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What do 'real', 'user' and 'sys' mean in the output of time(1)?
...is means executing CPU time spent in system calls within the kernel, as opposed to library code, which is still running in user-space. Like 'user', this is only CPU time used by the process. See below for a brief description of kernel mode (also known as 'supervisor' mode) and the system call mech...
Can't install via pip because of egg_info error
...ll pip by using below command or following link How do I install pip on macOS or OS X?
curl https://bootstrap.pypa.io/get-pip.py -o - | python
Upgrade pip after it's installed
pip install -U pip
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What is difference between Errors and Exceptions? [duplicate]
...eption classes are checked exceptions.
Checked exceptions are generally those from which a program can recover & it might be a good idea to recover from such exceptions programmatically. Examples include FileNotFoundException, ParseException, etc. A programmer is expected to check for these exc...
In PyCharm, how to go back to last location?
...le > settings > keymap > main menu > navigate > back".
I chose Alt+Left, which intuitively feels likes web browsers "back" behavior.
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App Inventor 2 向心力实验App - 探究向心力F与角速度ω、半径r、质量m的关...
...骤
6.1 准备工作
1. 在手机上安装向心力实验App
2. 准备一个旋转装置（如沙拉甩干机、小型旋转台、手摇转盘）
3. 准备手机固定支架
4. 准备不同质量的物体（如砝码，用于验证 F 与 m 的关系）
6.2 探究 F 与 ω 的关系
1. 输...
How do I update all my CPAN modules to their latest versions?
...
You can find out more about cpanminus and cpan-outdated at the Github repos here:
https://github.com/miyagawa/cpanminus
https://github.com/tokuhirom/cpan-outdated
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How to view or edit localStorage
...pplication > Local Storage to add a new value.
– Rose Perrone
Apr 18 '18 at 15:09
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Where are the PostgreSQL logs on macOS?
I would like to take a look at the PostgreSQL log files to see what my app writes to them but I can't find them.
8 Answers
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Virtual Memory Usage from Java under Linux, too much memory used
...nt set size: the number of pages that are currently resident in RAM. In almost all cases, this is the only number that you should use when saying "too big." But it's still not a very good number, especially when talking about Java.
SHR is the amount of resident memory that is shared with other proce...
“二孩”遇上母婴产业 创业者必读的数据干货 - 资讯 - 清泛网 - 专注C/C++...
...女性，占65.9%；其次是35-46岁的已婚女性，达19.8%。
另外一个值得关注的现象是，移动端母婴用户在三线及以下城市更为集中。
在所有的母婴用户人群中，怀孕人群对媒体的依赖度高；育儿人群的生活服务需求则较高，更加...