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回国被人送了一本介绍海归的书

回国被人送了一本介绍海归的书# Biology - 生物学

c*e2015-02-17 08:02

1 楼

Thanks.

d*a2015-02-17 08:02

2 楼

。。。。。。

b*s2015-02-17 08:02

3 楼

本版名ID的故事也在里面，作为80后年青女性的代表。
怀着崇拜，我反复拜读了很多遍。。。

A*i2015-02-17 08:02

4 楼

前者是映射的容器，后者是映射方法

d*a2015-02-17 08:02

5 楼

zz
My personal view (Might not be the answer you seek):
Why Android consumes more power?
Android applications utilize Google's highly optimized Java Virtual Machine.
So if you are looking from out side, an Android application is run inside a
virtual machine which is inside the real machine. So you actually have two
machines instead of one.
Everytime an android app produces an instruction, it should be translated to
into the native machine code from an intermediate code and is then executed
by the CPU. This is an extra step which consumes power.
Ubuntu Touch's Internal Nature
Ubuntu touch has no Java Virtual Machine overhead. It can directly run
binary programs compiled for the CPU, completely eliminating the need of
translation. So we know the power consumption should be less in Ubuntu Touch
for a certain extent.
However most Ubuntu Touch apps so far use an interpreter called qmlscene
which does something similar to Java Virtual Machine. Those apps aren't in
binary format but human readable code. The code is interpreted to CPU
instructions at run time. qmlscene's impact on performance is less than Java
runtime, because no virtual machine is involved. It is not noted to be a
power hungry system as QT developers have made it extremely efficient.
There are many other reasons for extra power consumption as well. It
includes 3G/4G usage management, background services etc. We ignore such
facts, because they get different from one device to another. Those facts
are at least controllable by the operating system for a certain extent.
Summary
Ubuntu touch will most probably consume less power than Android. At the time
of writing it is not yet optimized to do so. We will have to wait until
phones come out.

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