Fix JVM GC Pauses Spiking Application Latency
The JVM's Garbage Collector GC is aggressively collecting, causing long pauses that directly spike your application's latency.
JVM Articles
48 articles
GraalVM Native Image: Build Instant-Start JVM Apps
GraalVM Native Image can build applications that start faster than traditional JVM applications because it performs ahead-of-time AOT compilation, elimi.
JVM Heap Structure: Young, Old, Metaspace Explained
JVM Heap Structure: Young, Old, Metaspace Explained — practical guide covering jvm setup, configuration, and troubleshooting with real-world examples.
JVM Heap Dump Analysis: Find Leaks with Eclipse MAT
The surprising truth about JVM heap dumps is that they're not just a snapshot of memory; they're a detailed forensic record that can pinpoint the exact .
JVM Interview Questions: Senior Engineer Deep Dives
The JVM's garbage collector doesn't actually "free" memory; it reclaims objects that are no longer reachable, making their memory available for reuse.
JVM Intrinsics: Methods the JIT Compiles to CPU Instructions
JVM intrinsics are methods the Just-In-Time JIT compiler can translate directly into specialized CPU instructions, bypassing Java bytecode entirely.
JVM InvokeDynamic: How Lambdas Work Under the Hood
Lambdas are closures, which means they capture their surrounding state, but they don't actually capture anything in the traditional sense.
JVM JIT Compilers: C1, C2, and Graal Explained
The Java Virtual Machine's Just-In-Time JIT compilers are the unsung heroes of Java performance, and they don't just compile your code once; they can co.
JVM Lock Elision: When the JIT Removes Synchronization
The JVM's Just-In-Time JIT compiler can sometimes eliminate synchronization primitives entirely, even when they appear to be present in your bytecode, b.
JVM Loop Vectorization: Unlock SIMD Performance
The JVM can automatically vectorize loops, meaning it can execute multiple iterations of a loop in parallel using SIMD Single Instruction, Multiple Data.
Fix JVM Memory Leaks: Root Cause Analysis Guide
The JVM's garbage collector is failing to reclaim memory because an object that should no longer be referenced is still being held onto by an unexpected.
JVM Memory Model: Happens-Before for Concurrent Code
The JVM's memory model doesn't actually guarantee that a write in one thread is visible to another thread immediately, even if you use volatile or locks.
JVM Monitoring: Diagnose with jcmd, jstat, jmap
JVM Monitoring: Diagnose with jcmd, jstat, jmap The JVM's garbage collector is often the silent performance killer, and understanding its behavior is ke.
JVM Native Memory Tracking: Monitor Off-Heap Usage
JVM Native Memory Tracking is a surprisingly powerful tool for understanding where your Java application is secretly leaking memory, often in places the.
JVM Object Headers: Understand Memory Layout Overhead
A JVM object header is the first 8 or 16 bytes of any object, and it’s surprisingly complex. Let's see what's actually in there
JVM Off-Heap Memory: Allocate Outside GC Control
The JVM's garbage collector doesn't actually control all memory used by your Java process. Let's say you're building a high-performance caching system
JVM Compressed OOPs: Save Memory on 64-bit Heaps
JVM Compressed OOPs: Save Memory on 64-bit Heaps — practical guide covering jvm setup, configuration, and troubleshooting with real-world examples.
JVM Panama and Valhalla: What's Coming to Java
The JVM's upcoming Panama and Valhalla projects are poised to fundamentally reshape how Java handles low-level system interaction and data representatio.
JVM Performance Flags: Every -XX Option That Matters
The JVM's performance flags, prefixed with -XX:, aren't just knobs to twiddle; they're direct instructions to the Java runtime about how to manage its c.
JVM Performance Regression: Detect Slowdowns in CI
JVM Performance Regression: Detect Slowdowns in CI — practical guide covering jvm setup, configuration, and troubleshooting with real-world examples.
JVM Production Hardening: 30-Point Checklist
The most surprising thing about JVM production hardening is how much of it is about not doing things, rather than adding new configurations.
JVM Safepoints and Biased Locking Explained
The JVM doesn't actually pause your entire application at "safepoints" to do its work; it asks threads to reach a safepoint on their own, which is a sur.
JVM Security Manager: Migration Path After Removal
The JVM Security Manager, once a bastion of fine-grained access control, is effectively dead in modern Java versions, but its legacy continues to haunt .
