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一体化的Linux系统性能和使用活动监控工具–Sysstat - 更多技术 - 清泛网 -...
...：
Sysstat的功能列表：
iostat：统计并报告你的设备的CPU状态和I/O状态数据。
mpstat：监控和显示关于CPU的细节信息。
pidstat：统计正在运行的进程/任务的CPU、内存等信息。
sar：保存和报告不同资源（CPU、内存、输入输出、网...
AtomicInteger lazySet vs. set
...ill see it at the next read, because the cache coherence protocol of intel cpu will garantee LazySet works, but the cache line will be updated at the next read, again, the CPU has to be modern enough.
http://sc.tamu.edu/systems/eos/nehalem.pdf
For Nehalem which is a multi-processor platform, the pr...
How much overhead does SSL impose?
...ources were required; no network hardware, no new hosts. It only increased CPU load by about 1%.
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Profiling Django
...he Debug Toolbar made things process. My sql queries were small (30ms) but cpu time was very high (800ms). Another page i was tuning had sql times of 300ms, and cpu time of 8000ms - so i kept trying to find the source of the problem. Turning Django Toolbar off sped things right up. 3 years later, st...
BLE（二）信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区，...
...一定频率范围下的频带资源（Frequency Band）；
BLE的市场定位是个体和民用，因此使用免费的ISM频段（频率范围是2.400-2.4835 GHz）；
为了同时支持多个设备，将整个频带分为40份，每份的带宽为2MHz，称作RF Channel。
所以经过上面...
boost多索引容器multi_index_container实战 - C/C++ - 清泛网 - 专注C/C++及内核技术
...越多的同行们能快速高质量地解决实际项目中遇到的各种问题，在此将我将自己实战中实用boost的经验分享给大家，本人才疏学浅，如果有什么问题希望读者们能帮助指出，大家共同探讨^_^
本章介绍的主题是multi_index_container
注...
Stack Memory vs Heap Memory [duplicate]
...m C++.
Generally speaking, the stack is preferred as it is usually in the CPU cache, so operations involving objects stored on it tend to be faster. However the stack is a limited resource, and shouldn't be used for anything large. Running out of stack memory is called a Stack buffer overflow. It's...
无社交不商业，Uber将边缘化BAT - 资讯 - 清泛网 - 专注C/C++及内核技术
...司，居然打败了如此强大的出租车公司。
这说明了一个问题：就是连接比拥有更加重要。
连接是一种关系，而你拥有的只是物质，也就是说，现在的世界，关系比物质更重要。
讲到这里，我们还没有真正了解互联网...
What's the difference between compiled and interpreted language?
...ist.
Basically, compiled code can be executed directly by the computer's CPU. That is, the executable code is specified in the CPU's "native" language (assembly language).
The code of interpreted languages however must be translated at run-time from any format to CPU machine instructions. This tr...
LinkedIn联合创始人：初创企业早期别花钱买用户 - 资讯 - 清泛网 - 专注C/C...
...程是如何运作的”的数据以及信息，虽然他们设计的招聘问题很有趣，但事实上经过专业训练的HR都不会提出(Google报告里)这些问题，这些问题的设计者，要是很熟悉HR问的问题但又不拘泥于传统观念的人，他也必须是要理解招聘...