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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/12-million-jdk25-no-compact-strings.txt
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$ java -Xmx3g -XX:-CompactStrings MillionStrings (JDK 25)
java.version = 25.0.4.1
strings : 1,000,000 (average 42.50 chars)
coder == 0 (LATIN1) in set A : 0
coder == 1 (UTF16) in set B : 1,000,000
A: lower-case ASCII only : 131,995,184 bytes (132.0 MB, 132.0 bytes per string)
B: same + one euro sign : 133,839,824 bytes (133.8 MB, 133.8 bytes per string)
B / A : 1.014