C1 — 2 Technical Articles

Dec 3, 2023 · Backend Development

Why Your Java App’s CPU Spikes: Mastering C1/C2 JIT Threads

This article explains how HotSpot's C1 and C2 JIT compiler threads work, why they can consume excessive CPU, and provides practical JVM tuning options—including tiered compilation, code‑cache sizing, and compiler‑thread adjustments—to mitigate performance issues.

C1C2HotSpot

0 likes · 11 min read

Why Your Java App’s CPU Spikes: Mastering C1/C2 JIT Threads

Big Data Technology & Architecture

Oct 22, 2020 · Fundamentals

Understanding Implicit Null Checks and Null Eliminator Optimizations in the Java JVM

This article explains Java's explicit null checks, introduces the JVM's implicit null check mechanism via ImplicitNullCheckStub, and details how the C1 and C2 compilers perform null‑check elimination using data‑flow analysis and SSA, highlighting performance implications and optimization strategies.

C1C2Compiler Optimization

0 likes · 9 min read

Understanding Implicit Null Checks and Null Eliminator Optimizations in the Java JVM