Not using all CPU's? Post: 302734583

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Operating Systems AIX Not using all CPU's? Post 302734583 by vpundit on Thursday 22nd of November 2012 11:33:40 AM

11-22-2012

Registered User

LPAR is not using all CPU's

Hi guys,

I am a bit confused here,

I have attached the nmon report extracted from one of my systems.

I've never seen something like this. It appears that all the cpu usage is being utilized on one CPU and the others appear to be idle or hardly used. I've seen this in a few systems recently. Now I know that their paging space is not setup correctly. and I'm going though the steps to show them that it needs to be changed. I have attached a simplified nmon log if someone can look at it and tell me if they can see why only one cpu is being utilized would be great as I've not seen this before.

Here is the lparstat

Code:

Partition Number                           : 4
Type                                       : Shared-SMT-4
Mode                                       : Capped
Entitled Capacity                          : 4.00
Partition Group-ID                         : 32772
Shared Pool ID                             : 0
Online Virtual CPUs                        : 40
Maximum Virtual CPUs                       : 60
Minimum Virtual CPUs                       : 1
Online Memory                              : 65536 MB
Maximum Memory                             : 131072 MB
Minimum Memory                             : 4096 MB
Variable Capacity Weight                   : 0
Minimum Capacity                           : 0.10
Maximum Capacity                           : 6.00
Capacity Increment                         : 0.01
Maximum Physical CPUs in system            : 16
Active Physical CPUs in system             : 16
Active CPUs in Pool                        : 16
Shared Physical CPUs in system             : 16
Maximum Capacity of Pool                   : 1600
Entitled Capacity of Pool                  : 1500
Unallocated Capacity                       : 0.00
Physical CPU Percentage                    : 10.00%
Unallocated Weight                         : 0
Memory Mode                                : Dedicated
Total I/O Memory Entitlement               : -
Variable Memory Capacity Weight            : -
Memory Pool ID                             : -
Physical Memory in the Pool                : -
Hypervisor Page Size                       : -
Unallocated Variable Memory Capacity Weight: -
Unallocated I/O Memory entitlement         : -
Memory Group ID of LPAR                    : -
Desired Virtual CPUs                       : 40
Desired Memory                             : 65536 MB
Desired Variable Capacity Weight           : 0
Desired Capacity                           : 4.00
Target Memory Expansion Factor             : -
Target Memory Expansion Size               : -
Power Saving Mode                          : Disabled

During that day here was the nmon uptime:

Code:

    12:04AM   up 2 days, 9 hrs,  0 users,    load average: 39.55, 42.90, 44.14

Last edited by vpundit; 11-23-2012 at 01:38 PM..

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LEARN ABOUT OPENSOLARIS

mman

mman.h(3HEAD)							      Headers							     mman.h(3HEAD)

NAME

       mman.h, mman - memory management declarations

SYNOPSIS

       #include <sys/mman.h>

DESCRIPTION

       The <sys/mman.h> header supports the following options:

	   o	  the Memory Mapped Files option

	   o	  the Shared Memory Objects option

	   o	  the Process Memory Locking option

	   o	  the Memory Protection option

	   o	  the Synchronized Input and Output option

       For Memory Mapped Files and Shared Memory Objects options, the following protection options are defined:

       PROT_READ     Page can be read.

       PROT_WRITE    Page can be written.

       PROT_EXEC     Page can be executed.

       PROT_NONE     Page cannot be accessed.

       The following flag options are defined:

       MAP_SHARED     Share changes.

       MAP_PRIVATE    Changes are private.

       MAP_FIXED      Interpret addr exactly.

       The flags immediately following are defined for msync(). See msync(3C).

       MS_ASYNC 	Perform asynchronous writes.

       MS_SYNC		Perform synchronous writes.

       MS_INVALIDATE	Invalidate mappings.

       The symbolic constants immediately following are defined for the mlockall() function. See mlockall(3C).

       MCL_CURRENT    Lock currently mapped pages.

       MCL_FUTURE     Lock pages that become mapped.

       The symbolic constant MAP_FAILED is defined to indicate a failure from the mmap() function. See mmap(2).

       The mode_t, off_t, and size_t types are be defined as described in <sys/types.h>. See types(3HEAD).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mmap(2), mprotect(2), munmap(2), madvise(3C), mlock(3C), mlockall(3C), msync(3C), shm_open(3C), shm_unlink(3C), attributes(5), standards(5)

SunOS 5.11							    5 Feb 2008							     mman.h(3HEAD)

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