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Full Discussion: Newbie & LPAR
Operating Systems AIX Newbie & LPAR Post 302492765 by Talulah on Wednesday 2nd of February 2011 12:28:13 AM
Old 02-02-2011
Newbie & LPAR

Hello,

what is the meaning of:


Code:
lparstat -i
Node Name : ****
Partition Name : ****
Partition Number : 1
Type : Shared-SMT
Mode : Capped
Entitled Capacity : 2.00
Partition Group-ID : 32769
Shared Pool ID : 0
Online Virtual CPUs : 4
Maximum Virtual CPUs : 4
Minimum Virtual CPUs : 2
Online Memory : 16384 MB
Maximum Memory : 20480 MB
Minimum Memory : 8192 MB
Variable Capacity Weight : 0
Minimum Capacity : 1.00
Maximum Capacity : 4.00
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 : 1400
Unallocated Capacity : 0.00
Physical CPU Percentage : 50.00%
Unallocated Weight : 0
Desired Virtual CPUs : 4
Desired Memory : 16384 MB
Desired Variable Capacity Weight : 0
Desired Capacity : 2.00

I see 8 "CPU"(Cores) in topas. Is every topas-CPU limited to 25% of one physical core? Or if only one topas-CPU is used, could it gain 100% from one physical Core?

Thx
Talulah

---------- Post updated 02-02-11 at 06:28 AM ---------- Previous update was 01-02-11 at 05:46 PM ----------

Additional question:
Code:
lparstat -i: 4 Online Virtual CPUs

Why are there eight CPUs in topas?

Last edited by pludi; 02-01-2011 at 12:52 PM.. Reason: code tags, please...
 

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CHCPU(8)						       System Administration							  CHCPU(8)

NAME
chcpu - configure CPUs SYNOPSIS
chcpu -c|-d|-e|-g cpu-list chcpu -p mode chcpu -r|-h|-V DESCRIPTION
chcpu can modify the state of CPUs. It can enable or disable CPUs, scan for new CPUs, change the CPU dispatching mode of the underlying hypervisor, and request CPUs from the hypervisor (configure) or return CPUs to the hypervisor (deconfigure). Some options have a cpu-list argument. Use this argument to specify a comma-separated list of CPUs. The list can contain individual CPU addresses or ranges of addresses. For example, 0,5,7,9-11 makes the command applicable to the CPUs with the addresses 0, 5, 7, 9, 10, and 11. OPTIONS
-c, --configure cpu-list Configure the specified CPUs. Configuring a CPU means that the hypervisor takes a CPU from the CPU pool and assigns it to the vir- tual hardware on which your kernel runs. -d, --disable cpu-list Disable the specified CPUs. Disabling a CPU means that the kernel sets it offline. -e, --enable cpu-list Enable the specified CPUs. Enabling a CPU means that the kernel sets it online. A CPU must be configured, see -c, before it can be enabled. -g, --deconfigure cpu-list Deconfigure the specified CPUs. Deconfiguring a CPU means that the hypervisor removes the CPU from the virtual hardware on which the Linux instance runs and returns it to the CPU pool. A CPU must be offline, see -d, before it can be deconfigured. -p, --dispatch mode Set the CPU dispatching mode (polarization). This option has an effect only if your hardware architecture and hypervisor support CPU polarization. Available modes are: horizontal The workload is spread across all available CPUs. vertical The workload is concentrated on few CPUs. -r, --rescan Trigger a rescan of CPUs. After a rescan, the Linux kernel recognizes the new CPUs. Use this option on systems that do not auto- matically detect newly attached CPUs. -V, --version Display version information and exit. -h, --help Display help text and exit. RETURN CODES
chcpu has the following return codes: 0 success 1 failure 64 partial success AUTHOR
Heiko Carstens <heiko.carstens@de.ibm.com> COPYRIGHT
Copyright IBM Corp. 2011 SEE ALSO
lscpu(1) AVAILABILITY
The chcpu command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils /util-linux/>. util-linux July 2014 CHCPU(8)
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