GCeasy: 让天下没有难懂的GC日志

GC日志在线分析神器

导言

Java虚拟机（JVM）的垃圾回收（GC）不仅关系到内存资源的有效管理，更对业务性能产生着深远影响。

GC日志作为诊断JVM性能问题的关键信息源，常详尽且复杂，涉及大量的专业术语和技术细节，如堆内存划分、GC算法选择、停顿时间等，让许多开发者望而却步。今天介绍的神器，让人人都可以成为GC分析的专家。

一句话介绍

gceasy.ycrash.cn/

业内首款借助机器学习技术引导的垃圾回收日志分析工具。

官方宣传语

GCeasy 采用了先进的机器学习算法，可节省处理晦涩 GC 日志的时间，免除烦恼。可迅速发现内存泄漏、长时间 GC 停顿、过早的对象晋升以及许多其他影响性能的问题。

使用说明

就像怎么把一头大象装进冰箱一样简单，唯一的区别就是大象装不进去，而GC日志分析真的成功了：

1. 打开（或登录）网站
2. 上传你的gc日志文件
3. 点击【分析】按钮，等着下载报告就好了

原始的gc日志信息,截取一小部分展示：

2024-01-30T15:13:31.868+0800: 2.446: Total time for which application threads were stopped: 0.0002442 seconds, Stopping threads took: 0.0000703 seconds
2024-01-30T15:13:31.895+0800: 2.473: Total time for which application threads were stopped: 0.0002619 seconds, Stopping threads took: 0.0000670 seconds
2024-01-30T15:13:31.927+0800: 2.505: Total time for which application threads were stopped: 0.0002521 seconds, Stopping threads took: 0.0000770 seconds
2024-01-30T15:13:31.945+0800: 2.523: Total time for which application threads were stopped: 0.0008906 seconds, Stopping threads took: 0.0000898 seconds
2024-01-30T15:13:31.948+0800: 2.525: Total time for which application threads were stopped: 0.0004917 seconds, Stopping threads took: 0.0000535 seconds
2024-01-30T15:13:32.109+0800: 2.687: Total time for which application threads were stopped: 0.0003930 seconds, Stopping threads took: 0.0001287 seconds
2024-01-30T15:13:32.110+0800: 2.687: [GC (CMS Initial Mark) [1 CMS-initial-mark: 0K(1398144K)] 402692K(2027264K), 0.0868110 secs] [Times: user=0.08 sys=0.00, real=0.09 secs] 
2024-01-30T15:13:32.197+0800: 2.774: Total time for which application threads were stopped: 0.0870775 seconds, Stopping threads took: 0.0001423 seconds
2024-01-30T15:13:32.197+0800: 2.774: [CMS-concurrent-mark-start]
2024-01-30T15:13:32.197+0800: 2.775: [CMS-concurrent-mark: 0.000/0.000 secs] [Times: user=0.01 sys=0.00, real=0.00 secs] 
2024-01-30T15:13:32.197+0800: 2.775: [CMS-concurrent-preclean-start]
2024-01-30T15:13:32.199+0800: 2.777: [CMS-concurrent-preclean: 0.002/0.002 secs] [Times: user=0.01 sys=0.00, real=0.00 secs] 
2024-01-30T15:13:32.199+0800: 2.777: [CMS-concurrent-abortable-preclean-start]

下面是一份gc日志分析报告开头的样子：

当然，这是一个健康的状态，但是仍然给了你一些优化建议，这就可以算作对GC问题开的药方。如果你去体检结果非常健康，报告上也会告诉你多吃蔬菜少喝酒一样的道理。

报告中的内容非常详实，还包括以下内容：

• 概览
• 建议
• JVM内存大小
• 关键性能指标
• 交互图表
• GC时间
• 内存泄露
• 连续Full GC
• JVM参数

More

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