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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
...用户态拷贝到内核态，这个开销在fd很多时会很大
（2）同时每次调用select都需要在内核遍历传递进来的所有fd，这个开销在fd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...
SQL Server Script to create a new user
...
2
GO
3
SP_ADDSRVROLEMEMBER 'LOGIN_NAME','SYSADMIN'
4
GO
Use CTRL+C to end both processes in the Command Prompt windows; you will be prompted to press Y to end the SQL Server process.
Restart the MSSQL service.
That’s it! You should now be able to log in using your network login.
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Best way to add comments in erb
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@Mike Ctrl+Shift+Period (i.e. Ctrl+GreaterThan) 4 times quickly should do it.
– John Douthat
Aug 11 '10 at 16:02
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Recursion in Angular directives
....ready(function() {
angular.module('mainApp', [])
.controller('mainCtrl', mainCtrl)
.directive('recurv', recurveDirective);
angular.bootstrap(document, ['mainApp']);
function recurveDirective() {
return {
template: '<ul><li ng-repeat="t in tree">{{t.sub...
Eclipse does not highlight matching variables
... This is also what caused it in the first place, when instead of Ctrl + Shift + o organizing imports the highlighting is turned off -.-
– fl0w
Jan 16 '18 at 12:52
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Suppressing “is never used” and “is never assigned to” warnings in C#
... Its not immediately obvious but you can use Find in the Output window via CTRL+F, type in "warning", click "Find All" and get every warning quickly, with warning numbers displayed. That said the [StructLayout(LayoutKind.Sequential)] attribute handles interop much better as per Greg Beech's comment ...
How can I mark “To Do” comments in Xcode?
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You can use XToDo plugin
https://github.com/trawor/XToDo
use ctrl+t to trigger the List Window on/off
Easy install with alcatraz
use ctrl+t to trigger the List Window on/off
share
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How to add text at the end of each line in Vim?
...in Normal mode, Visual select a paragraph vip, switch to Visual block mode CTRLV, append to all lines $A a comma ,, then press Esc to confirm.
The documentation is at :h v_b_A. There is even an illustration of how it works in the examples section: :h v_b_A_example.
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How do you print in a Go test using the “testing” package?
...hat's happening in the logs immediately to understand what's going on, hit CTRL+C to shut the test down early if necessary, make another change, re-run the tests, and so on.
If TestFoo is slow (e.g., it's an integration test), I get no log output until the very end of the test. This significantly ...
How can I use tabs for indentation in IntelliJ IDEA?
...lliJ IDEA 15
Only for the current file
You have the following options:
Ctrl + Shift + A > write "tabs" > double click on "To Tabs"
If you want to convert tabs to spaces, you can write "spaces", then choose "To Spaces".
Edit > Convert Indents > To Tabs
To convert tabs to spaces, y...