Track Awesome Jvm Updates Daily

A curated list of awesome loosely performance related JVM stuff. Inspired by awesome-python.

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[ Daily / Weekly / Overview ]

Jul 12, 2018

Memory and concurrency

• DSL-JSON (⭐825) - High performance JSON library with advanced compile-time databinding.

• jsoniter - Claims to be the fastest JSON parser ever (copy of DSL-JSON).

Jul 07, 2018

Languages

• JPHP (⭐1.7k) - PHP on the Java VM.

Memory and concurrency

• RTree2D (⭐120) - RTree2D is a 2D immutable R-tree with STR (Sort-Tile-Recursive) packing for ultra-fast nearest and intersection queries on plane and spherical surfaces.

Virtual Machines

• MobiDevelop's RoboVM Fork (⭐776) - Ahead of time compiler for JVM bytecode targeting iOS, Mac OSX and Linux.

Apr 06, 2018

Profilers

• jvm-profiler (⭐1.7k) - Java Agent to collect various metrics and stacktraces for Hadoop/Spark JVM processes in a distributed way.

Mar 23, 2018

Garbage collectors

• Azul Pauseless Garbage Collection - Providing continuous, pauseless operation for Java applications.

Nix tools

• taskset/process-affinity - Retrieve or set a processes’s CPU affinity.

Profilers

• jfr-report-tool (⭐49) - Tool for creating reports from Java Flight Recorder dumps.

Documentation

• TCP Tracepoints Linux bcc/BPF using tcplife by Brendan Gregg

People

• Paul Phillips - Forever undisputed SLOC Scala compiler dev.

Mar 22, 2018

Profilers

• Byteman - tracing, monitoring and testing tool for Java

People

• Claes Redestad - Working with OpenJDK stuff @ Oracle.

• Ivan Krylov - JVM expert.

• Lukas Eder - Blogger. Author of JOOQ.

• Per Liden - Hacking on the HotSpot JVM at Oracle.

• Rafael Winterhalter - Author of ByteBuddy.

• Richard Startin - Performance Analyst, developer, blogger.

• Ron Pressler - Parallel Universe. Leading Fibers and Continuations for the JVM.

• Stephen Colebourne - Java Champion. Occasional blogger and speaker. Best known for Joda projects and JSR-310.

• Vladimir Ivanov - hacking HotSpot JVM @ Oracle.

Mar 16, 2018

Network

• Chronicle-Network (⭐223) - A High Performance Network library.

• one-nio (⭐573) - library for building high performance Java servers.

• proteus-java (⭐42) - Proteus Java Client based on RSocket.

Profilers

• micrometer (⭐3.6k) - An application metrics facade for the most popular monitoring tools.

Mar 01, 2018

Memory and concurrency

• Reactive Streams Utilities (⭐61) - Future standard utilities library for Reactive Streams.

Native

• Java Grinder (⭐392) - Compile Java bytecode to microcontroller assembly.

Media

• FOSDEM 2018 - FOSDEM 2018 Free Java devroom.

• JFokus 2018 - The GC edition. Shenandoah, ZGC, Zing, Fibers, Falcon etc.

Feb 14, 2018

Nix tools

• bcc (⭐16k) - Tools for BPF-based Linux IO analysis, networking, monitoring, and more.

Feb 09, 2018

Memory and concurrency

• mph-table (⭐91) - Minimal Perfect Hash Tables are an immutable key/value store with efficient space utilization and fast reads.

Network

• reactive-grpc (⭐754) - Reactive gRPC is a suite of libraries for using gRPC with Reactive Streams programming libraries.

Feb 07, 2018

Memory and concurrency

• splitmap (⭐18) - A parallel bitmap implementation.

Profilers

• bytestacks (⭐33) - Turn JVM bytecode execution into flame graphs.

Jan 24, 2018

Memory and concurrency

• externalsortinginjava (⭐230) - Sort very large files using multiple cores and an external-memory algorithm.

• fast-uuid (⭐136) - Java library for quickly and efficiently parsing and writing UUIDs.

Jan 12, 2018

Memory and concurrency

• mug - A small, zero-dep functional util library originating from Google.

Metaprogramming

• lombok - Reduce the amount of boilerplate code that is commonly written for Java classes.

