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<strong>An Overview of Chemical Elements </strong>
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Multitasking and Power Issues in Computing
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What it means to multitask?....no, not chatting with 3 friends at the
same time and watching The Superbowl!
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<p>
In computing, multitasking is a method by which multiple tasks, also
known as processes, share common processing resources such as a CPU. In
the case of a computer with a single CPU, only one task is said to be
running at any point in time. Multitasking solves the problem by
scheduling which task is running at any given time and when a waiting
task gets a turn. The act of reassigning a CPU from one task to another
one is called a "context switch". When context switches occur frequently
enough the illusion of parallelism is achieved. Parallelism is the name
given to doing multiple things at the same time. Even on computers with
more than one CPU (called multiprocessor machines), multitasking allows
many more tasks to be run than there are CPUs. <i>Source: Wikipedia</i>
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Explain multitasking in no more than two sentences.
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Why don't iPhones multitask?
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Both the iPad and iPhone, as mobile devices, have limited memory (256MB
in the current incarnations) and no hard drive. No hard drive means no
swap file. Limited memory and no swap imply that applications have a
small, fixed amount of memory at their disposal. They don’t have the
luxury of seemingly-infinite memory, as a modern system with swap has.
Memory consumption is thus a critical system constraint. Like most
systems, the iPad and iPhone deal with this by killing applications that
use too much memory via a mechanism called the out of memory (OOM)
killer. Unlike most systems, applications designed for the iPad and
iPhone know how much memory they have at their disposal, and are
designed to operate within those constraints. This is classic memory
management in embedded programming. No swap, fixed memory, you deal.
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What applications make the iPhone stand out? What are your thoughts on
it's multitasking abilities or rather the lack of it?
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Why phones don't multitask:
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• Screen real-estate: There's only so much you can do with a 3-to-4 inch
screen at one time.<br>• Battery life: You want your phone to actually
last all day, or come close to it, right?<br>• CPU: It's slower than
anything in a laptop, because of size and battery life.<br>• Memory:
There's not that much of it, also partly because of battery life.<br>•
Battery: Doing more than one thing at a given time requires a lot of
power, this takes a toll on the battery life and drains the battery of
power.
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How do Androids multitask?
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The Android platform was designed from the ground up for use on phones and
other embedded devices. They introduced a mechanism where applications
could save their state, including their current view, with the system.
This is called the <i face="Verdana">"state-saving"</i>
mechanism and is known as <strong>Bundles</strong>. Like the iPad and
iPhone, Android uses a powerful, modern operating system, the Linux
kernel. Unlike the iPad and iPhone, it also uses Bundles, which allow apps
to save their state. 'Saving a State' refers to pausing an application,
switching on to the next one and undoing the pause on switching back to
the previous application. Multitasking is achieved by saving a running app
in it's current state and reverting to working phase whenever prompted. It
does not actually run several applications but pauses the ones not in use!<br><br>Android’s
OOM killer is aware of background applications and is capable of killing
them in least-recently-used order. If the user switches back to an
application that has been killed, the Android platform reloads the
application’s state via Bundles. The whole process is seamless. Because
Android has this state-saving framework, multitasking is feasible even on
a device with limited memory and no swap.
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What is meant by state saving mechanism? What has android achieved with
this mechanism?
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<strong>You have reached the end of Part 2. </strong>
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Part 2 The Chemical Elements
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