关系再好也一定要做好需求分析，要有详细的文档。

工作两年半了，从没像最近这么忙过。
10点半前回家算少见的，还在公司通宵过两次。
周末难得休息两天就觉得很幸福了。

接下来一个月会更忙碌。今天开会老大说：“大家忙碌了快一年了，不要在最后阶段掉链子。接下来3周周末就不休息了，大家一起努力把内测版给好好发出来，可以安心过个好年。“

WTF!

Since a virtual address is encoded by such a word, the most important system parameter determined by the word size is the maximum size of the virtual address space.

32位系统最大支持内存是4G。
2³⁰ = 1GB
2³² = 4GB

那么64位能支持多少呢？

2⁴⁰ = 1TB
2⁵⁰ = 1PB
2⁶⁰ = 1EB
2⁶⁴ = 16EB
我擦好吓人~ 没想到有这么多~

The memory system

L0 : registers
L1 : on-chip L1 cache (SRAM)
L2 : off-chip L2 cache (SRAM)
L3 : main memory (DRAM)
L4 : local secondary storage (local disk)
L5 : remote secondary storage (distributed file systems, Web servers)

from top to botton, Larger,slower, and cheaper storage devices
register file is a cache for the L1 cache, which is a cache for the L2 cache, which is a cache for the main memory, whici is a cache for the disk.

The Operating System Manages The Hardware

Processes

A process is the operating system’s abstraction for a running program.

参考 http://stackoverflow.com/questions/9353804/cf-objects-vs-ns-objects

1.不是所有的CF类有等价的NS类，反之亦然。
2.有相同名称的类不一定做相同的事。
3.尽量用NS。底层框架不支持NS，或性能要求高的部分用CF。

按照惯例每年三个

我的

1. 收入达到预期
2. 技术提高
3. 买新手机，不丢手机

老婆的

1. 读完100本
2. 实习顺利
3. 爸妈跟老公身体健康开开心心的度过一年

set foldmethod = indent

zM 全部折叠
zR 全部打开

若一条命令被设置过别名，你又想执行原始版本，则需要在命令前加上反斜杠

例如：
alias ls=”ls -l”
ls /usr/bin 等于 ls -l /usr/bin
\ls /usr/bin 等于 ls /usr/bin

sudo !!

以root的身份执行上一条命令 。

@class

告诉编译器有这样一个类，不会引入类的内容，节省时间。
- 1. 需要用到这个类名，但不需要类的成员或方法时尽量用@class，否则需要用#import。
- 2. 两个类相互引用引起死锁时，要使用@class。

1. He paid upfront.
2. I got a new gig.
3. I’m still on the fence.
4. I’m on a tight budget.
5. She’s the breadwinner.
6. It was Bettle’s rip-off.
7. My computer crashed.
8. We had a working lunch.
9. I felt very out of place.
10. It was just passing fad.
11. I have some reservations.(我保留意见)
12. Actually, I am between jobs. (I’m unemployed.)
13. We need to meet halfway. (妥协,compromise)
14. Please keep me informed.
15. Don’t be such a know-it-all.(自以为无所不知的人)
16. You are behind on your rent.(behind=late)
17. His Optimism is contagious.(他的乐观情绪有传染性的)
18. He maxed out his credit card.(超过信用额度credit line)
19. The company went belly up.(倒闭)
20. You are better off not doing it.(更好)