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Java 27 and 26: runnable demos and captured output for every JEP, plus version lanes

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Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
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asmhatre
2026-09-21 15:08:50 +00:00
committed by Claude
co-authored by Claude Sonnet 5
commit f59c1de96d
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docs/output/06-g1-tuning-1cpu.txt
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# JDK 27, G1 (the default), 1 CPU / 2 GB container, 400 batches, 2 runs per configuration
=== flags that differ between 26 and 27 (from -XX:+PrintFlagsFinal)
--- amazoncorretto:26
uint ConcGCThreads = 0 {product} {default}
uintx MaxHeapFreeRatio = 70 {manageable} {default}
size_t MaxHeapSize = 536870912 {product} {ergonomic}
uintx MinHeapFreeRatio = 40 {manageable} {default}
uint ParallelGCThreads = 0 {product} {default}
bool UseCompactObjectHeaders = false {product lp64_product} {default}
bool UseCompressedClassPointers = true {product} {default}
--- amazoncorretto:27
uint ConcGCThreads = 1 {product} {ergonomic}
uint G1IHOP = 45 {product} {default}
uintx MaxHeapFreeRatio = 100 {manageable} {default}
size_t MaxHeapSize = 536870912 {product} {ergonomic}
uintx MinHeapFreeRatio = 0 {manageable} {default}
uint ParallelGCThreads = 1 {product} {default}
bool UseCompactObjectHeaders = true {product lp64_product} {default}
=== amazoncorretto:27 flags: [none]
wall time = 1064 ms
gc count / time = 26 / 208 ms
peak RSS = 492 MB
wall time = 1078 ms
gc count / time = 26 / 202 ms
peak RSS = 493 MB
=== amazoncorretto:27 flags: [-XX:MinHeapFreeRatio=40 -XX:MaxHeapFreeRatio=70]
wall time = 1115 ms
gc count / time = 26 / 268 ms
peak RSS = 492 MB
wall time = 982 ms
gc count / time = 26 / 199 ms
peak RSS = 492 MB
=== amazoncorretto:27 flags: [-Xmx256m]
wall time = 976 ms
gc count / time = 37 / 240 ms
peak RSS = 294 MB
wall time = 957 ms
gc count / time = 37 / 261 ms
peak RSS = 294 MB