registers question
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Just to add to the context switching answer... The thing to remember is the CPU can only do one thing at once... just really really fast. Running two apps at once or two threads in an app at once is simply a software construct in things like the Windows subsystem. Hardware doesn't care.
Jeremy Falcon
Jeremy Falcon wrote:
The thing to remember is the CPU can only do one thing at once...
Erm...not quite. Each core is an "independent" processor which is part of the CPU - and two or more cores can be doing different things at the same time.
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952) Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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Jeremy Falcon wrote:
The thing to remember is the CPU can only do one thing at once...
Erm...not quite. Each core is an "independent" processor which is part of the CPU - and two or more cores can be doing different things at the same time.
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952) Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
OriginalGriff wrote:
Erm...not quite. Each core is an "independent" processor which is part of the CPU - and two or more cores can be doing different things at the same time.
OP asked in the context of a machine with one [single core?] CPU. ... not that we should be discussing this kind of thing in the Lounge.
I'm retired. There's a nap for that... - Harvey
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Jeremy Falcon wrote:
The thing to remember is the CPU can only do one thing at once...
Erm...not quite. Each core is an "independent" processor which is part of the CPU - and two or more cores can be doing different things at the same time.
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952) Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
He was talking about a single core CPU.
Jeremy Falcon
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You are in the wrong place! We sold all our EIP's for food...
I'm not questioning your powers of observation; I'm merely remarking upon the paradox of asking a masked man who he is. (V)
Bacon to be more precise :-D
With friendly greetings,:) Eric Goedhart
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What are you doing here? Shouldn't you be off doing something like, well... emoting?
Still a programmer by day, not forever, but for now.
Jeremy Falcon
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OriginalGriff wrote:
Erm...not quite. Each core is an "independent" processor which is part of the CPU - and two or more cores can be doing different things at the same time.
OP asked in the context of a machine with one [single core?] CPU. ... not that we should be discussing this kind of thing in the Lounge.
I'm retired. There's a nap for that... - Harvey
H.Brydon wrote:
... not that we should be discussing this kind of thing in the Lounge.
Seeing that I have't been on CP in like, a decade, what happened to stuff like voting on posts?
Jeremy Falcon
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harold aptroot wrote:
So why is this even a question?
Not everyone understands how a multi-tasking operating system works. Certainly plenty of "developers" in Q&A would seem not to.
Richard MacCutchan wrote:
"developers" in Q&A
A rare beast...
I'm not questioning your powers of observation; I'm merely remarking upon the paradox of asking a masked man who he is. (V)
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H.Brydon wrote:
... not that we should be discussing this kind of thing in the Lounge.
Seeing that I have't been on CP in like, a decade, what happened to stuff like voting on posts?
Jeremy Falcon
The voting toy was taken away from the children until they learn how to behave like grownups :D
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Jeremy Falcon wrote:
The thing to remember is the CPU can only do one thing at once...
Erm...not quite. Each core is an "independent" processor which is part of the CPU - and two or more cores can be doing different things at the same time.
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952) Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
I think the term CPU is somewhat antiquated, from the days when you did have a central processing unit. Now we have lots of them and they are known as cores. In my mind CPU = Core, although I can see how it might not mean that to other people.
Regards, Rob Philpott.
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The voting toy was taken away from the children until they learn how to behave like grownups :D
So...it won't be coming back then? :laugh:
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952) Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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The voting toy was taken away from the children until they learn how to behave like grownups :D
There are no grown ups, just us wabbits! ;P
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The voting toy was taken away from the children until they learn how to behave like grownups :D
Ah. Makes sense actually.
Jeremy Falcon
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Suppose we run two programs on a single-core processor First sets the EIP pointer to 2 (example)and the second one sets it to 1 How does the first program know it will continue from adress 2 and not 1 ? Thank you very much (random fact: Pink Floyd's wish you were here was written not for someone who died ,but for an ex member who went insane)
EbolaHost wrote:
How does the first program know it will continue from adress 2 and not 1 ?
It doesn't until the quantum state in collapsed by an observer. Marc
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Random random fact: While recording Wish You Were Here, the same former member wandered into the recording and none of the band recognised him.
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EbolaHost wrote:
(random fact: Pink Floyd's wish you were here was written not for someone who died ,but for an ex member who went insane)
Syd Barrett[^] was the driving force and one of the original members of Pink Floyd. He released 2 solo albums; The Mapcap Laughs and Barrett but they didn't go very well. I have The Mapcap Laughs and it is a very strange album.
Along with Antimatter and Dark Matter they've discovered the existence of Doesn't Matter which appears to have no effect on the universe whatsoever! Rich Tennant 5th Wave
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FALSE One of them did I think it was Waters He asked him what does he think of the album and he replied...well i dont exactly remember but it was something negative !
Sorry to correct you - albeit slightly - but I was referring to the initial entry of Barrett. In a later interview, Richard Wright said: "One thing that really stands out in my mind, that I’ll never forget; I was going in to the the Shine On sessions. I went in the studio and I saw this guy sitting at the back of the studio, he was only as far away as you are from me. And I didn’t recognise him. I said, ‘Who’s that guy behind you?’ ‘That’s Syd.’ And I just cracked up, I couldn’t believe it… he had shaven all his hair off… I mean, his eyebrows, everything… he was jumping up and down brushing his teeth, it was awful. And, uh, I was in, I mean Roger was in tears, I think I was; we were both in tears. It was very shocking… seven years of no contact and then to walk in while we’re actually doing that particular track. I don’t know – coincidence, karma, fate, who knows? But it was very, very, very powerful.” Waters described the meeting as: “I had no idea who he was for a very long time.”
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I think the term CPU is somewhat antiquated, from the days when you did have a central processing unit. Now we have lots of them and they are known as cores. In my mind CPU = Core, although I can see how it might not mean that to other people.
Regards, Rob Philpott.
Rob Philpott wrote:
I think the term CPU is somewhat antiquated, from the days when you did have a central processing unit. Now we have lots of them and they are known as cores.
In my observation, your usage of "core" isn't quite right. My understanding is that a machine can have multiple CPUs and a CPU can have multiple cores. What distinguishes a core from a CPU is use of common cache, and ability to synchronize a subset of memory operations. A room full of compute servers is not a single CPU. In 2007, I purchased a machine that contained 2 dual core CPUs. To be fair, this is still vague and the terminology needs some polishing.
I'm retired. There's a nap for that... - Harvey
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Rob Philpott wrote:
I think the term CPU is somewhat antiquated, from the days when you did have a central processing unit. Now we have lots of them and they are known as cores.
In my observation, your usage of "core" isn't quite right. My understanding is that a machine can have multiple CPUs and a CPU can have multiple cores. What distinguishes a core from a CPU is use of common cache, and ability to synchronize a subset of memory operations. A room full of compute servers is not a single CPU. In 2007, I purchased a machine that contained 2 dual core CPUs. To be fair, this is still vague and the terminology needs some polishing.
I'm retired. There's a nap for that... - Harvey
I wouldn't argue with that, but I think it hangs on interpretation. I tend not to use the term CPU any more, rather just 'processor'. 2 Processors with 4 cores each. For me, having two CPUs doesn't sound right as they can't both be central (arguably...) and I think the term belongs in the era where there was just one 'central' processor. I think the problem arises because people use them differently. A CPU could be a collection of processors (chips), a single processor (chip) or a core (sub-chip). What's the CPU in one of those mega-computers with thousands of cores, I wonder...
Regards, Rob Philpott.
