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评估

难度
5/5
预计耗时
一周以上
新手友好度
15/100
Issue 类型
文档
描述清晰度
需要澄清
活跃度
冷清
技术栈
java, shell
领域
performance

调研方向

The issue contains benchmark results for JDK 25 and JDK 27 on an M1 MacBook Pro, including default and -Xms32m runs. No repository file, test, or entry point is named, and the issue does not define a change or acceptance criteria. Clarify whether the results should be documented, investigated, or used to create a benchmark regression test before starting.

由索引模型根据 Issue 内容生成。

描述

An issue to share results.

On my MacBook Pro M1, at commit 7b967ffe999f26cf2d8bd9783ad9574a120fafe1 using OpenJDK 64-Bit Server VM (build 25.0.3+11-LTS, mixed mode, sharing) and OpenJDK 64-Bit Server VM (build 27-ea+23-2078, mixed mode, sharing).

With otherwise default command-line options 

========================================
Running benchmarks for JDK 25
========================================
openjdk version "25.0.3" 2026-04-21 LTS
OpenJDK Runtime Environment (build 25.0.3+11-LTS)
OpenJDK 64-Bit Server VM (build 25.0.3+11-LTS, mixed mode, sharing)
Preparing AOT cache for JDK 25 (No COH)...
Preparing AOT cache for JDK 25 (With COH)...
Run 1/10... Done
Run 2/10... Done
Run 3/10... Done
Run 4/10... Done
Run 5/10... Done
Run 6/10... Done
Run 7/10... Done
Run 8/10... Done
Run 9/10... Done
Run 10/10... Done
========================================
Running benchmarks for JDK 27
========================================
openjdk version "27-ea" 2026-09-15
OpenJDK Runtime Environment (build 27-ea+23-2078)
OpenJDK 64-Bit Server VM (build 27-ea+23-2078, mixed mode, sharing)
Preparing AOT cache for JDK 27 (No COH)...
Preparing AOT cache for JDK 27 (With COH)...
Run 1/10... Done
Run 2/10... Done
Run 3/10... Done
Run 4/10... Done
Run 5/10... Done
Run 6/10... Done
Run 7/10... Done
Run 8/10... Done
Run 9/10... Done
Run 10/10... Done
========================================
Summary of runs
========================================
Configuration                   RSS (MB) Avg [Min, Max]         Startup (ms) Avg [Min, Max]
----------------------------------------------------------------------------------------
JDK 25 (AOT=false, COH=false)   150.70 [149, 155]               1015.80 [955, 1062]      
JDK 25 (AOT=false, COH=true)    149.90 [149, 153]               1011.50 [952, 1060]      
JDK 25 (AOT=true, COH=false)    117.50 [114, 120]               334.60 [293, 409]        
JDK 25 (AOT=true, COH=true)     120.80 [118, 122]               322.80 [289, 352]        
JDK 27 (AOT=false, COH=false)   182.10 [178, 189]               1010.00 [938, 1108]      
JDK 27 (AOT=false, COH=true)    183.50 [179, 187]               1052.30 [934, 1280]      
JDK 27 (AOT=true, COH=false)    122.90 [120, 125]               350.30 [313, 422]        
JDK 27 (AOT=true, COH=true)     126.00 [124, 128]               357.60 [331, 459]

  • With defaults (COH, no AOT), RSS increases from 151 MB to 182 MB (20.5%) from JDK 25 to 27 EA b23
With `-Xms32m` 

========================================
Running benchmarks for JDK 25
========================================
openjdk version "25.0.3" 2026-04-21 LTS
OpenJDK Runtime Environment (build 25.0.3+11-LTS)
OpenJDK 64-Bit Server VM (build 25.0.3+11-LTS, mixed mode, sharing)
Preparing AOT cache for JDK 25 (No COH)...
Preparing AOT cache for JDK 25 (With COH)...
Run 1/10... Done
Run 2/10... Done
Run 3/10... Done
Run 4/10... Done
Run 5/10... Done
Run 6/10... Done
Run 7/10... Done
Run 8/10... Done
Run 9/10... Done
Run 10/10... Done
========================================
Running benchmarks for JDK 27
========================================
openjdk version "27-ea" 2026-09-15
OpenJDK Runtime Environment (build 27-ea+23-2078)
OpenJDK 64-Bit Server VM (build 27-ea+23-2078, mixed mode, sharing)
Preparing AOT cache for JDK 27 (No COH)...
Preparing AOT cache for JDK 27 (With COH)...
Run 1/10... Done
Run 2/10... Done
Run 3/10... Done
Run 4/10... Done
Run 5/10... Done
Run 6/10... Done
Run 7/10... Done
Run 8/10... Done
Run 9/10... Done
Run 10/10... Done
========================================
Summary of runs
========================================
Configuration                   RSS (MB) Avg [Min, Max]         Startup (ms) Avg [Min, Max]
----------------------------------------------------------------------------------------
JDK 25 (AOT=false, COH=false)   150.90 [149, 154]               996.10 [967, 1035]       
JDK 25 (AOT=false, COH=true)    149.30 [142, 156]               1040.10 [985, 1238]      
JDK 25 (AOT=true, COH=false)    117.30 [115, 120]               308.20 [290, 325]        
JDK 25 (AOT=true, COH=true)     120.90 [118, 122]               329.20 [301, 360]        
JDK 27 (AOT=false, COH=false)   164.00 [153, 187]               1012.90 [958, 1046]      
JDK 27 (AOT=false, COH=true)    164.20 [150, 190]               1019.80 [949, 1098]      
JDK 27 (AOT=true, COH=false)    120.80 [120, 123]               339.50 [319, 401]        
JDK 27 (AOT=true, COH=true)     119.10 [117, 123]               332.00 [301, 388]

  • With -Xms32m and otherwise defaults (COH, no AOT), RSS increases from 151 MB to 164 MB (8.6%) from JDK 25 to 27 EA b23
主要语言
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环境准备

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从这里开始

  1. 先读完整个 Issue，再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库，在一个分支上完成修改。
  4. 提交 Pull Request，并在描述里引用这个 Issue 编号。

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