https://tsvinc.dev/tags/gc/ Recent content in Gc on tsvinc Hugo en-us Sun, 31 May 2026 00:00:00 +0000 https://tsvinc.dev/posts/every-gc-failed-256mb/ Sun, 31 May 2026 00:00:00 +0000 https://tsvinc.dev/posts/every-gc-failed-256mb/ <p>Monday: &ldquo;The JVM at 256 MB should work. Just need the right GC.&rdquo;</p> <p>Tuesday: G1GC. OOM at 150 concurrent users.</p> <p>Tuesday, later: Shenandoah. OOM at 50 concurrent users.</p> <p>Tuesday, even later: ZGC. OOM at zero concurrent users. Couldn&rsquo;t serve a single request.</p> <p>Wednesday: Serial GC with 7 JVM flags and 3 Micronaut properties. Survives 60 seconds before the OOM killer shows up anyway.</p> <h2 id="the-contenders">The Contenders</h2> <p>Same app: Micronaut 5.0.0 Space Observatory, 16 REST endpoints, reactive R2DBC, 7-table PostgreSQL schema. Container: 256 MB hard limit, swap disabled. Heap capped at 64 MB (<code>-Xms64m -Xmx64m</code>). Load: k6, ramping from 10 to 200 concurrent users over 8.5 minutes.</p>