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What does CPU Usage History Box In Task Mgmt shows?

Posted on 2010-08-15
Medium Priority
Last Modified: 2013-12-13
Hi EEs,

I have one IBM Server in which 2 processors are running & 25 xp client computers with PIV processes.

* In Server's Task Mgmt i can see 4 boxes for CPU usage history & in other PCs i can see 2 box for CPU Usage history under performance tab...why?

* What is PF Usage in performance tab?
* What does Physical Memory (Total, Available & System Cache) represents?
* What is Kernel Memory show like Total, Paged & Nonpaged?
* What is the means of those figure's shown under  I/O read & I/O write in Processes tab or task manager?

For your refe. i am here with attaching the snap of my query as well.

I Appolonia if I asked too many questions in under one, but its all are co-related to Task Manager over-all.

an earlier reply will be highly appreciated,

many thanks,


Question by:dxbdxb2009
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LVL 70

Accepted Solution

garycase earned 2000 total points
ID: 33441033
The CPU history is simply showing you the recent history of CPU utilization percentages for each of your four CPU cores.     On systems where you see two of these you only have two CPU cores.

PF usages shows you how much page file you're using.

The memory stats are as labeled (total, available, cache), and the kernel memory shows how much memory the operating system core is using.

Author Comment

ID: 33441173
My question was-------how many boxes i will see under CPU Usage History if I have two CPUs (Xeon) in Performance & how much for one CPU (PIV)

In Kernel total is representing the total available memory or the total used memory? Ps explain.

awaiting for your earlier reply,

many thanks.

LVL 70

Assisted Solution

garycase earned 2000 total points
ID: 33441218
You'll see one box for each Core of the CPU.    Note that if you're using hyperthreaded CPU's the hyperthreaded core will show as two "cores."

So a single dual-core non-hyperthreaded CPU will show two boxes;   a single quad-core non-hyperthreaded core will show four boxes;   a single hyper-threaded quad-core will show eight boxes;  etc.       So if, for example, you had a dual-CPU box using two hex-core hyperthreaded Xeons you'd see twenty-four boxes :-)

The kernel memory shows how much virtual memory is allocated for the OS core -- including what's actually resident in real RAM and what's been paged out.
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Author Comment

ID: 33441282
Now here some terms i request you to make me understand in dept:-

* Hyperthreaded & non Hyperthreaded CPU
* Single Dual-core non hyperthreaded
* hex-core hyperthreaded

Does kernel memory is same which we set in Virtual Memory under Performance Option in system property's advanced button?

One more thing :- If i have one GB physically installed in XP sp3 what figure i need to set for Virtual Memory.....like currently i have set as below:-

Total physical memory = 1 GB
Custom Size :
Initial Size (MB) : 1536
Maximum Size(MB) : 3072

Kindly advice the right figure & explain my queries asked above.

many thanks in advice,

LVL 70

Assisted Solution

garycase earned 2000 total points
ID: 33441628
Hyperthreaded processors have two complete sets of internal registers that allow very simple hardware-based switching that allows more effective use of CPU resources.     They "look" like two processors to an operating system -- so a single hyperthreaded CPU will show two boxes in Device Manager's processor display.   You can read more details here:  http://en.wikipedia.org/wiki/Hyper-threading

A dual-core CPU simply has two actual CPU cores.   non-hyperthreaded simply means exactly that.

A Hex-core CPU has six cores.    If it's hyperthreaded, it will "look" like twelve cores to the operating system.     The current top-of-the-line Xeons have six cores and are hyperthreaded, so they'll look like twelve CPUs to an operating system (thus you'll see twelve boxes in Device Manager).     If you put two of these in a dual-CPU motherboard, you'll have twelve real cores, but twenty-four apparent cores due to hyper-threading.

Your virtual memory settings are fine, although the max is a bit high for only 1GB of real memory.    I'd set the min and max the same at about 2560MB.

Author Comment

ID: 33494088
Kindly advice if i have 2 GB RAM then what racio i have to put if i also want to equal as a min & max setting for virtual memo?
Pls explain why we keep this equal?
LVL 70

Expert Comment

ID: 33494116
The general rule-of-thumb is to use a maximum of 1.5x the actual memory ... so if you have 2GB RAM you should set the maximum size to 3GB.    The reason many folks like to set the min and max the same is so the page file will always be the same size -- there won't be any shrinking/growing of the file, so it won't become fragmented over time.

Author Comment

ID: 33611254
Kidly advice What is the best to set....whether Programs or Background Services under Processor Scheduling & Programs or System Cache under Memory Usage in the Advanced Tab if I am using XP SP3 & Windows Server 2k3.

awaiting for your earlier reply....

many thanks


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