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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...es exhausted, couldn’t send query, couldn’t send query: Broken pipe
接着使用strace跟踪了一下PHP脚本，发现进程卡在了recvfrom操作上：
shell> strace -f -r -p <PID>
recvfrom(<FD>,
通过如下命令查询recvfrom操作的含义：
shell> apropos recvfrom
rece...
总结const_cast、static_cast、dynamic_cast、reinterpret_cast - C/C++ - ...
...，这样怎么也骗不过去了。
在应用多态编程时，当我们无法确定传过来的对象的实际类型时使用dynamic_cast，如果能保证对象的实际类型，用static_cast就可以了。至于reinterpret_cast，我很喜欢，很象c语言那样的暴力转换：）
dy...
Python Script execute commands in Terminal
...ocess.Popen(["ping","-W","2","-c", "1", "192.168.1.70"], stdout=subprocess.PIPE)
output = test.communicate()[0]
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Git: How do I list only local branches?
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If the leading asterisk is a problem, I pipe the git branch as follows
git branch | awk -F ' +' '! /\(no branch\)/ {print $2}'
This also eliminates the '(no branch)' line that shows up when you have detached head.
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菜单的背景颜色 - C/C++ - 清泛网 - 专注C/C++及内核技术
...，而且菜单项不具有MF_OWNERDRAW属性， 即使接到消息，也无法自绘，所以上面的ChangeMenuItem函数就是用于修改菜单项属性
WM_MEASUREITEM和WM_DRAWITEM消息不是直接发给菜单窗口的，会被父窗口给收到，所以得处理父窗口的WM_MEASUREITEM和W...
数据挖掘——分词入门 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...早期宇宙中星系互连关系，和大脑神经元相互连接，几乎无法分辨两张图之间的不同，大脑细胞与整个宇宙拥有一样的结构。
宇宙芸芸众生都是相通的，大脑也许就是一个小宇宙，在这个小宇宙又有很多星球、住着很多生物。...
how perform grep operation on all files in a directory
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If you decide to use find, pipe the output through xargs rather than using -exec this will be much faster, because -exec spawns a new process for each grep, and the overhead becomes significant with a large number of files. Standard warnings about spac...
Performance optimization strategies of last resort [closed]
...mory, can cause a certain pathological behavior that causes the entire CPU pipeline to clear on a load op. Find places where floats, vectors, and ints are being cast to one another and eliminate them. Use __restrict liberally to promise the compiler about aliasing.
Microcoded operations. Most proces...
Is there a command to list SVN conflicts?
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On Linux, if you want to see only the conflicts, pipe the status through grep.
svn status | grep -P '^(?=.{0,6}C)'
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为什么说自媒体到了最危险的时期？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...，写作者肯定得费一番精力的。所以注定佳作频出很难，无法成为一个常态。著名编剧、微博大v史航说：“写不出稿子或本子的时候，我就对生活更增加热爱，一般会去逛旧书店，买很多书，像你们女人失恋了就去买衣服买鞋...