Dec 29, 2017

Documentation

• Safepoints - Where is my safepoint? Nitsan Wakart.

• Quick Tips for Fast Code on the JVM - Daniel Spiewak.

Dec 24, 2017

Profilers

• osquery - osquery is an instrumentation framework that expose the operating system as a high-performance relational database.

Dec 20, 2017

Memory and concurrency

• VarInt (⭐20k) - No-deps variable int implementation without deps (by Bazel).

Nix tools

• ioping (⭐868) - Simple disk I/0 latency measuring tool.

Profilers

• GCeasy - Machine learning guided Garbage collection log analysis tool. Auto-detect problems in the JVM GC logs and recommend solutions to it.

Dec 16, 2017

Machine Learning

• Deeplearning4j - Open-Source, Distributed, Deep Learning Library for the JVM.

• H2O - Fast statistical, machine learning & math runtime.

• Smile (⭐5.6k) - Statistical Machine Intelligence & Learning Engine.

Dec 07, 2017

Documentation

• What every programmer should know about solid-state drives - Emmanuel Goossaert.

Media

• Which technique do programming language parsers and interpreters use? - Cliff Click.

People

• Andrey Breslav - Lead Language Designer of Kotlin @ JetBrains.

• Heinz Kabutz - Author of 250+ Java Specialists' Newsletters.

• Jake Wharton - Square, Google, open source hacker.

Nov 18, 2017

Garbage collectors

• Epsilon GC - Completely passive GC implementation with bounded allocation limit, and lowest runtime performance overhead possible.

Nov 13, 2017

Memory and concurrency

• Eclipse Collections (⭐2.1k) - Collections framework for Java.

• failsafe (⭐3.8k) - A lightweight, zero-dependency library for handling failures.

• injector (⭐59) - A new Executor for Java.

• java-concurrent-hash-trie-map (⭐146) - Java port of a concurrent trie hash map implementation from Scala collections.

• java-hll (⭐294) - Java library for the HyperLogLog algorithm.

• JavaFastPFOR (⭐478) - Library to compress and uncompress arrays of integers very fast.

Metaprogramming

• grappa (⭐62) - Java fork of Parboiled. Write grammars with no preprocessing phase.

Nov 10, 2017

Media

• Shenandoah: The Garbage Collector That Could - Aleksey Shipilev - Devoxx 2017/11

Nov 09, 2017

Media

• Cliff Click podcast 2017/09/16 - Programming and Performance Intro.

• Cliff Click podcast 2017/09/16 - Bugs and Coding Styles.

• Cliff Click podcast 2017/09/18 - Java vs C/C++.

• Cliff Click podcast 2017/09/21 - Debugging Data Races.

• Cliff Click podcast 2017/09/24 - Fast Bytecodes for Funny Languages.

• Cliff Click podcast 2017/09/28 - Struct of Arrays vs Array of Structs.

• Cliff Click podcast 2017/10/04 - The 3 Hardest Problems in Programming.

• Cliff Click podcast 2017/11/05 - Modern Hardware Performance and Cache Lines.

• Cliff Click podcast 2017/11/09 - Queuing In Practice.

Nov 02, 2017

Garbage collectors

• ZGC - Garbage collector optimized for low latency and very large heaps.

Profilers

• OpenTracing - A vendor-neutral open standard for distributed tracing.

Documentation

• Linux tracing workshop (⭐1.1k) - JVM monitoring with BPF, examples and hands-on labs for Linux tracing tools workshops.

Oct 11, 2017

Virtual Machines

• Eclipse OpenJ9 (⭐3k) - Eclipse OpenJ9.

Oct 06, 2017

Memory and concurrency

• streamvbyte (⭐270) - Fast integer compression in C using the StreamVByte codec.

Communities

• Virtual Machine Meetup 2017 - Venue for discussing the latest research and developments in the area of managed language execution.

Media

• Kernel Recipes 2017: Performance Analysis with BPF - Brendan Gregg.

• Shenandoah deep talk - Aleksey Shipilëv slightly-deeper-than-usual Shenandoah talk from Virtual Machine Meetup 2017.

• Everything about Stack Traces and Heap Dumps - Andrei Pangin.

