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从网购到火车票，对比淘宝12306网为何如此烂？ - 大数据 & AI - 清泛网 - ...
...到让人“一票难求”的订票网站-12306。12306网站购票难的问题几乎成了所有人的共识。来自前支付宝架构师冯大辉(@Fenng)的这条微博翻出12306这笔账，别有一番滋味。
以冯大辉的计算方法，支付宝11月11日一天就处理了1亿零580万...
How to determine the memory footprint (size) of a variable?
...libjudydebian1
sudo pecl install memprof
echo "extension=memprof.so" > /etc/php5/mods-available/memprof.ini
sudo php5enmod memprof
service apache2 restart
And then in my code:
<?php
memprof_enable();
// do your stuff
memprof_dump_callgrind(fopen("/tmp/callgrind.out", "w"));
Finally open the ...
Is calculating an MD5 hash less CPU intensive than SHA family functions?
Is calculating an MD5 hash less CPU intensive than SHA-1 or SHA-2 on "standard" laptop x86 hardware? I'm interested in general information, not specific to a certain chip.
...
What resources are shared between threads?
...two, and set CS to point to the code descriptor, and the rest (DS, ES, SS, etc) to point to the other [2]. But both point to the same stuff!
The person interviewing you had made a hidden assumption that he/she did not state, and that is a stupid trick to pull.
So regarding
Q. So tell me which...
C++ obtaining milliseconds time on Linux — clock() doesn't seem to work properly
...ld more (your program could run multiple threads and so could consume more CPU than real time) or less. It measures an approximation of CPU time used. To see the difference consider this code
#include <iostream>
#include <ctime>
#include <unistd.h>
int main() {
std::clock_t a...
写出高质量代码的10个Tips - 更多技术 - 清泛网 - 专注C/C++及内核技术
...。
基础的数据结构与算法，掌握好这些在解决一些特定问题时，可以以更加优雅有效的方式处理。
基础的设计原则，无需完全掌握23种经典设计模式，只需要了解一些常用的设计原则即可，甚至你也可以只了解什么是低耦合，...
How are everyday machines programmed?
... (not so much computers and mobile devices as appliances, digital watches, etc) programmed? What kind of code goes into the programming of a Coca-Cola vending machine? How does my coffee maker accept a pre-programmed time and begin brewing a pot of coffee hours later, when that time arrives?
...
乘着App的创业浪潮 行业短信也迎来了新生和爆发 - 资讯 - 清泛网 - 专注C/C...
...新生之后，如何提升用户体验，解决消息延迟、被拦截等问题成为了行业短信面临的最大难题。
逆势崛起：验证短信迎来脱胎换骨
毫无疑问，短信正在死亡，最具有代表性的便是拜年短信。除夕是拜年短信发送的高峰，甚至...
创业公司如何实施敏捷开发 - 资讯 - 清泛网 - 专注C/C++及内核技术
...这个东西并不是神器，实施了就可以解决所有软件公司的问题，而是要结合自己公司的特点和问题摸索出适合自己的一套模式。
大家都知道，创业公司刚开始需要研发出一款产品并且能够使公司赚钱的产品，不过大部分创业公...
Database sharding vs partitioning
... use the alphabet to divide the data. A-D is instance 1, E-G is instance 2 etc. Customer data is well suited for this, but will be somewhat misrepresented in size across instances if the partitioning does not take in to account that some letters are more common than others.
Another common technique...