JVM Stack Frames: Understand Local Variable Tables
A JVM stack frame is a surprisingly mutable data structure that gets rebuilt constantly as your program runs, not a static snapshot.
JVM Startup Time: Cut Cold Start from Seconds to Milliseconds
JVM startup time, especially for short-lived, frequently invoked functions, is often a bottleneck that’s surprisingly easy to optimize.
JVM String Deduplication: Reduce Heap by 10-30%
JVM String Deduplication, a feature introduced in Java 8u20, can slash your heap usage by 10-30% by identifying and merging identical String objects.
JVM Thread Dumps: Diagnose Deadlocks and Contention
A JVM thread dump is the closest you'll get to a snapshot of your application's soul, revealing not just what threads are doing, but why they're stuck.
JVM Threads: How JVM Threads Map to OS Threads
The JVM doesn't really have threads in the way you're thinking; it has lightweight objects that represent threads, and those representations are multipl.
JVM Tiered Compilation: How Code Gets Optimized
The JVM's tiered compilation is a sophisticated system that dynamically optimizes Java code by compiling it at different levels of aggressiveness based .
JVM in Docker/K8s: Tune Heap for Container Limits
The JVM heap size in a containerized environment like Docker or Kubernetes often causes more trouble than it's worth because the default JVM heap settin.
JVM ZGC vs Shenandoah: Low-Latency GC Compared
The most surprising thing about modern garbage collectors like ZGC and Shenandoah is that they achieve near-zero pause times not by being "faster" at co.
JVM Architecture: Every Component Explained Deeply
JVM Architecture: Every Component Explained Deeply. The JVM doesn't just run Java code; it actively rewrites it on the fly to be as fast as possible.
JVM Async Profiler: Find CPU Hotspots in Production
JVM Async Profiler is a powerful tool for identifying performance bottlenecks in Java applications. Let's see it in action
JVM JMH Benchmarking: Measure Code Performance Accurately
JMH is designed to isolate code execution so effectively that it can sometimes measure the overhead of not running your code.
JVM Bytecode: Read and Understand Class Instructions
JVM bytecode isn't just a lower-level version of Java; it's a highly optimized stack-based instruction set designed for efficient execution and portabil.
JVM Class Data Sharing: Cut Startup Time Dramatically
JVM Class Data Sharing CDS can slash application startup times by up to 50% by pre-processing and sharing class metadata across JVM instances.
JVM Class Loading: Bootstrap, System, App Classloaders
The JVM’s classloaders don’t just load classes; they actually decide which version of a class to use when multiple are available, and that decision is a.
Fix JVM ClassLoader Memory Leaks in Production
The JVM's ClassLoader subsystem is failing to unload classes, leading to an out-of-memory error because the garbage collector can't reclaim the memory o.
JVM Constant Pool: What Lives in Every .class File
The JVM constant pool is the single most misunderstood part of a Java class file, often mistaken for a simple lookup table when it's actually a dynamic,.
JVM CPU Cache: Write Cache-Friendly Java Code
Java code can often be written to be more cache-friendly, and it's not about obscure compiler flags or processor-specific intrinsics.
JVM Remote Debugging: Debug Production Without Restart
JVM remote debugging lets you attach a debugger to a running Java process, even on a production server, without stopping or restarting it.
JVM Ergonomics: How the JVM Auto-Tunes Itself
The JVM's "ergonomics" aren't about making the JVM comfortable for developers; they're about making it performant without developer intervention.
JVM Escape Analysis: Eliminate Heap Allocations
Escape analysis is a compiler optimization that determines if an object created within a method is only used locally and can therefore be allocated on t.
JVM False Sharing: Fix Cache Line Contention Issues
JVM false sharing is when unrelated data structures on different threads happen to reside on the same CPU cache line, causing performance degradation.
JVM Flight Recorder: Zero-Overhead Production Profiling
JVM Flight Recorder JFR is a tool that lets you profile your Java application with virtually no performance impact, even in production.
JVM G1GC Tuning: Reduce Pause Times in Production
The Garbage First G1 Garbage Collector in the JVM is designed to provide predictable pause times, but achieving that in production often means understan.
JVM GC Comparison: G1, ZGC, Shenandoah, Serial
The JVM's garbage collectors aren't just about freeing memory; they're about fundamentally controlling how your application's threads interact with the .
JVM GC Logs: Parse and Diagnose Garbage Collection
You probably thought JVM GC logs were just a stream of incomprehensible text, but they’re actually a highly detailed, real-time diagnostic log of how yo.