[{"data":1,"prerenderedAt":77},["ShallowReactive",2],{"term-j\u002Fjit-warmup":3,"related-j\u002Fjit-warmup":59},{"id":4,"title":5,"acronym":6,"body":7,"category":40,"description":41,"difficulty":42,"extension":43,"letter":44,"meta":45,"navigation":46,"path":47,"related":48,"seo":53,"sitemap":54,"stem":57,"subcategory":6,"__hash__":58},"terms\u002Fterms\u002Fj\u002Fjit-warmup.md","JIT Warmup",null,{"type":8,"value":9,"toc":33},"minimark",[10,15,19,23,26,30],[11,12,14],"h2",{"id":13},"eli5-the-vibe-check","ELI5 - The Vibe Check",[16,17,18],"p",{},"A JIT compiler starts out running your code the slow, simple way, an interpreter, while it quietly watches which parts get called the most. Once it's confident a piece of code is hot, it compiles that specific part down to fast machine code on the fly. JIT warmup is that awkward in-between period where your program is slower than it will eventually be, because the compiler hasn't finished figuring out what deserves the expensive optimization treatment yet.",[11,20,22],{"id":21},"real-talk","Real Talk",[16,24,25],{},"JIT warmup is the period after a program starts during which a just-in-time compiler is still profiling code execution and progressively recompiling frequently executed methods into optimized machine code, meaning performance is measurably worse than the program's steady state. This is why benchmarks on JIT-compiled languages like Java, C#, or JavaScript's V8 engine must discard early iterations, and why short-lived processes like serverless functions suffer disproportionately from JIT overhead they never get to amortize.",[11,27,29],{"id":28},"when-youll-hear-this","When You'll Hear This",[16,31,32],{},"\"The first thousand requests were slow, that was just JIT warmup, throughput climbed after that.\" \u002F \"Serverless cold starts are painful partly because you eat JIT warmup on every fresh instance.\"",{"title":34,"searchDepth":35,"depth":35,"links":36},"",2,[37,38,39],{"id":13,"depth":35,"text":14},{"id":21,"depth":35,"text":22},{"id":28,"depth":35,"text":29},"languages","A JIT compiler starts out running your code the slow, simple way, an interpreter, while it quietly watches which parts get called the most.","advanced","md","j",{},true,"\u002Fterms\u002Fj\u002Fjit-warmup",[49,50,51,52],"Cold Start","Escape Analysis","Benchmarking","Garbage Collection",{"title":5,"description":41},{"changefreq":55,"priority":56},"weekly",0.7,"terms\u002Fj\u002Fjit-warmup","vR-Sg0lWMn5Jw28T-NCbIGMZV7HouvrWovPQAyYrXNQ",[60,65,69,72],{"title":51,"path":61,"acronym":6,"category":62,"difficulty":63,"description":64},"\u002Fterms\u002Fb\u002Fbenchmarking","backend","intermediate","Benchmarking is timing your code to prove it's actually fast, and it is shockingly easy to do wrong.",{"title":49,"path":66,"acronym":6,"category":67,"difficulty":63,"description":68},"\u002Fterms\u002Fc\u002Fcold-start","cloud","A cold start is the delay you get when a serverless function hasn't been used for a while and the cloud needs to spin up a fresh container to run it.",{"title":50,"path":70,"acronym":6,"category":40,"difficulty":42,"description":71},"\u002Fterms\u002Fe\u002Fescape-analysis","Escape analysis is a compiler playing detective, trying to prove that an object you allocated never actually escapes the function it was created in, meanin...",{"title":52,"path":73,"acronym":74,"category":75,"difficulty":63,"description":76},"\u002Fterms\u002Fg\u002Fgarbage-collection","GC","general","Garbage collection is your programming language's automatic cleanup crew. When you create variables and objects, they take up memory.",1792528093401]