Is there a thread, pipeline and core relationship?

Question

Is there any relationship between these elements (thread, pipeline and core of the CPU)?

I saw that the pipeline helps a lot when you need to perform many tasks, thus making it easier to harness the processing power and can increase the gain of up to 4x more (comparing without the pipeline)

The segmentation of instructions is a hardware technique that allows the CPU perform the search for one or more instructions beyond the next to be executed - Wikipedia

Thread is the task a given program performs. Thread execution, also known as line or thread execution, is a way for a process to divide itself into two or more tasks which can be performed competitively. - Wikipedia

In computing, the kernel or kernel is the central component of the operation of most computers; it serves as a bridge between applications and actual data processing done at hardware level. - Wikipedia

After seeing this concept in computer architecture, I automatically ended up relating with threads and CPU core, however, I do not know if they are totally different things or if they have some connection.

If they have any relationship, what would they be?

Source - Page 27 - 28 (Increasing Pipeline Performance, Pipeline Limitations)

Answer 1

The question is (or was) a little vague, but I would say that there is no relation between these concepts, at least not with these terms.

Pipeline is something internal to the processor, generally you or your code do not need to know that it exists, how it works, or what will happen to it, is transparent and helps your code run faster for a matter of engineering the product you are using, is an implementation detail that helps you and that’s it, if you never hear anything about it it doesn’t change anything unless you’re doing something very low level that demands very high performance, but anyway you can’t manipulate it, at most create something that better explore the pipeline, in general only those who make a code generator for compiler or some very specific library need to know this.

Of course, the moment you study architecture will know this, it is a useful knowledge when it is not only decorate and can help make better decisions in certain scenarios of programming, but stops there what is useful to most people.

Core is a little important term outside the hardware area, for programming to all effects each core is a different processor. That term seems almost random there.

Thread is a concept of the operating system that can be exposed for its application and in general the hardware does not even have knowledge. It is a way to maintain a state of shared memory between processing lines. Some people might call this processing line pipeline, an equal term but that has nothing to do with the term used in computer architecture. The only relationship that thread has with core is that the fact that there is more than one is possible to make the same process have more than one execution line and so can use more than one core, although if you had multiple processors with only one core the same would happen, so talking about core here is circumstantial.

Incidentally thread can (but does not guarantee) let the response to an execution request happen before (some people rate it to be faster) because the processing (something broad) can happen at the same time.

Incidentally pipeline processor may (but does not guarantee) that some instructions that will be executed there (something specific) occur at the same time and this can respond faster than normal, which ends up being considered faster.

So they both get a similar gain in completely different forms. If it is this relationship you are looking for, then have it, both are completely distinct, unrelated things, which perform in very different ways, which are used for general purposes which can be considered the same (let the execution as quickly as possible)relationship is the ultimate purpose.

So they have a similar ratio to decrease the weight of a car or increase engine power or use a more sticky tire, it has nothing to do with each other, but they all make the car go faster if it does right.