Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: CPU vs Core(s)?

14 Nov 2011   #1
markg2

Windows 7
 
 
CPU vs Core(s)?

This may be somewhat far afield but--

I have a desktop gadget that measures CPU, Core and RAM % usage. It was my understanding that the CPU cores are the processing engines within the structure of the CPU. So I'm surprised to see that the Core 1 + Core 2 % at any given time is no where near the total value of CPU usage %.

I tried Googling and reading but I'm not finding this specific question/answer.

Even though this is not really directed at this forum's target, would someone mind offering up a quick explanation?

Thanks,

Mark


My System SpecsSystem Spec
.
14 Nov 2011   #2
mickey megabyte

ultimate 64 sp1
 
 

can you give us an example of your readings?

imagine a dual-core processor, and core 1 is being used 60%, and core 2 is 40% - then the average use is 50% for the whole cpu.

does this make sense?
My System SpecsSystem Spec
14 Nov 2011   #3
markg2

Windows 7
 
 

If the object were to determine the average usage, then yes.

However, if the object is to determine the total usage at the moment of the CPU then why wouldn't the answer be to add core 1 + core 2 and have that % be the same as the cpu usage %--which it never is according to my desktop gadget?
My System SpecsSystem Spec
.

14 Nov 2011   #4
badger906

Windows 7 Ultimate x64, & Mac OS X 10.9.2
 
 

But then if both cores were at 50% the cpu readout would say 100%?
Which would be miss leading.



My System SpecsSystem Spec
14 Nov 2011   #5
markg2

Windows 7
 
 

Okay, then what is the relationship between total cpu usage and % core usage?
My System SpecsSystem Spec
14 Nov 2011   #6
DeaconFrost

Windows 7 Ultimate x64 SP1
 
 

It sounds like you are wandering off on a topic that isn't going to be very beneficial. There's no real relationship between the two. If you consider a dual core CPU, you essentially have two "brains" to do the calculations. They are somewhat independent, in that the total usage doesn't need to always add to 100%. If you had a single core, it wouldn't be 100% all the time, either. If one core is working on a task at 30%, the other core could sit idle, or it could be working on a separate task at 30%, 45%, etc...whatever.

That's the entire point behind multiple core CPUs...is to divide the workload up.
My System SpecsSystem Spec
14 Nov 2011   #7
badger906

Windows 7 Ultimate x64, & Mac OS X 10.9.2
 
 

If you want a rough idea of the "total" percentage open task manager then minimise it.

The graph that shows up in the task bar is accurate enough.

My System SpecsSystem Spec
14 Nov 2011   #8
mickey megabyte

ultimate 64 sp1
 
 

Quote   Quote: Originally Posted by markg2 View Post
Okay, then what is the relationship between total cpu usage and % core usage?
total cpu usage = average of individual core usage

as badger906 said above, if both cores of a dual-core cpu were running at 50%, total cpu usage is 50% too - the cpu still has capacity to do the same workload again.

also if core 1 was 100% and core 2 was 0%, then the total usage would be 50% too...same as 75/25, 60/40 etc etc

it might help if you imagined you had two factories with 100 people employed in each one.

in factory A, 60 people are working hard, whilst 40 are slacking off looking at facebook. in factory B, 40 are working, 60 are picking their nose. so out of the total workforce in both factories, only 50% are working.
My System SpecsSystem Spec
14 Nov 2011   #9
bartekxx12

Windows 7 Ultimate 64bit
 
 

Total CPU Usage for dual cores = (Core 1 + Core 2 usage) Divided by 2

And for all CPU's = (Sum of Usage of all cores) Divided by number of cores

Correct me if I'm wrong just tried to work it out here, but there is your relationship...
My System SpecsSystem Spec
14 Nov 2011   #10
bartekxx12

Windows 7 Ultimate 64bit
 
 

Well that seems to work...

Core 1 : 20%
Core 2 : 27%
Total CPU Usage : 20+26= 46 /2 = 23%

Example 2 :

Core 1 : 16%
Core 2 : 50%
Core 3 : 24%
Core 4 : 68%

Total CPU Usage = 16+50+24+68 = 158 / 4 = 39.5% so rounded 40%

Example 3 : (Simplified)

Core 1 : 24%

Total CPU Usage = 24 /1 = 24%
My System SpecsSystem Spec
Reply

 CPU vs Core(s)?




Thread Tools Search this Thread
Search this Thread:

Advanced Search




Similar help and support threads
Thread Forum
Intel introduces nine new Core i5, Core i7 Haswell mobile processors
Read more at: Intel introduces nine new Core i5, Core i7 Haswell mobile processors | ZDNet and Intel refreshes Core i5 and Core i7 mobile lineups
News
Is this good gaming? Intel Core i5-2400S Quad-Core Processor 2.5 GHz 4
Here's a link to what I'm thinking about buying. I've never messed with these "barebones" PCs before. What exactly will I need for it to run games like BF3. Thanks, sorry if I'm being vague, I really don't know too much about this area of PC Intel Core i5 2400S Quad Core Processor 2 5 GHz 4 GB...
Gaming
Wondering about upgrading from dual core to quad core CPU with Win 7
I am just wondering about the CPU I just ordered from E-Bay new and how it will perform with Windows 7 64 Bit compaired to the one I have now this is the one I ordered: AMD Phenom X4 Quad CPU 9500 AM2+ 2.2 GHz 3600MHz 4MB :D This is the one I have now: AMD Athlon 64 X2 Dual core 3800+ 2GHz I...
Hardware & Devices
Intel Gives Core i3, Core i5 Dual-Core Processors K0 Stepping Update
more..
News
Intel cuts Core i7 950 price in half, adds new Core i3
very interesting read if you are thinking of upgrading your processor:D Intel cuts Core i7 950 price in half, adds new Core i3 - TechSpot News
News
AMD Turion X2 Dual-Core RM-75 VS Intel Core 2 Duo T6600
Since I couldn't get specs on the AMD Turion in terms of cache, etc. (the Intel one in the title is 2M Cache, 2.20 GHz, 800 MHz FSB) I couldn't figure out which is the better processor. Does anyone know? Is there also a website I can reference that can compare them?
Hardware & Devices


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 07:42.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App