System optimize experience

性能优化的几点经验

理解你的系统• 理解系统的所有细节 – 关键区域/关键资源 – 系统结构/流程 – 所有的库，以及它们的实现• 理解系统底层 – OS – DB – JVM

Profile Your Code• Critical resource (Lock, Connection Pool, etc.)• Waiting (Latency)• Work unit processed (Throughput)• 否则，在产品环境下调优很艰难

Monitor Your System(1)• System resource usage – CPU/disk/Network/Memory• System profile – Critical resource usage/racing – Latency – Though output

Monitor Your System(2)• Chart – Trend – History – Baseline• Tools – Cacti/Nagios(CPU/Mem/Disk, and Your System Profile ) – Excel/Gnuplot/Google Chart – Awk/Bash/Perl

小步前进• 多观察，缓动手• 划分处理流程，找七寸• 小幅改动，循序渐进 – 简单是真理，复杂会致命 – 控制• 知道何时停止

Tools• Cacti/Nagios (监控)• System utilities, top, etc.• Awk/Bash/Perl (分析日志)• Gnuplot/GoogleChart (画图)• Visual JVM

解决方式• 减少竞争/等待 – 分拆锁/分离锁/无锁 – 异步• 并行/池化/缓存• 集中读写 (IO经常是瓶颈)• 按功能分区 (解除关联，提高扩展性)

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System optimize experience

by Jeffrey Liu on May 12, 2011

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