顶级程序猿手把手教你Java性能优化

逃离我推掉我的手 2024-03-26 12:33 64阅读 0赞

来了唯品会一年多，不少时间花在与服务化框架、业务应用的性能的缠斗上。 前几天正好趁着中生代技术的十月十城技术沙龙，把脑海中关于性能优化的记忆全部理了一遍....讲完回家，又本着认真严谨的态度再理了一遍，终于成为现在这份66页的PPT。 范围 应用性能，受操作系统参数，三方类库选择，数据库查询，甚至压测工具如JMeter本身调优的影响。 本次分享只着重在三方面：

*  JVM的调优
 *  代码的调优
 *  定位性能问题的工具

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基本原则 网上如此多新旧不一的资料，这么多肆意传播亦真亦错的观点，怎么办呢？

1.  多看一些靠谱的资料，问一些靠谱的人。
2.  怀疑一切，微基准测试一切，诚意推荐JMH。
3.  看JDK代码，看一切代码。

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JVM优化 首先，JIT入门知识； 然后，JVM参数的简介； 再然后，最头痛的GC问题的处理。

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x代码优化 代码优化，两大方向： 一是面向GC的编程， 二是并发与锁， 然后再来聊聊其他。

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问题定位工具集 黑盒调优是最不可靠的，推荐线下用JMC，线上用BTrace定位问题。

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