Similarities and differences of multitasking and multithreading?

Answer 1

Both terms are used to describe a computer process known as multi-tasking, where a single CPU core switches between tasks periodically to reduce inefficiency and wasted time, and to allow the user to perform multiple tasks at the same time. The difference between the two are technical distinctions, rather than a difference in their intended effect.

Multiprogramming was the first form of multi-tasking, and introduced in the the concept of yielding. When an instruction could not be completed immediately (such as when reading from a disk or other slowperipheral, the current task was set aside, and another task would run until the data from the paused task was ready.

Some time later, time sharing was introduced to allow more fine-grained control over the yielding process. The first form was known as cooperative time sharing. In this model, a program would run for a while and then willingly relinquish control so that another process could have a chance. This was referred to as cooperative time sharing. This model had some drawbacks, as programs could be written incorrectly and fail to yield in a timely manner, causing the system to become slow and unresponsive. Additionally, programs cooperated in the same unprotected memory space, so a crash of one program meant that the entire system could be brought down by a single fault.

Advances in hardware allowed for the processes to be interrupted by the operating system. This brought about the next generation of time sharing, known as preemptive time sharing. Along with this model came advances in virtual memory that allowed each program to run in its own virtual memory space. No longer would a single program cause a systemic crash, and a program could no longer fail to yield (in theory, at least).

Answer 2

Multiprograming system is that system in which multiple programs run at same time or simontaniously for example windows xp.in this system does not provide user interaction with the coputer system. But time sharing systemis that provide user interaction with system and user thinks that system is with him all the time.

Answer 3

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[now primarily historical] Timesharing is the technique of scheduling a computer's time so that they are shared across multiple tasks and multiple users, with each user having the illusion that his or her computation is going on continuously. John McCarthy, the inventor of http://www.answers.com/topic/lisp-programming-language, first imagined this technique in the late 1950s. The first timesharing operating systems, BBN's "Little Hospital" and http://www.answers.com/topic/ctss, were deplayed in 1962-63. The early hacker culture of the 1960s and 1970s grew up around the first generation of relatively cheap timesharing computers, notably the http://www.answers.com/topic/dec-technology 10, 11, and http://www.answers.com/topic/vax lines. But these were only cheap in a relative sense; though quite a bit less powerful than today's personal computers, they had to be shared by dozens or even hundreds of people each. The early hacker comunities nucleated around places where it was relatively easy to get access to a timesharing account. Nowadays, communications bandwidth is usually the most important constraint on what you can do with your computer. Not so back then; timesharing machines were often loaded to capacity, and it was not uncommon for everyone's work to grind to a halt while the machine scheduler thrashed, trying to figure out what to do next. Early hacker slang was replete with terms like cycle crunch and cycle drought for describing the consequences of too few instructions-per-second spread among too many users. As GLS has noted, this sort of problem influenced

Answer 4

Multithreading:

Multithreading is a process of executing multiple threads simultaneously.

The concept of threads provides a mechanism to make maximum utilization of CPU.Basically a thread is a light weight process.

Both multithreading and multiprocessing are used to achieve multitasking.But multithreaing is more effective than multiprocessing because multithreading share common memory area but multitasking will allocate separate memory area for each and every process.

Executing several tasks simultaneously is called multitasking. Multitasking is used for maximum utilization of cpu.

Multitasking:

Mutitasking is achieved in two ways:

• process based multitasking
• Thread based multitasking

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