• Fast and safe production monitoring of JVM with BPF tools - Sasha Goldshtein.

• The Future of the Linux Page Cache - Matthew Wilcox.

Sep 23, 2017

Memory and concurrency

• jOOL (⭐2k) - Useful extensions to Java 8 lambdas.

• wire (⭐3.9k) - Clean, lightweight protocol buffers for Android and Java.

Sep 22, 2017

Profilers

• grav (⭐280) - A collection of tools to help visualise process execution.

Aug 08, 2017

Documentation

• Linux Load Averages: Solving the Mystery - Brendan Gregg.

Aug 07, 2017

Network

• JXIO (⭐76) - Java API over AccelIO (C library), a high-performance asynchronous reliable messaging and RPC library optimized for hardware acceleration.

Aug 05, 2017

Media

• JVM Language Summit 2017 - JVM Language Summit 2017.

Jul 07, 2017

Profilers

• async-profiler (⭐5.5k) - Sampling CPU profiler for Java featuring AsyncGetCallTrace + perf_events.

Jun 08, 2017

Nix tools

• jhsdb - Launch a postmortem debugger to analyze the content of a core-dump from a crashed JVM.

May 30, 2017

Memory and concurrency

• java-string-similarity (⭐2.5k) - String similarity and distance measures, including Levenshtein edit distance and sibblings, Jaro-Winkler, Longest Common Subsequence, cosine similarity etc.

• vavr - Functional Library for Java 8+.

Network

• RSocket - RSocket is a binary protocol for use on byte stream transports such as TCP, WebSockets, and Aeron.

Documentation

• JVM Anatomy Park - mini-post series where every post goes deep for only a single topic by Aleksey Shipilёv.

May 29, 2017

Media

• G1 Garbage Collector in Java 8/9 - Kirk Pepperdine.

People

• Kirk Pepperdine - Working in high performance and distributed computing for nearly 20 years.

May 19, 2017

Media

• Analyzing and Debugging the Java HotSpot VM at the OS Level - Volker Simonis.

May 12, 2017

Memory and concurrency

• onyx-java (⭐5) - Mirrors the Onyx Platform core API by providing a Java equivalent for each component of an Onyx workflow.

May 10, 2017

Nix tools

• tiptop - Like top but also shows instructions per cycle (IPC).

Documentation

• CPU Utilization is Wrong - Measure instructions per cycle (IPC) for CPU utilization. Brendan Gregg.

Mar 27, 2017

Profilers

• jcstress - Experimental harness and tests to aid the research in the correctness of concurrency support in the JVM, class libraries, and hardware.

Mar 23, 2017

Garbage collectors

• The Garbage Collection Handbook - Book that addresses new challenges to garbage collection made by recent advances in hardware and software.

Memory and concurrency

• colfer (⭐678) - Binary serialization format and class generator.

Mar 21, 2017

Documentation

• Using JDK 9 Memory Order Modes - For expert programmers familiar with Java concurrency, but unfamiliar with the memory order modes available in JDK 9 provided by VarHandles.

Mar 09, 2017

Languages

• Eta - Pure, lazy, strongly typed functional programming language on the JVM.

Memory and concurrency

• TraneIO - High-performance implementation of the Future abstraction.

Feb 24, 2017

Memory and concurrency

• lmdbjni (⭐201) - Java API to LMDB (HawtJNI) which is an ultra-fast, ultra-compact key-value embedded data store written in C.

• lmdbjava (⭐673) - Java API to LMDB (JNR) which is an ultra-fast, ultra-compact key-value embedded data store written in C.

Feb 10, 2017

Memory and concurrency

• parquet - Columnar storage format that uses the record shredding and assembly algorithm described in the Dremel paper.

Feb 02, 2017

Memory and concurrency

• geohash (⭐380) - Java utility methods for geohashing.

Feb 01, 2017

Memory and concurrency

• hollow (⭐1.1k) - Java library and comprehensive toolset for harnessing small to moderately sized in-memory datasets.

Jan 28, 2017

Memory and concurrency

• rtree (⭐990) - Immutable in-memory R-tree and R*-tree implementations in Java with reactive api.

• DataSketches - A Java software library of stochastic streaming algorithms.

