# JVM Internals Deep Dive 8-25 LTS

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Text version: https://stenobird.com/podcast/software-engineer-interview-prep-podcast-7756520/jvm-internals-deep-dive-8-25-lts.md
Podcast: [Software Engineer Interview Prep Podcast](https://stenobird.com/podcast/software-engineer-interview-prep-podcast-7756520)
Published: 2026-03-25T21:22:34+00:00
Episode link: https://podcasters.spotify.com/pod/show/prabuddha-ganegoda/episodes/JVM-Internals-Deep-Dive-8-25-LTS-e3gvm7a
Audio file: https://anchor.fm/s/10f2c0f8c/podcast/play/117479082/https%3A%2F%2Fd3ctxlq1ktw2nl.cloudfront.net%2Fstaging%2F2026-2-25%2F52f54a0d-c4bf-bb2e-06a9-510bd6e0fffa.m4a
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JSON: https://stenobird.com/v1/public/podcasts/software-engineer-interview-prep-podcast-7756520/episodes/jvm-internals-deep-dive-8-25-lts
Duration seconds: 3942

## Resource

JVM Architecture Overview — runtime data areas, memory model, flag reference table Class Loading Subsystem — delegation model, loading phases, JPMS/Jigsaw module system Execution Engine & JIT — tiered compilation levels (0→4), inlining, escape analysis, loop vectorisation, SIMD intrinsics, speculative optimisation and deoptimisation Garbage Collection Algorithms — deep dives on G1, ZGC (coloured pointers, load barriers, concurrent relocation), and Shenandoah; full comparison table across all collectors LTS-by-LTS Optimisation History: GC Configuration & Tuning — selection guide, essential flags, unified GC logging Monitoring & Profiling — JFR, jcmd/jstack/async-profiler, key production metrics Virtual Threads & Modern Concurrency — VT vs platform threads, migration checklist, StructuredTaskScope pattern Performance Tuning Playbook — symptom→root cause table, AppCDS, CRaC, GraalVM Native Evolution Timeline — Java 8→25 at a glance

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## Transcript

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