Something to learn: http://blog.csdn.net/yuwenshi/article/details/36666453 Shortest Job First Algorithm - kinda greedy: we do shorter job first BUT we only consider arrived jobs. #include <iostream> #include <fstream> #include <iterator>…

It is about how to choose btw. BFS and DFS. My init thought was to DFS - TLE\MLE. And its editorial gives a very neat BFS based idea which costs much less memory. https://www.hackerrank.com/challenges/beautiful-path/editorial…

http://www.onjava.com/pub/a/onjava/2001/05/30/optimization.htmlComparing the performance of LinkedLists and ArrayLists (and Vectors) (Page last updated May 2001, Added 2001-06-18, Author Jack Shirazi, Publisher OnJava). Tips: ArrayList is faster than…

1.0 Overview and history    ------------------------ fio was originally written to save me the hassle of writing special test case programs when I wanted to test a specific workload, either for performance reasons or to find/reproduce a bug. The proc…

[OS]NMON的简介和使用 目前NMON已开源,以sourceforge为根据地,网址是http://nmon.sourceforge.net. 1. 目的 本文介绍操作系统监控工具Nmon的概念.使用方式及使用参数.指导运维人员通过nmon工具监视AIX/Linux操作系统资源使用情况,收集监控结果及产生的数据文件,制作相关系统性能分析报告. 2. Nmon简介 Nmon (Nigel’s Monitor)是由IBM 提供.免费监控 AIX 系统与 Linux 系统资源的工具.该工具可将服务…

每1分钟运行一次,记录正在运行的SQL,监控数据 放在ReportServer库的t_WhoIsActive表中,保留最近30天的数据! USE [ReportServer] GO /****** Object: Table [dbo].[t_WhoIsActive] Script Date: 2018/4/23 17:07:09 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO SET ANSI_PADDING ON GO CRE…

The UNAL programming coaches have lost a bet, they bet the 6 UNAL teams would occupy the first six positions in the regional finals. Now, they have to shave their heads!. Some of them have more hair than others, and consequently, it takes more time t…

The present invention allocates resources in a multi-operating system computing system, thereby avoiding bottlenecks and other degradations that result from competition for limited resources. In one embodiment, a computer system includes resources an…

上篇 Erlang C1500K长连接推送服务-性能 提到:150w连接,使用了23GB内存,每个连接占用15KB,约一半是内核使用. 大概分析一下: 1. Erlang 节点 12GB,内部因为有内存池碎片问题,实际使用9GB,也就是实际每个进程+Port占用越6K,因为采用hibernate策略,已经没水分了. 2. linux内核 11GB,通过运行前后, cat /proc/meminfo 中 MemTotal - AnonPages 值的增加量基本就是内核占用. 实际Slab: 538…

/proc/slabinfo gives information about memory usage on the slab level. Linux kernels uses slab pools to manage memory above the page level. Commonly used objects have their own slab pools. Instead of parsing the highly verbose /proc/slabinfo file man…