What is Entitlement capacity in AIX?

Once a micro partition is activated, processing capacity is usually referred to as entitled capacity. This entitled capacity is reserved for that partition when it is started. The total entitled capacity of all the partitions configured on the system can never exceed the number of processors in that system.

What is entitled CPU?

It is the portion of physical processor resource assigned to the SPLPAR partition. The minimum processor entitlement is 0.1 CPU or 10 percent processing capacity of CPU. The number of partitions on the machine and the number of physical processors in the shared pool define entitlement value.

How do I tell how many CPUs my AIX has?

Re: How to get Physical processor count on AIX See the output of the prtconf command. The ‘number of processors’ gives you the actual number of physical CPUs installed and active. You have 12 cores active and 3 CPUs, so each CPU has 4 cores.

What is logical CPU in AIX?

Logical processor Represents an individual Simultaneous Multi-threading SMT thread of a physical processor. Equals the total number of cores assigned multiplied by SMT: lcpu = vCPU * SMT. Hypervisor virtual processor core corresponds to one AIX logical processor when SMT is disabled.

What is EC in AIX?

EC: Entitled Capacity. VP/Core ratio in the pool: The sum of VPs in the pool / Cores in the pool –> should be around 2 (or less). Higher the ratio, less uncapped capacity is available.

What is virtual CPU in AIX?

A virtual processor is a representation of a physical processor core to the operating system of a partition that uses shared processors. It is the number of physical processors that the logical partition can spread out across. It represents the upper threshold for the number of physical processors that can be used.

How do I check memory on AIX?

On AIX you can use a combination of the commands lsdev and lsattr to determine how much memory the computer has. These commands (located in /usr/sbin) are used to display the system devices and their attributes.

What is SMT in AIX?

This mode can be enabled or disabled for all processors either immediately or on subsequent boots of the system. This command controls the simultaneous multithreading options. Each individual Simultaneous Multi-threading (SMT) thread of a physical processor core is treated as an independent logical processor by AIX®.

How many cores does a vCPU have?

A general estimation is that 1 vCPU = 1 Physical CPU Core.

What is the difference between logical CPU and virtual CPU?

A logical processor is the number of the processor’s cores multiplied by the number of threads per core. vCPUs are actually the amounts of of time a virtual machine gets on a logical processor.

How do I check memory issues in AIX?

The first step in diagnosing a memory leak is to recognize that you are experiencing a leak. Monitor process memory usage with ‘svmon -P -O summary=basic,unit=MB’ to display memory usage of all processes, and make note of any processes that might be using an unexpected amount of memory.

What is computational memory in AIX?

Memory in AIX is managed by VMM, Virtual Memory Manager, that works with pages, a fixed-size block of data. There are fundamentally two types of pages on AIX: Working storage pages (Computational memory) Permanent storage pages (Non-Computational memory)

What is paging space in AIX?

AIX® uses virtual memory to address more memory than is physically available in the system. The management of memory pages in RAM or on disk is handled by the Virtual Memory Manager (VMM). Virtual-memory segments are partitioned in units called pages.

How do I enable SMT?

Enabling AMD Simultaneous Multithreading (SMT)

1. From the System Utilities screen, select System Configuration > BIOS/Platform Configuration (RBSU) > Processor Options > AMD SMT Option.
2. Select one of the following: Enabled—Each physical processor core operates as two logical processor cores.
3. Save your setting.

How do I check memory size on AIX?

How do I free up memory on AIX?

There is no free -m under it. Your AIX server won’t have any free memory. It will have memory in use by applications and memory in use for filesystem cache. If you look at tools like topas, nmon, etc.

How do I check paging space utilization in AIX?

HowTo: Check Swap Usage In IBM Aix Unix

1. lsps Command. Use this command to see the characteristics of a paging space: # lsps -a.
2. svmon Command. Use this command to captures and analyzes a snapshot of virtual memory: # svmon.
3. Other commands. You can also use the following commands: # vmstat 1 5. # vmstat 10 10.

How to list presently staged/installed CPU and hard disk capacity in Aix?

To list presently staged/installed cpu,memory and hard-disk capacity in the server , use below simple commands on the aix server. Below two commands, show what is available for processing. Means if the rmss is in place.

How do I calculate the number of Aix logical processors?

Equals the total number of cores assigned multiplied by SMT: lcpu = vCPU * SMT Hypervisor virtual processor core corresponds to one AIX logical processor when SMT is disabled. Use the command #lparstat to check number of logical processors.

Can a partition use more than the assigned capacity entitlement?

The partition can use more than the assigned capacity entitlement (Uncapped mode). Capped and uncapped modes details will be illustrated later in this document. The number of virtual processors and processing units that are assigned to a partition can be changed through the HMC.

How to check the number of logical processors in Linux?

Use the command #lparstat to check number of logical processors. Number of lcpus configured should be evaluated against the number of process threads on the run queue Some threads on the run queue may be waiting for an available logical cpu. Additional virtual processors might be needed if there are threads on the run queue waiting for lcpu.