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Add compact-strings module: Compact Strings (JEP 254) measured with JOL on JDK 25, with and without -XX:-CompactStrings, and compact object headers on 25 vs 27

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01KqJyCidz3ZgRyHABv2GVJh
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asmhatre
2026-10-01 04:23:27 +00:00
co-authored by Claude Sonnet 5.5
parent fadfd05670
commit fc05eed4b5
26 changed files with 943 additions and 0 deletions
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compact-strings/output/21-flags.txt
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$ java -XX:+PrintFlagsFinal -version | grep -E 'CompactStrings|CompactObjectHeaders' (JDK 25)
bool CompactStrings = true {pd product} {default}
bool UseCompactObjectHeaders = false {product lp64_product} {default}
$ java -XX:-CompactStrings -version (JDK 25)
openjdk version "25.0.4.1" 2026-08-18 LTS
OpenJDK Runtime Environment Temurin-25.0.4.1+1 (build 25.0.4.1+1-LTS)
OpenJDK 64-Bit Server VM Temurin-25.0.4.1+1 (build 25.0.4.1+1-LTS, mixed mode)
$ java -XX:+PrintFlagsFinal -version | grep -E 'CompactStrings|CompactObjectHeaders' (JDK 27)
bool CompactStrings = true {pd product} {default}
bool UseCompactObjectHeaders = true {product lp64_product} {default}
$ java -XX:-CompactStrings -version (JDK 27)
openjdk version "27" 2026-09-15
OpenJDK Runtime Environment Corretto-27.0.0.35.1 (build 27+35-FR)
OpenJDK 64-Bit Server VM Corretto-27.0.0.35.1 (build 27+35-FR, mixed mode)