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Threads and cores?

post #1 of 11
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Well i'm kind of confused on this subject. How do each work exactly? Are there more than 1 thread when you run a process? Does each core only have 1 thread. Is that why when you have hyperthreading(eg 2600k) you have 4 real cores and 4 virtual ones because each thread is a core?
post #2 of 11
core = PHYSICAL CORE

thread = VIRTUAL "CORE"

AMD Phenoms are Quad Cores, Quad Threads, No hyperthreading.

Intel i7s are Quad cores, Octo-Thread, with hyperthreading.

Hyperthreading means that there are two threads per each physical core.

Which means my i3 w/ hyperthreading means 2 cores, 4 threads.


Basically means your computer sees more threads when you are running processes, meaning the CPU can "do" more at one time. It makes it "better" for multitasking.
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post #3 of 11
2600k have 8 virtual cores, but only 4 real. If you are a gamer, the 2500k is the way to go
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post #4 of 11
Where does the 'computing take place' since the cores don't actually exist(virtual)?

Also what is the performance compared to a physical core.I know its not equal,but what percentage?
    
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post #5 of 11
Quote:
Originally Posted by otaku_ex View Post
2600k have 8 virtual cores, but only 4 real. If you are a gamer, the 2500k is the way to go
more cores does not make games run better, higher clocks and faster memory is way better.

there was some thread where some dude compared a i7 with and without hyperthreading on, and there was ZERO appreciative difference.

though, since the 2500K is a godly overclocker, you still are right. lol

Quote:
Originally Posted by TronRR View Post
Where does the 'computing take place' since the cores don't actually exist(virtual)?

Also what is the performance compared to a physical core.I know its not equal,but what percentage?
each core basically does one thread of work, every other clock. I think ive heard you get only a little performance boost w/ HT on, it just helps a LOT when youre doing heavy processing, because it allows the cores to be much more efficient.

and the CPU does all the thinking for the HT, the computer just sees 8 threads, it doesnt care which are on which cores.
Edited by Fooxz - 5/4/11 at 7:55pm
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post #6 of 11
Quote:
Originally Posted by TronRR View Post
Where does the 'computing take place' since the cores don't actually exist(virtual)?

Also what is the performance compared to a physical core.I know its not equal,but what percentage?
That's a loaded question. Just think of it as being able to juggle 3 things at once versus 4 (except here the numbers are 1 and 2).

The answer to your second question depends heavily on the application. I don't know of a cut-and-clean way of describing it as a numerical value.
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post #7 of 11
I've tried to get a legitimate response from Intel workers, friends of my parents who work in Intel, etc, about what HT really is and how it works and all I get is the generic response. Then they tell me that they can't reveal that info in any greater depth.

I wonder why... >_> AMD would LOVE to get their hands on that...
     
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post #8 of 11
Cores are physical CPU units, threads are what programs send to the CPU to get processed.

Since not all threads use every part of a CPU core at once, hyperthreading allows the CPU to start to process a second thread with the part of that CPU core that isn't being used. It appears to the PC as another core, since that's the easiest way to get an additional thread sent to it.
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post #9 of 11
All the responses about terminology with very little substance.

It will arrive shortly....
    
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post #10 of 11
Thread is the smallest work unit of a program.
A core represents a CPU instance that can do work.

Virtual cores uses intelligent thread schedulers and sometimes partially duplicated cores. Hyperthreading costs something like 5-10% additional die space but can provide something like 30-50% performance boost in certain workloads. A core is actually made up of a series of processing steps (pipeline). Certain threads need more work in one than other... so the thread manager swaps them around to increase efficiency of the pipeline.

Intel, AMD, IBM, Sun, etc all implement virtual cores differently. I believe Sun newest SPARC CPUs create 4 virtual cores from one physical core.
Edited by DuckieHo - 5/4/11 at 8:18pm
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