What's The Frequency, Kenneth?  #include <stdio.h> main() { int i; char *suffix[]= { "st", "nd", "rd" }; char *item[]= { "Unix" , "cat", "sed", "awk", "grep", "ed&…

Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: "tree" Output: "eert" Explanation: 'e' appears twice while 'r' and 't' both appear once. So 'e' must appear before both 'r' and 't'. Th…

Write a bash script to calculate the frequency of each word in a text file words.txt. For simplicity sake, you may assume: words.txt contains only lowercase characters and space ' ' characters. Each word must consist of lowercase characters only. Wor…

在grafana界面中发现不少499的状态码,在网上了解到出现499的原因大体都是说服务端处理时间过长,客户端主动关闭了连接.   既然原因可能是服务端处理时间太长了,看一下upstream_response_time时间可以了解到后端程序处理了多久. 先了解一下什么是upstream_response_time和request_time分别是什么: request_time:服务端从接受客户端请求的第一个字节到服务端应用程序处理完发送完响应数据的时间,包括请求数据时间.程序响应时间.输出响应时…

题目: Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: "tree" Output: "eert" Explanation: 'e' appears twice while 'r' and 't' both appear once. So 'e' must appear before both 'r' and 't'…

Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Input: "tree" Output: "eert" Explanation: 'e' appears twice while 'r' and 't' both appear once. So 'e' must appear before both 'r' and 't'. Th…

CPU frequency and voltage scaling code in the Linux(TM) kernel CPU frequency scaling Using CPUfreq Governors…

1.问题描述 140.207.202.187 - - [18/May/2016:10:30:58 +0800] "POST/v3/violations HTTP/1.1" 499 0 "-" "-" 42.236.10.71 - - [18/May/2016:10:30:59 +0800] "POST /v3/violationsHTTP/1.1" 499 0 "-" "-" 2.问题分…

什么是高频交易系统 1 交易指令完全是由电脑发送,对市场数据的响应延时在微秒级2 系统有专用的软硬件组成,研发时需要大量的计算机专家级的工作3 系统的硬件需要放在离交易所主机很近的位置,所谓co-location.并且得到专门的准入许可证,交易指令发送至交易所. 符合以上三点,就可以叫做高频交易系统(High Frequency Trading  HFT) 所谓[高频],并非一定是指成交的频率高,有些系统只是下委托单和修改.回撤委托单的频率高,真正的成交次数可能并不多,也一样高频交易系统 美国证…

日志记录中HTTP状态码出现499错误有多种情况,我遇到的一种情况是nginx反代到一个永远打不开的后端,就这样了,日志状态记录是499.发送字节数是0. 老是有用户反映网站系统时好时坏,因为线上的产品很长时间没有修改,所以前端程序的问题基本上可以排除,于是就想着是Get方式调用的接口不稳定,问了相关人员,说没有问题,为了拿到确切证据,于是我问相关人员要了nginx服务器的日志文件(awstats日志),分析后发现日志中很多错误码为499的错误,约占整个日志文件的1%,而它只占全部报错的70%左…