Latency,中文译作延迟.Throughput,中文译作吞吐量.它们是衡量软件系统的最常见的两个指标. 延迟一般包括单向延迟(One-way Latency)和往返延迟(Round Trip Latency),实际测量时一般取往返延迟.它的单位一般是ms.s.min.h等. 而吞吐量一般指相当一段时间内测量出来的系统单位时间处理的任务数或事务数(TPS).注意“相当一段时间”,不是几秒,而可能是十几分钟.半个小时.一天.几周甚至几月.它的单位一般是TPS.每单位时间写入磁盘的字节数等. 思考

Throughput,中文译作吞吐量.Latency,中文译作延迟.它们是衡量软件系统的最常见的两个指标. 吞吐量一般指相当一段时间内测量出来的系统单位时间处理的任务数或事务数(TPS).注意“相当一段时间”,不是几秒,而可能是十几分钟.半个小时.一天.几周甚至几月.它的单位一般是TPS.每单位时间写入磁盘的字节数等. 延迟一般包括单向延迟(One-way Latency)和往返延迟(Round Trip Latency),实际测量时一般取往返延迟.它的单位一般是ms.s.min.h等. 我们应

转自:https://blog.cloudflare.com/the-story-of-one-latency-spike/ A customer reported an unusual problem with our CloudFlare CDN: our servers were responding to some HTTP requests slowly. Extremely slowly. 30 seconds slowly. This happened very rarely an

数据库调优工作中,有一部分是需要排查IO问题的,例如IO的速度或者RAID级别无法响应高并发下的快速请求.最常见的就是查看磁盘每次读写的响应速度,通过性能计数器Avg.Disk sec/Read(Write)我们可以很直观的看到他们.不同的业务,繁忙程度也不同,需要什么样的IO做支撑?难道都用最高配的IO去配置硬件吗?能否通过一些经验和基线来判断当下磁盘环境是否能满足需求呢? 手上有4块 Inter SSD DC S3500 Series 600GB硬盘做成的RAID1两组,我们就拿它来练练手吧

http://www.ageofascent.com/asp-net-core-exeeds-1-15-million-requests-12-6-gbps/ ASP.NET Core – Exceeds 1.15 Million request/s, 12.6 Gbps Congratulations to ASP.NET Core and .NET Core teams and the Open Source .NET community for quite a milestone in p

水平扩展和垂直扩展: Horizontal and vertical scaling Methods of adding more resources for a particular application fall into two broad categories: horizontal and vertical scaling.[5] To scale horizontally (or scale out/in) means to add more nodes to (or remove

此文是根据赵磊在[QCON高可用架构群]中的分享内容整理而成.转载请事先联系赵磊及相关编辑. 赵磊,Uber高级工程师,08年上海交通大学毕业,曾就职于微软,后加入Facebook主要负责Messenger的后端消息服务.这个系统在当时支持Facebook全球5亿人同时在线.目前在Uber负责消息系统的构建并推进核心服务在高可用性方向的发展. 前言 赵磊在7月21号的全球架构师峰会深圳站上,做了主题演讲:Uber高可用消息系统构建,对于这个热门主题,高可用架构群展开了热议,大家对分布式系统中的各

Welcome back!    This post deals with the second half of pixel processing, the “join phase”. The previous phase was all about taking a small number of input streams and turning them into lots of independent tasks for the shader units. Now we need to

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At this point, we’ve sent draw calls down from our app all the way through various driver layers and the command processor; now, finally we’re actually going to do some graphics processing on it! In this part, I’ll look at the vertex pipeline. But be

by Henry Robinson, April 26, 2010 The 'CAP' theorem is a hot topic in the design of distributed data storage systems. However, it's often widely misused. In this post I hope to highlight why the common 'consistency, availability and partition toleran

原文地址: https://software.intel.com/en-us/articles/enhancing-the-scalability-of-memcached-0 1 Introduction - Memcached and Web Services Memcached is a Key-Value cache used by cloud and web service delivery companies, such as Facebook [1], Twitter [2], R

http://blog.packagecloud.io/eng/2016/06/22/monitoring-tuning-linux-networking-stack-receiving-data/ Jun 22, 2016 • packagecloud Tags: packagecloud linux kernel networking optimization tuning monitoring TL;DR This blog post explains how computers runn

原文:SQL Server 服务器磁盘测试之SQLIO篇 数据库调优工作中,有一部分是需要排查IO问题的,例如IO的速度或者RAID级别无法响应高并发下的快速请求.最常见的就是查看磁盘每次读写的响应速度,通过性能计数器Avg.Disk sec/Read(Write)我们可以很直观的看到他们.不同的业务,繁忙程度也不同,需要什么样的IO做支撑?难道都用最高配的IO去配置硬件吗?能否通过一些经验和基线来判断当下磁盘环境是否能满足需求呢? 手上有4块 Inter SSD DC S3500 Series

1. Graylog2 简介 Graylog 是一个简单易用.功能较全面的日志管理工具,相比 ELK 组合, 优点: 部署维护简单,一体化解决方案,不像ELK三个独立系统集成. 查相比ES json语法,搜索语法更加简单,如 source:mongo AND reponse_time_ms:>5000. 内置简单的告警. 可以将搜索条件导出为 json格式文本,方便开发调用ES rest api搜索脚本. 自己开发采集日志的脚本,并用curl/nc发送到Graylog Server,发送格式是自

Cloudera recently announced formal support for Apache Kafka. This simple use case illustrates how to make web log analysis, powered in part by Kafka, one of your first steps in a pervasive analytics journey. If you are not looking at your company’s o

This chapter describes how to use NGINX and NGINX Plus as a load balancer. Overview Load balancing across multiple application instances is a commonly used technique for optimizing resource utilization, maximizing throughput, reducing latency, and en

这个文章与 Oracle 的 Hotspot JVM 虚拟机的内存管理为参照的.这些建议是我们在对大的 Confluence 安装实例用户进行咨询服务的时候得到的最佳配置方案. 请不要在 Confluence 中使用 Concurrent Mark Sweep (CMS) ,除非你得到了 Atlassian 支持小组的明确说明.这个需要额外的手工调整和测试,通常这个会降低系统的性能. 使用一个小的 heap 在不出现 OutOfMemory 错误的情况下,保持你的 heap 尽可能的小.当你遇到

转自:https://zeebe.io/what-is-zeebe/ Zeebe is a workflow engine for microservices orchestration. This write-up will help you understand exactly what Zeebe is and how it might be relevant to you. We’ll start with a short introduction of Zeebe and the pr

Due to high design and test costs for real many-core chips, simulators which allow exploring the best design options for a system before actually building it have been becoming highly necessary in system design and optimization flows. Packets are rou

Oracle Real Application Clusters (RAC) databases form an increasing proportion of Oracle database systems. RAC was introduced in 2001 as part of Oracle 9i and was based on Oracle's earlier Oracle Parallel Server architecture. RAC is almost unique as