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What's better at freeing memory with PHP: unset() or $var = null
...age collector will do it when it see fits - by intention as soon, as those CPU cycles aren't needed anyway, or as late as before the script would run out of memory, whatever occurs first.
If you are doing $whatever = null; then you are rewriting variable's data. You might get memory freed / shrunk f...
O2O江湖:2015大洗牌 2016 BAT等巨头将“肉搏” - 资讯 - 清泛网 - 专注C/C++及内核技术
...。新政一出，不禁让人质疑，这岂不是让本想解决出租车问题的专车沦为跟出租车一样的“二出租”？
移动会议专家创始人余德认为：“拥堵、安全等不是管理专车的遮羞布，牌照制才是出租领域的恶根。放弃既得利益、寻租...
How do you performance test JavaScript code?
CPU Cycles, Memory Usage, Execution Time, etc.?
22 Answers
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What is an OS kernel ? How does it differ from an operating system? [closed]
...le users to get something done (i.e compiler, text editor, window manager, etc).
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std::vector performance regression when enabling C++11
...a.out' (10 runs):
35.426793 task-clock # 0.986 CPUs utilized ( +- 1.75% )
4 context-switches # 0.116 K/sec ( +- 5.69% )
0 CPU-migrations # 0.006 K/sec ( +- 66.67...
How to override !important?
... forces me to hack around their hack, then someone to hack around my hack, etc.. In my case I have to deal with templates that pull their CSS from a database somewhere. I grep the DB dump and it shows me it comes from a 1MB json blob. Not very useful to me in finding where to change it, forcing me t...
C++11 introduced a standardized memory model. What does it mean? And how is it going to affect C++ p
...n does not make reference to any particular compiler, operating system, or CPU. It makes reference to an abstract machine that is a generalization of actual systems. In the Language Lawyer world, the job of the programmer is to write code for the abstract machine; the job of the compiler is to act...
What does WISC (stack) mean? [closed]
...m "stack computers" (stack machines).
Perhaps the most famous are the WISC CPU/16 and the WISC CPU/32 designed by Philip Koopman; each design is a "stack computer" (as opposed to a "memory-to-memory machine" or "RISC" or "accumulator machine").
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What does scale horizontally and scale vertically mean? [duplicate]
...unchanged. Reasons to scale vertically include increasing IOPS, increasing CPU/RAM capacity, and increasing disk capacity.
Horizontal Scaling
Horizontal scaling, or increasing the number of nodes in the cluster, reduces the responsibilities of each member node by spreading the keyspace wider and p...
register int i;的含义 - C/C++ - 清泛网 - 专注C/C++及内核技术
...t i;的含义register声明的作用是为了提高效率。它明确要求CPU把变量始终保存在寄存器里面，直至它消亡。不过现代编译器都很厉害，根本不需要你多此一...register声明的作用是为了提高效率。
它明确要求CPU把变量始终保存在寄...