大约有 40,000 项符合查询结果(耗时:0.0240秒) [XML]

https://www.tsingfun.com/it/tech/739.html 

TCP 的那些事儿(下) - 更多技术 - 清泛网 - 专注C/C++及内核技术

... 算法 但是上面的这个算法在重传的时候会出有一个终极问题——你是用第一次发数据的时间和ack回来的时间做RTT样本值,还是用重传的时间和ACK回来的时间做RTT样本值? 这个问题无论你选那头都是按下葫芦起了瓢。 如下图所...
https://stackoverflow.com/ques... 

Add Text on Image using PIL

... To add text on an image file, just copy/paste the code below <?php $source = "images/cer.jpg"; $image = imagecreatefromjpeg($source); $output = "images/certificate".rand(1,200).".jpg"; $white = imagecolorallocate($image,255,255,255); $black = imagecolorallocate($image,7,94,94); $font_siz...
https://www.tsingfun.com/it/op... 

ZMQ: 基本原理 - 开源 & Github - 清泛网移动版 - 专注C/C++及内核技术

...层传输之上提供完全相同的行为。 这种方法存在两个问题: 一,在特定的传输之上建立类TCP的封装实际上使得传输成为多余的了。如果这种方法的行为类似于TCP,那么为什么一开始就不用TCP呢?(性能特性排除在这个规...
https://www.tsingfun.com/ilife/idea/862.html 

新手程序员应该知道的7件事 - 创意 - 清泛网 - 专注C/C++及内核技术

...的甚至是几十年)作为专业软件工程师的工作经验。我的问题是,如果他们现在回过头去,哪些技能和知识是他们第一次以写代码为生的时候就希望能够掌握的。无论你是一个刚毕业刚开始自己第一份开发工作的大学生,还是年...
https://stackoverflow.com/ques... 

Git error on commit after merge - fatal: cannot do a partial commit during a merge

...o stage additional files before committing. That is: git commit -i myfile.php share | improve this answer | follow | ...
https://www.tsingfun.com/it/cp... 

内存管理内幕:动态分配的选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术

...II 上进行汇编语言编程的时代,那时内存管理还不是个大问题。您实际上在运行整个系统。系统有 多少内存,您就有多少内存。您甚至不必费心思去弄明白它有多少内存,因为每一台机器的内存数量都相同。 所以,如果内存需...
https://www.tsingfun.com/it/tech/1066.html 

Linux日志切分工具:Logrotate - 更多技术 - 清泛网 - 专注C/C++及内核技术

...似的还有Verbose选项,这里就不多说了。 Logrotate的疑问 问题:sharedscripts的作用是什么? 大家可能注意到了,我在前面Nginx的例子里声明日志文件的时候用了星号通配符,也就是说这里可能涉及多个日志文件,比如:access.log和e...
https://stackoverflow.com/ques... 

Mapping over values in a python dictionary

...e function the way you want (the name chosen in this answer is inspired by PHP's array_walk() function). Note: Neither the try-except block nor the return statements are mandatory for the functionality, they are there to further mimic the behavior of the PHP's array_walk. ...
https://stackoverflow.com/ques... 

In php, is 0 treated as empty?

... http://php.net/empty The following things are considered to be empty: "" (an empty string) 0 (0 as an integer) 0.0 (0 as a float) "0" (0 as a string) NULL FALSE array() (an empty array) var $var; (a variabl...
https://stackoverflow.com/ques... 

Cached, PHP generated Thumbnails load slowly

...t from the various waterfall graphs shown here is the main bottleneck: the PHP-generated thumbnails. The protocol-less jquery loading from CDN advised by David got my bounty, albeit making my site only 3% faster overall, and while not answering the site's main bottleneck. Time for for clarification ...