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驯服Linux OOM Killer（优质英文资料翻译） - 操作系统(内核) - 清泛网移动...
...OOM Killer？
主要发行版内核设置/proc/sys/vm/overcommit_memory的默认值 为零，这意味着进程可以请求比系统中当前可用的内存更多的内存。这是基于试探法完成的，即分配的内存不会立即使用，并且进程在其生命周期内也不会使用它...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎 ...
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属性
此属性定义数据库文件的名称。其默认值为“db.sqlite”。
打开数据库后更改名称不会对数据库产生影响。
使用此属性可以在打开数据库之前更改名称。
这是数据库的“版本”，应用将定义它与哪个...
Android emulator shows nothing except black screen and adb devices shows “device offline”
...ulator by issuing the command emulator @A2 , an emulator comes up on the screen. But even after waiting for as long as 2-3 hrs, all it shows is a black screen. Not even the android home screen or the android logo. Just a black screen. And while initially "adb devices" shows the emulator as offline...
How Do I Take a Screen Shot of a UIView?
I am wondering how my iPhone app can take a screen shot of a specific UIView as a UIImage .
15 Answers
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Android, canvas: How do I clear (delete contents of) a canvas (= bitmaps), living in a surfaceView?
...nt to clear your Canvas with.
And: how can I update just a part of the screen ?
There is no such method that just update a "part of the screen" since Android OS is redrawing every pixel when updating the screen. But, when you're not clearing old drawings on your Canvas, the old drawings are st...
Redirecting Output from within Batch file
... write to two or more files. You might also want different messages on the screen. It is still possible to to do this efficiently by redirecting to undefined handles outside a parenthesized block or subroutine, and then use the & notation to reference the already opened files.
call :sub 9>Fi...
How to run a program without an operating system?
...ually select it every time, I would hit F1 on the "Startup Interrupt Menu" screen, and then navigate to:
Boot sector
On x86, the simplest and lowest level thing you can do is to create a Master Boot Sector (MBR), which is a type of boot sector, and then install it to a disk.
Here we create one with...
select、poll、epoll之间的区别总结[整理] - C/C++ - 清泛网 - 专注C/C++及内核技术
...很多时也很大
（3）select支持的文件描述符数量太小了，默认是1024
2 poll实现
poll的实现和select非常相似，只是描述fd集合的方式不同，poll使用pollfd结构而不是select的fd_set结构，其他的都差不多。
关于select和poll的实现分析，可...
vs2008编译boost详细步骤 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...删除了)
--stagedir=<stagedir>
存放编译后库文件的路径，默认是stage
--build-type=complete
编译所有版本，不然只会编译一小部分版本（相当于:
variant=release,threading=multi;
link=shared|static;runtime-link=shared）
variant=debug|release
决定...
Paging UICollectionView by cells, not screen
...izontal scrolling and there are always 2 cells side-by-side per the entire screen. I need the scrolling to stop at the begining of a cell. With paging enabled, the collection view scrolls the whole page, which is 2 cells at once, and then it stops.
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