Jan 15, 2017

Memory and concurrency

• commons-math - Library of lightweight, self-contained mathematics and statistics components.

Dec 29, 2016

Media

• Give me 15 minutes and I'll change your view of Linux tracing - Brendan Gregg.

Dec 12, 2016

Media

• A Crash Course in Modern Hardware - Cliff Click

Dec 06, 2016

Documentation

• An introduction to distributed systems (⭐8.2k) - Kyle Kingsbury (author of Jepsen).

Nov 25, 2016

Memory and concurrency

• CuckooFilter4J (⭐160) - Bloom filter replacement for approximated set-membership queries.

Nov 24, 2016

Documentation

• The USE method - The Utilization Saturation and Errors (USE) Method is a methodology for analyzing the performance of any system. Brendan Gregg.

People

• Brendan Gregg - Cloud performance, kernel engineer, speaker, author.

Oct 05, 2016

Languages

• Rembulan (⭐157) - Rembulan is an implementation of Lua 5.3 for the JVM, written in pure Java with minimal dependencies.

Aug 18, 2016

Native

• NuProcess (⭐588) - A low-overhead, non-blocking I/O, external Process execution implementation for Java.

Aug 16, 2016

Nix tools

• sysdig - Capture system state and activity from a running Linux instance, then save, filter and analyze.

Aug 15, 2016

Profilers

• jitwatch-intellij (⭐165) - JITWatch plugin for IntelliJ IDEA.

Aug 12, 2016

Profilers

• Tracer (⭐181) - Manages custom trace identifiers and carries them through distributed systems.

Aug 09, 2016

Communities

• Performance Java User's Group - For expert Java developers who want to push their systems to the next level

Media

• Why JNI is slow? - Cliff Click

• JVM Language Summit 2016 - JVM Language Summit 2016.

Jul 07, 2016

Memory and concurrency

• Chronicle-Map (⭐2.5k) - In-memory key-value store designed for low-latency and/or multi-process applications.

• lwjgl3 (⭐4k) - Java library that enables cross-platform access to popular native APIs useful in the development of graphics (OpenGL), audio (OpenAL) and parallel computing (OpenCL) applications.

Jul 01, 2016

Network

• armeria (⭐4k) - Asynchronous RPC/API client/server library built on top of Java 8, Netty 4.1, HTTP/2, and Thrift.

Jun 23, 2016

Media

• Extreme Profiling: Digging Into Hotspots - Nitsan Wakart.

Jun 14, 2016

Memory and concurrency

• Zero-Allocation-Hashing (⭐691) - Hashing any sequences of bytes in Java, including all kinds of primitive arrays, buffers, CharSequences and more.

Jun 07, 2016

Profilers

• jmh-compare-gui (⭐70) - GUI for comparing JMH results.

May 31, 2016

Memory and concurrency

• Agera (⭐7.3k) - Reactive Programming for Android by Google.

Metaprogramming

• auto (⭐9.9k) - A collection of source code generators for Java.

• immutables - Generate simple, safe and consistent value objects.

Runtimes

• Capsule (⭐1.1k) - Dead-Simple Packaging and Deployment for JVM Apps.

May 25, 2016

Languages

• gojava (⭐184) - Java bindings for Go packages.

Metaprogramming

• TeaVM (⭐2.1k) - Ahead-of-time translating compiler (transpiler) from Java bytecode to JavaScript.

May 18, 2016

Memory and concurrency

• rollinghashjava (⭐72) - Rolling hash functions in Java.

Metaprogramming

• Checker Framework - Compiler plug-ins that find bugs or verify their absence.

May 17, 2016

Garbage collectors

• Balanced GC - GC policy available in the Java Virtual Machine for IBM WebSphere Application Server V8.

Memory and concurrency

• Chronicle-Queue (⭐2.8k) - Micro second messaging that stores everything to disk.

• cyclops (⭐1.2k) - Integration modules for RxJava, Reactor, FunctionalJava, Guava & Javaslang.

• LevelDB (⭐1.4k) - Rewrite (port) of LevelDB in Java.

• MapDB - Collections backed by off-heap or on-disk storage.

Network

• Aeron (⭐6.2k) - Efficient reliable UDP unicast, UDP multicast, and IPC message transport.

