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使用TokuMX配置Replica Set集群 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
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use admin
db.shutdownServer()
有任何关于MongoDB/TokuMX方面的问题，欢迎回复评论。集群 TokuMX MongoDB
C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
...问0x4的内存地址，不crash才怪。于是，你一定会有如下的问题：
1）为什么不是 13行if语句出错？f.a被初始化为空了嘛，用空指针访问成员变量为什么不crash？
2）为什么会访问到了0x4的地址？靠，4是怎么出来的？
3）代码中的...
那些我印象深刻的建议和教诲 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...弱点，真是人生的一大考验。有些人采取鸵鸟政策，假装问题不存在；有些人一看苗头不对就转移，避开心虚；还有些人打肿脸充胖子，掩盖心虚。总之，都是在躲，都是不健康的应对。
真正健康的方式是什么？是努力戒除情...
裁员！裁员！创业者们的2016“寒冬大逃杀” - 资讯 - 清泛网 - 专注IT技能提升
...候，“什么时候盈利”忽然成了几乎每个投资人都会问的问题，但在之前的三轮融资都没有人提过。当时大家关心的都是订单量、GMV和增速。
“无论公司当下有没有收入，从财务模型上看，都是要在收敛的、亏损是在变小的。...
How do you performance test JavaScript code?
CPU Cycles, Memory Usage, Execution Time, etc.?
22 Answers
22
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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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TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展 · App Inventor 2 中文网
...I（Android >= 10）
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TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展
在无线局域网中使用的功能块。
.aix 拓展下载：
com.puravidaapps.Taifu...
Pandas aggregate count distinct
...aframe, then grouped to ~2M
%time _=g.agg({"id": lambda x: x.nunique()})
CPU times: user 3min 3s, sys: 2.94 s, total: 3min 6s
Wall time: 3min 20s
%time _=g.agg({"id": pd.Series.nunique})
CPU times: user 3min 2s, sys: 2.44 s, total: 3min 4s
Wall time: 3min 18s
%time _=g.agg({"id": "nunique"})
CPU...
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...
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...