SOFTWARE ARCHITECT AND INDEPENDENT TECHNICAL TRAINER
Context and Motivation The current article describes a series of Java Virtual Machine (JVM) Just In Time (JIT) Compilers benchmarks and their results, relying on different optimization patterns. For the current issue I included only two compilers: HotSpot C1/C2 JIT HotSpot Graal JIT In the future, I might extend it to Eclipse OpenJ9, Azul Zing, and…
Motivation In the current post, I would like to investigate how megamorphic call-sites are optimized in Kotlin as a result of explicit inlining (using the explicit inline modifier) and what is the performance gain out of it. The idea crossed my mind while I was reading the official kotlinlang.org website which mentions “inlining may cause the generated…
Motivation Current post tackles the problem of chaining (or linking) multiple lambda calls which seem to be differently optimized by the HotSpot Just In Time Compiler C2 (i.e. JIT C2) and GraalVM JIT Compiler. In this regard, I would propose to start detailing the problem, to run and check the benchmark results, to find…
According to the licensing policy, I would like to mention this article was originally published on InfoQ. Key Takeaways Creating and maintaining architectural diagrams to provide accurate and valuable content is not easy. Most of the time we create either too much, too little or irrelevant documentation because we fail to identify the proper beneficiaries and…
Software Architect is a person who draws the initial baby sketches, proves the prototype is working and then considers his job done. Developer can never estimate how much time it takes in practice to deliver the baby. Test Engineer is a person who thinks this is not the right baby. UX Researcher usually needs…
Motivation The problem I would like address affects the performance in case this::method reference is passed to another method (especially within a long running loop), hence it is important to be aware and avoid this situation. The problem This arises when a lambda or a method reference which captures this reference (e.g. this::method) is passed to…
Context Improving the performance of contended Java object monitors was added in JDK 9 as part of the JEP 143. However, as JEP 143 states, it might not be an overall performance gain on every benchmark or every test, but rather it explores few areas related to contended Java monitors, as per below: Fast Java…
Context StackWalker API has been introduced in JDK 9 as part of JEP 259. It targets a flexible mechanism to traverse and materialize the required stack frames allowing efficient lazy access to additional stack frames when required. Before this API (i.e. until JDK 9), there were a few other options to traverse the thread’s stack,…
Motivation At the first glance these two things (e.g. getting the stack traces and throwing an exception) might seem very unrelated, however, they are quite similar up to a certain extent in the way they behave under the hood. Current article aims to reveal such similarities and differences. A closer look inside Thread::getStackTrace API If…
Motivation Current article aims to reveal how Compact Strings feature added in JDK 9 with JEP 254 behaves in case of applications where the Strings are predominant UTF-16. Context As you might now, in JDK 9 the internal representation of the String class has changed from a UTF-16 char[] array to a byte[] array plus…