• gRPC - A high performance, open source, general RPC framework that puts mobile and HTTP/2 first.

• Netty - Async event-driven network library for high performance protocol servers & clients.

• okhttp (⭐43k) - An HTTP+HTTP/2 client for Android and Java applications.

Media

• With GC Solved, What Else Makes a JVM Pause? - John Cuthbertson.

• JVM Mechanics - Douglas Hawkins.

May 13, 2016

Metaprogramming

• GHCVM (⭐2.5k) - A Haskell to JVM compiler that supports GHC Haskell.

Profilers

• HdrLogProcessing (⭐29) - Utilities for HDR Histogram logs manipulation.

• Java Flight Recorder (JFR) - Tool for collecting diagnostic and profiling data about a running Java application with almost no performance overhead.

May 11, 2016

Profilers

• jfr-flame-graph (⭐244) - Converting JFR Method Profiling Samples to FlameGraph compatible format.

May 04, 2016

Memory and concurrency

• Cap’n Proto - Insanely fast data interchange format and capability-based RPC system.

• protobuf - Google's data interchange format.

Apr 29, 2016

Documentation

• Top 10 Performance Mistakes - Digest of the top 10 performance related mistakes Martin Thompson has seen in production.

Media

• Java vs. C Performance - Cliff Click.

People

• Dávid Karnok - RxJava committer that blogs about advanced RxJava.

• Jonas Bonér - Founder & CTO of Lightbend.

• Peter Lawrey - Innovative developer of high performance Java systems for competitive advantage.

• Richard Warburton - Developer, Speaker, Author.

• Stéphane Maldini - Project Reactor Lead @Pivotal.

• Stuart Marks - Doctor Deprecator. Java/JDK/OpenJDK developer

Apr 28, 2016

Metaprogramming

• JSweet - A transpiler from Java to TypeScript/JavaScript.

Apr 13, 2016

Memory and concurrency

• ohc (⭐776) - Java large off heap cache developed for Apache Cassandra 3.0.

Mar 25, 2016

Memory and concurrency

• bloofi (⭐70) - Java implementation of multidimensional Bloom filters

• FlatBuffers - Efficient cross platform serialization library for C++, C#, Go, Java, JavaScript, PHP, and Python.

• SmoothieMap (⭐277) - java.util.Map impl with worst put latencies more than 100 times smaller than java.util.HashMap.

• Simple Binary Encoding (⭐2.7k) - High Performance Message Codec.

• stream-lib (⭐2.2k) - A Java library for summarizing data in streams for which it is infeasible to store all events.

Mar 16, 2016

Native

• JavaCPP (⭐3.9k) - JavaCPP provides efficient access to native C++ inside Java.

Feb 18, 2016

Memory and concurrency

• Apache Arrow - A high-performance cross-system data layer for columnar in-memory analytics.

Feb 17, 2016

Metaprogramming

• Sulong (⭐627) - LLVM IR interpreter written in Java using Truffle and Graal.

• Truffle (⭐18k) - Framework for implementing languages as simple interpreters.

Feb 16, 2016

Metaprogramming

• derive4j (⭐543) - Algebraic data types constructors, pattern-matching, morphisms, optics and typeclasses.

Feb 09, 2016

Media

• Java Profiling from the Ground Up - Nitsan Wakart.

Jan 21, 2016

Languages

• LuaJ - Java-centric implementation of lua vm built to leverage standard Java features.

Jan 20, 2016

Memory and concurrency

• pcollections (⭐700) - A Persistent Java Collections Library.

• RoaringBitmap (⭐2.8k) - A better compressed bitset in Java.

Dec 27, 2015

Virtual Machines

• Avian (⭐1.2k) - Lightweight highly portable JVM with an option for AOT compilation.

• J2ObjC (⭐5.9k) - Translator from Java source to Objective-C code. Keeps shared code between iOS native apps and Android native apps.

• ParparVM (⭐1.3k) - An Open Source Java bytecode to C translator for iOS native development. Designed as a part of the Codename One WORA for mobile project.

Dec 18, 2015

Memory and concurrency

• Reactor - Reactive data applications on the JVM for Java, Groovy, Clojure and other.

