مُترجم JIT والإحماء (Warm-up)

في هذا الدرس

explain why performance changes after startup.

الموضوعات المخطط لها

• The JVM starts by interpreting; it counts method calls and loop iterations.
• Tiered compilation: C1 compiles quickly with light optimization; C2 compiles hot code with heavy optimization.
• C2 uses profile data (inlining, escape analysis) and can deoptimize if its assumptions break.
• Result: first requests are slow, later ones fast. This is warm-up.
• Benchmarking cold code measures startup, not steady state.