JDK21 and Bazel
summary
Bazel upgrades its embedded JVM to JDK 21 and reports microbenchmarks showing up to 20% CPU and 14% wall-time improvements on high-core machines and ~5–10% wall-time gains in production above the 50th percentile, attributed mainly to new GC. A prototype swaps platform threads for virtual threads to implement async execution: threads detach while waiting for subprocesses, reuse platform threads, drive thousands of concurrent actions with far fewer OS threads, and aim to remove manual jobs tuning by dynamically adjusting concurrency.
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