Dec 04, 2015

Languages

• Xtend - Flexible and expressive dialect of Java, which compiles into Java 5 source code.

Memory and concurrency

• Reactive Streams - Standard for asynchronous stream processing with non-blocking back pressure.

Native

• hawtjni (⭐151) - A JNI code generator based on the JNI generator used in Eclipse SWT.

Dec 03, 2015

Documentation

• Topics in High-Performance Messaging - Design decisions, experience and constraints explained in high performance messaging systems.

People

• Ben Christensen - Facebook, Netflix, Apple engineering.

• Charles Nutter - JRuby guy.

• Marcus Lagergren - Java language team alumnus.

• Mark Reinhold - Chief Architect, Java Platform Group, Oracle.

• Martijn Verburg - Java Champion.

• Norman Maurer - Netty developer.

• Todd L. Montgomery - Ex-CTO, Ex-NASA researcher, network geek, messaging middleware designer.

• Viktor Klang - Deputy CTO at Typesafe Inc.

Nov 26, 2015

Languages

• Golo - A simple dynamic language that makes extensive usage of invokedynamic.

• OCaml-Java - Supports OCaml language v4. Generates plain Java bytecode and have seamless integration with Java.

Nov 24, 2015

Memory and concurrency

• clj-ds (⭐221) - Clojure's data structures modified for use outside of Clojure.

• gs-collections (⭐1.8k) - Goldman Sachs collections framework.

• transducers-java (⭐117) - Composable algorithmic transformations independent from the context of their input and output sources.

Nov 13, 2015

Memory and concurrency

• JCTools - Concurrent data structures currently missing from the JDK.

Metaprogramming

• Apache Calcite - Dynamic data management framework and SQL parser plugin.

• Graal - New experimental just-in-time compiler for Java that is integrated with the HotSpot virtual machine.

Nix tools

• likwid (⭐1.3k) - Read hardware performance counters on Intel and AMD processors.

Profilers

• jHiccup - jHiccup is an open source tool designed to measure the pauses and stalls associated with an application’s underlying Java runtime platform.

Virtual Machines

• Zing - The only JVM that eliminates Java garbage collection pauses for large heap sizes.

• Zulu - The only certified multi-platform build of OpenJDK: Free, 100% open source Java.

Documentation

• Coordinated Omission problem - Discussion on Mechanical Sympathy.

Media

• The Illusion of Execution - Nitsan Wakart.

• Mythbusting Modern Hardware to Gain 'Mechanical Sympathy' - Martin Thompson.

• Designing for Performance - Martin Thompson.

Nov 04, 2015

Load tools

• Gatling - Asynchronous non-blocking scenario driven load testing tool for testing HTTP servers.

• wrk2 (⭐3.6k) - A constant throughput, correct latency recording variant of wrk.

Memory and concurrency

• RxJava (⭐47k) - Library for composing asynchronous and event-based programs using observable sequences.

Profilers

• hdrhistogram-metrics-reservoir - A Metrics Reservoir implementation backed by HdrHistogram.

• metrics - Measure the behavior of critical components in production environment.

Media

• How NOT to Measure Latency - Gil Tene.

Sep 23, 2015

Garbage collectors

• Shenandoah - Ultra-Low-Pause-Time Garbage Collector.

Sep 21, 2015

Memory and concurrency

• lightweight_trie (⭐47) - A very memory-efficient trie (radix tree) implementation.

Metaprogramming

• Antlr - Parser generator for reading, processing, executing, or translating structured text or binary files.

• compile-testing (⭐630) - Testing tools for javac and annotation processors.

• error-prone (⭐6.2k) - Catch common Java mistakes as compile-time errors.

• javacc - Parser generator for use with Java.

• javaparser (⭐4.4k) - Java 1.8 Parser and Abstract Syntax Tree for Java.

• JavaPoet (⭐9.9k) - A Java API for generating .java source files.

• jparsec (⭐321) - Builds mini parsers in pure Java a la Haskell Parsec.

• MPS - Design and build extensible DSLs and editors.

• parboiled (⭐1.2k) - Parsing of arbitrary input text based on parsing expression grammars.

• Xtext - Framework for development of programming languages and DSLs.

