RE: Managing CPU_COUNT for micro-partitioning on AIX

From: Allen, Brandon <Brandon.Allen_at_OneNeck.com>
Date: Thu, 6 Jul 2006 10:15:58 -0700
Message-ID: <04DDF147ED3A0D42B48A48A18D574C45059E1A24@NT15.oneneck.corp>

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_at_gmail.com]

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

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Received on Thu Jul 06 2006 - 12:15:58 CDT