seconds
> 5) Take snapshot #3 of /proc/stat
> 6) Enable CPU 1
> 7) Take snapshot #4 of /proc/stat

I've done the above for two different systems for comparison.  The
capture script is also attached.
 
> Also could you tell me if there is a specific processor (for example CPU 
> 0) that can *never* be disabled?

No, but this is architecture dependent.  All systems prevent you from
offlining ALL cpus, but some (like em64t) restrict offlining cpu0, while
others (ppc64 for example) simply require that any one cpu remain
online, and do allow offlining cpu0.

Bryce


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cpu  15987 0 7310 44919511 7851 254 742 0
cpu0 2542 0 3912 11229028 3043 239 404 0
cpu1 3013 0 1610 11227020 4241 14 255 0
cpu2 3292 0 873 11233582 362 1 79 0
cpu3 7140 0 915 11229881 205 0 4 0
intr 45257083
ctxt 1573830
btime 1160293603
processes 102811
procs_running 1
procs_blocked 0
-------------- next part --------------
cpu  15993 0 7313 44919537 7851 254 742 0
cpu0 2544 0 3913 11229035 3043 239 404 0
cpu2 3296 0 873 11233588 362 1 79 0
cpu3 7140 0 917 11229889 205 0 4 0
intr 45257130
ctxt 1574055
btime 1160293603
processes 102845
procs_running 4
procs_blocked 0
-------------- next part --------------
cpu  15998 0 7314 44921799 7851 254 742 0
cpu0 2545 0 3913 11229790 3043 239 404 0
cpu2 3297 0 873 11234343 362 1 79 0
cpu3 7143 0 918 11230641 205 0 4 0
intr 45259431
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btime 1160293603
processes 102875
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procs_blocked 0
-------------- next part --------------
cpu  16006 0 7349 44924910 7854 254 742 0
cpu0 2547 0 3915 11230574 3046 239 404 0
cpu1 3016 0 1612 11227803 4241 14 255 0
cpu2 3298 0 875 11235132 362 1 79 0
cpu3 7145 0 947 11231401 205 0 4 0
intr 45262635
ctxt 1574851
btime 1160293603
processes 102941
procs_running 1
procs_blocked 0
-------------- next part --------------
cpu  3457 0 3614 8293102 710 33 175 0
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-------------- next part --------------
cpu  3457 0 3614 8293115 710 33 175 0
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#!/bin/sh -v

HOST=`hostname`

cp /proc/stat $HOST-stat-1.txt

echo 0 > /sys/devices/system/cpu/cpu1/online

cp /proc/stat $HOST-stat-2.txt

sleep 3

cp /proc/stat $HOST-stat-3.txt

echo 1 > /sys/devices/system/cpu/cpu1/online

cp /proc/stat $HOST-stat-4.txt

sleep 3

cp /proc/stat $HOST-stat-4.txt


echo $HOST