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How to get line count of a large file cheaply in Python?

... for a 1.2 million-line text file. Windows XP, Python 2.5, 2GB RAM, 2 GHz AMD processor Here are my results: mapcount : 0.465599966049 simplecount : 0.756399965286 bufcount : 0.546800041199 opcount : 0.718600034714 Edit: numbers for Python 2.6: mapcount : 0.471799945831 simplecount : 0.6344000...
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MongoDB副本集详解 优于以往的主从模式 - 大数据 & AI - 清泛网 - 专注C/C++及核技术

...看起来很旧了,停止选举等待人来操作。 ? 如果上面都没有问题就选择最后操作时间戳最新(保证数据是最新的)的服务器节点作为主节点。 选举的触发条件 初始化一个副本集时。 副本集和主节点断开连接,可能是网络问...
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Find out what process registered a global hotkey? (Windows API)

...ram Files (x86)\Microsoft Visual Studio\2017\Community\Common7\Tools\spyxx_amd64.exe) In the menu bar, select Spy -> Log messages... (or hit Ctrl + M) Check All Windows in System in the Additional Windows frame Switch to the Messages tab Click the Clear All button Select WM_HOTKEY in the listbox,...
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Forward an invocation of a variadic function in C

...)(va_wrap_this_bp), va_wrap_size); #if ( __WORDSIZE == 64 ) /* System V AMD64 AB calling convention */ static inline uintptr_t __attribute__((always_inline)) va_wrap_get_bp() { uintptr_t ret; asm volatile ("mov %%rbp, %0":"=r"(ret)); return ret; } #define VA_WRAP_PROLOGUE() ...
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汇编常用寄存器及指令基础总结 - C/C++ - 清泛网 - 专注C/C++及核技术

...跳转 进位标志=1 JB,JNAE JNC JNC 如果进位位没有置位则跳转 进位标志=0 JNB,JAE JC JZ 如果0标志被置位则跳转 0标志=1 JE JNZ JNZ 如果0标志没有置位则跳转 0标志=0 JNE JZ JS 如果符号...
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C++特化模板函数的符号多重定义错误问题 - C/C++ - 清泛网 - 专注C/C++及核技术

... int compare(LPCTSTR s1, LPCTSTR s2) { return _tcscmp(s1, s2); } 没有理由不在头文件中定义函数——但是一旦这样做了,那么你便无法在多个文件中 #include 该头文件。至少,肯定会有链接错误。怎么办呢? 如果你掌握了模板函数特化...
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What is the “reactor” in Maven?

... If project list is specified, also build projects required by the list -amd, --also-make-dependents If project list is specified, also build projects that depend on projects on the list source share | ...
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新浪是如何分析处理32亿条实时日志的? - 更多技术 - 清泛网 - 专注C/C++及核技术

...先做了Elasticsearch优化,Hardware Level由于我们当时拿到机器没有选择余地,只开启了超线程;System Level的优化如关闭swap,调整max open files等;App Level的优化如Java运行环境版本的选择,ES_HEAP_SIZE的设置,修改bulk index的queue size等,另...
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What resources are shared between threads?

....) as you described. But I'm talking about segments, as specified in intel/amd x86 hardware. Not related at all to compilers/linkers. Hope that makes sense. – Alex Budovski Nov 19 '09 at 23:42 ...
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技术人员如何创业《一》—— 产品及想法 - 资讯 - 清泛网 - 专注C/C++及核技术

...着的东西。这样就错了!大错特错! 很多创业公司开始没有产品经理,像facebook的ceo扎克伯格。或者只有技术一个人,这个时候公司的创始人就承担了产品经理的角色,如果创始人就把自己的点子抛出来给大家或者稍微分解一...