What do users consider an "instant" reaction? [closed] - performance

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How much time can elapse between users action and a reaction of the application to make the user feel like it was "instant" or "in an unnoticeable time span"? (Some say that 250ms, others say 100ms, whats the real number, approx?)

100ms is correct. Plus/minus something, depends on the user.
This article has a nice picture: http://en.wikipedia.org/wiki/Reaction_time
As you can see, 100ms is the time, a user detects a change, but he needs longer to respond to the change.

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What takes less time to complete, comparing two variables, or assigning a new value to a variable? [closed]

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Basically what I'm saying is, which operation takes less time to complete? I know the time it takes to complete 1 of these operations is too fast to measure, but I would assume that there would be some way to explain what happens that could explain which one is faster.
Also, I would assume that comparing two variables would be more taxing on the CPU and assigning a value would be more RAM taxing. Is that correct?
In American football, this would be like asking which is faster:
A running play?
A passing play?
It's too vague, too general to have any kind of sensible answer.

Why does process terminate on time overrun? [closed]

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I am reading Operating Systems by William Stallings. I came across the line below while reading reasons for process termination,
Time Overrun:
The process has waited longer than a specified maximum for a certain event
to occur.
For example, a program wants to take input from the user so its in the blocked state. Now if the user does not provide any input in a particular time period, according to this statement the program should go to exit state. This is impractical. None of the programs seem to do so. Please guide. Thanks
The reason may be given by the book is starvation. When a process needs execution of a certain task and it cannot be performed, this situation is called starvation. So, the process is made to terminate, if it reaches the dead line.

which is best for the client performance [closed]

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Which is better, small data size and more server requests, or large data size and fewer requests? Larger data size means longer processing time on ther server. How does this scale out thouh as the number of users and their activity increases?
It is always ideal to get all that you need in as many less calls as you can. If you can get all that you need in one call, definitely do it.
Also it will be very helpful if you can give some insight of what kind of application are we talking about here.

What is Coding in Vacuum? [closed]

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What does the term "Coding in Vacuum" mean? I have heard the term before but I am unable to find anything on Google that is relevant.
I interpret this as a derogatory comment about someone writing software while not considering the greater context of the project. For example:
"Didn't Bob know that this email client was supposed to handle emails
with images?"
"I guess not, I think he was just coding in a vacuum."
I like this answer from the English Usage StackExchange:
https://english.stackexchange.com/a/46270

How does the algorithm for the "report abuse" feature on a website work? [closed]

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I was just wondering- is there an automated way that the "report abuse" (for profane or inappropriate posts) feature works for a large website like, say, Amazon? Is it just a simple game of numbers (e.g. 100 ppl report the link so it should be taken down) or something more sophisticated?
It is a link on a website that the website-owner implemented? I don't think there is a some sort of top-down regulated method of implementing this, everyone does it's own thing. Some will be 'just simple numbers', some will be more sophisticated.
SO does both I guess: the more flags, the more a problem (spam for instance) gets attention of people who can lock, and flags of some users way heavier then others...

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