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程序员之网络安全系列（六）：动态密码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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程序员之网络安全系列（五）：数字证书以及12306的证书问题 我们使用了数字证书，确保了对方的公钥身份，也就是互联网中确定了要访问的网站就是你要访问的网站。
但是我们如何确定要访问这个网站的用户就是要访问的用...
How to tell if browser/tab is active [duplicate]
...b. It serves no purpose if the user isn't looking at it and is potentially CPU-intensive, so I don't want to just waste cycles in the background.
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Why do stacks typically grow downwards?
...n (because I didn't design them). My thoughts on the matter are that early CPUs got their original program counter set to 0 and it was a natural desire to start the stack at the other end and grow downwards, since their code naturally grows upward.
As an aside, note that this setting of the prog...
Sleeping in a batch file
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This should be accurate, but it is a CPU intensive way to go about it. Normally you want an interupt driven implementation so that the process does not consume CPU cycles while it waits. This shouldn't be a problem for infrequent short waits, as is probably the ...
2015年硅谷最火的高科技创业公司都有哪些 - 资讯 - 清泛网 - 专注C/C++及内核技术
...，容错处理，框架已经帮你做好了。
MapReduce模型有什么问题？
第一：需要写很多底层的代码不够高效，第二：所有的事情必须要转化成两个操作Map/Reduce，这本身就很奇怪，也不能解决所有的情况。
Spark从何而来？Spark相比于H...
Why is Go so slow (compared to Java)?
... Generally, real world systems are constrained by IO not by CPU. Therefore, whether Go is 2x or 5x is slower hardly makes as much as a difference to capacity planning as failover, load balancing, caching, database topology and the like. This is why apps at the scale of YouTube can af...
Floating point vs integer calculations on modern hardware
...all of the data can reside in cache, where they can be quickly sent to the CPU. A very, very slow floating point operation that already has the data in cache will be many times faster than an integer operation where an integer needs to be copied from system memory.
I assume that you are asking thi...
Should I always use a parallel stream when possible?
...elves may be processed simultaneously. In other words, if you have several CPU cores available, each part can run on its own core independently of the other parts, while processing its own elements sequentially. (NOTE: I don't know, if this is how parallel Java streams work, I'm just trying to clari...
大单融资后，MOOC去哪儿 - 资讯 - 清泛网 - 专注C/C++及内核技术
...主任蒋健伟表示，“MOOC能有效解决教育资源分配不均的问题，通过校际间的课程互补，提高各所学校的教学能力。”
在MOOC逐渐受到关注的同时，资本也开始发力。2014年12月，果壳网与学堂在线分别获得C轮和A轮融资。据了解，...
How to debug a GLSL shader?
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You can't easily communicate back to the CPU from within GLSL. Using glslDevil or other tools is your best bet.
A printf would require trying to get back to the CPU from the GPU running the GLSL code. Instead, you can try pushing ahead to the display. Instead ...