FreeLists / oracle-l / RE: Managing CPU_COUNT for micro-partitioning on AIX

["Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>]

Here is what I see from vmstat and lparstat:

/opt/oracle ->vmstat 5 5

System configuration: lcpu=10 mem=16384MB ent=2.50

kthr    memory              page              faults              cpu
----- ----------- ------------------------ ------------
-----------------------
 r  b   avm   fre  re  pi  po  fr   sr  cy  in   sy  cs us sy id wa
pc    ec
 3  0 2775778 133383   0   0   0   0    0   0  63 104736 28367 32 10 58
0  1.28  51.0
 2  0 2776617 132525   0   0   0   0    0   0  85 119199 28103 36 11 52
0  1.42  56.9
 2  0 2776940 132202   0   0   0   0    0   0  79 103094 27445 29 11 60
0  1.22  48.9
 3  0 2776618 132523   0   0   0   0    0   0 1751 130567 29935 29 13 59
0  1.27  50.6
 2  0 2775679 133461   0   0   0   0    0   0 2116 108676 30768 28 14 57
0  1.32  52.7

Note the following:

lcpu=10
ent=2.5 - means I am entitled to 2.5 of the 4 physical CPUs, which are
being partitioned as 4 logical CPUs per physical CPU, but could be
partitioned as small as 10 logical CPUs per physical CPU.

Here are the definitions of "pc" and "ec" from the AIX manual:

pc - Number of physical processors consumed. Displayed only if the
partition is running with shared processor. 
ec - The percentage of entitled capacity consumed. Displayed only if the
partition is running with shared processor. 


Also - here is a new command I just found

/opt/oracle ->lparstat

System configuration: type=Shared mode=Uncapped smt=On lcpu=10 mem=16384
psize=4 ent=2.50

%user  %sys  %wait  %idle physc %entc  lbusy  vcsw phint
-----  ----  -----  ----- ----- ----- ------  ---- -----
  3.9   1.1    1.8   93.2  0.14   5.8    6.5  3454    28


/opt/oracle ->lparstat -i
Node Name                                  : ********
Partition Name                             : ********
Partition Number                           : 2
Type                                       : Shared-SMT
Mode                                       : Uncapped
Entitled Capacity                          : 2.50
Partition Group-ID                         : 32770
Shared Pool ID                             : 0
Online Virtual CPUs                        : 5
Maximum Virtual CPUs                       : 40
Minimum Virtual CPUs                       : 2
Online Memory                              : 16384 MB
Maximum Memory                             : 20480 MB
Minimum Memory                             : 12288 MB
Variable Capacity Weight                   : 128
Minimum Capacity                           : 2.00
Maximum Capacity                           : 4.00
Capacity Increment                         : 0.01
Maximum Physical CPUs in system            : 4
Active Physical CPUs in system             : 4
Active CPUs in Pool                        : 4
Unallocated Capacity                       : 0.00
Physical CPU Percentage                    : 50.00%
Unallocated Weight                         : 0


________________________________

From: Mark Brinsmead [mailto:pythianbrinsmead@xxxxxxxxx] 


CPU_COUNT increased from 8 to 10?  How "big" was the microLPAR to begin
with?


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