asmhatre/zgc-jdk25-benchmarks
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Add jdk28-zgc: ZGC startup and warmup baseline on JDK 25/27/28-ea, and a probe for JEP 545/546

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Spring Boot 4.1.1 harness measuring first-response time versus initial heap size and a
20,000-request warmup. Shows -XX:+ZAdaptiveHeapSizing is not yet in any build.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01WzVQ6zFh9cuLPj9RSbRH8U
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asmhatre
2026-10-12 17:13:14 +00:00
co-authored by Claude Sonnet 5.5
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README.md
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@@ -73,6 +73,7 @@ the part most "ZGC is faster" posts leave out.
| [`jmh/`](jmh/src/main/java/com/ankurm/zgc/jmh) | Throughput and barrier microbenchmarks | JMH 1.37 |
| [`jdk27-memory/`](jdk27-memory) | Spring Boot 4.1 service measured on JDK 25, 26 and 27: compact object headers (JEP 534) and G1 everywhere (JEP 523), heap footprint, container sizing with real cgroup limits. Its README and `output/` replace a `docs/` folder; the write-up is [the post](https://ankurm.com/jdk-27-compact-object-headers-g1-default-memory-spring-boot/) | Spring Boot 4.1.1, three JDKs |
| [`flags/`](flags) | The flag-by-flag production cheat sheet: `MaxRAMPercentage` vs a hardcoded `-Xmx` (one fails safely, one gets the container SIGKILLed), `-XX:-UseContainerSupport`, the `ActiveProcessorCount` lie, and which diagnostic flags (`HeapDumpOnOutOfMemoryError`, `NativeMemoryTracking`) are worth leaving on in prod — on real Docker containers, JDK 25 and JDK 27. Its README and `docs/output/` replace a `docs/` folder; the write-up is [the post](https://ankurm.com/jvm-flags-for-spring-boot-in-containers-jdk-25-27/) | Spring Boot 4.1.1, Docker, two JDKs |
| [`jdk28-zgc/`](jdk28-zgc) | ZGC startup and warmup versus initial heap size on JDK 25, 27 and 28 early access with a Spring Boot 4.1.1 server, plus a probe showing that JEP 545/546's `-XX:+ZAdaptiveHeapSizing` is not in any build yet. Its README and `output/` replace a `docs/` folder; the write-up is [the post](https://ankurm.com/zgc-jdk-28-adaptive-heap-sizing-faster-startup/) | Spring Boot 4.1.1, three JDKs |
### JMH benchmarks