Native

• jnr-ffi (⭐1k) - Load native libraries without writing JNI code by hand.

• jssembly (⭐121) - Execution of native assembly from Java.

Profilers

• HdrHistogram - A Histogram that supports recording and analyzing sampled data value counts.

• jmh - Micro benchmarks written in Java and other languages targetting the JVM.

Sep 20, 2015

Bytecode

• Jitescript (⭐182) - Bytecode generation library similar to BiteScript.

Memory and concurrency

• hppc (⭐875) - High Performance Primitive Collections.

• low-gc-membuffers (⭐132) - In-memory circular buffers that use direct ByteBuffers to minimize GC overhead.

Network

• comcast (⭐9.7k) - Simulating shitty network connections.

• gor (⭐16k) - HTTP traffic replay in real-time.

• jRT (⭐45) - Measures response time of a java application to socket-based requests.

• K3PO (⭐44) - Create arbitrary network traffic and behavior to certify whether a network endpoint behaves correctly.

• muxy (⭐810) - Simulating real-world distributed system failures.

• pig (⭐426) - A Linux packet crafting tool.

• tcpdump - Packet analyzer for network traffic capture.

• tcpflow (⭐1.4k) - Captures TCP connections flows in a way that is convenient for protocol analysis and debugging.

• tcpreplay (⭐928) - Pcap editing and replay tools.

Profilers

• allocation-instrumenter (⭐433) - Java agent that rewrites bytecode to instrument allocation sites.

• aprof (⭐210) - Java memory allocation profiler.

• hawkshaw - Tools for tracking down memory / JVM problems & generating predictable-as-possible VM behaviour.

• heapster (⭐387) - Production heap profiling for the JVM.

• jamm (⭐617) - Measure actual object memory use including JVM overhead.

• java-sizeof (⭐123) - Memory consumption estimator for Java.

• MAT - Java heap analyzer that help find memory leaks and reduce memory consumption.

• leakcanary (⭐28k) - A memory leak detection library for Android and Java.

• perf-map-agent (⭐1.5k) - Generate method mappings to use with the linux perf tool.

• perfj (⭐356) - Linux perf for java programs.

• polarbear (⭐20) - A tool to help diagnose OutOfMemoryError conditions.

• statsd-jvm-profiler (⭐329) - JVM agent profiler that sends profiling data to StatsD.

Sep 19, 2015

Memory and concurrency

• Agrona (⭐2.4k) - Library of data structures and utility methods that are a common need when building high-performance applications.

• caffeine (⭐13k) - A high performance caching library for Java 8.

• high-scale-lib (⭐399) - Cliff Click's High Scale Library.

• Koloboke (⭐965) - Java Collections til the last breadcrumb of memory and performance.

• PauselessHashMap (⭐145) - A java.util.HashMap compatible map that won't stall puts or gets when resizing.

• Quasar - Lightweight threads and actors for the JVM.

Native

• j2v8 (⭐2.3k) - Java API for Google's V8 JavaScript engine.

• Project Panama - Enriching the connections between the JVM and APIs used by C programmers.

Nix tools

• Flame Graphs - Visualization of profiled software, allowing the most frequent code-paths to be identified quickly and accurately.

Sep 18, 2015

Memory and concurrency

• okio (⭐8.1k) - Modern Java IO library that do clever things to save CPU and memory.

• stormpot (⭐303) - A fast object pool for the JVM.

Profilers

• jitwatch (⭐2.8k) - Log analyser / visualiser for Java HotSpot JIT compiler.

Documentation

• False sharing - Threads impact the performance of each other while modifying independent variables sharing the same cache line. Martin Thompson.

Sep 04, 2015

Bytecode

• Byte Buddy - Code generation library creating Java classes at runtime without the help of a compiler.

Network

• SimianArmy (⭐7.9k) - Resiliency tool that helps ensure that your applications can tolerate random instance failures.

Profilers

• honest-profiler (⭐1.2k) - Sampling JVM profiler without the safepoint sample bias.

Virtual Machines

• jvm.go (⭐3.4k) - A JVM written in Go.

Sep 02, 2015

Runtimes

• jvmkill (⭐160) - Agent that forcibly terminates the JVM when it is unable to allocate memory or create a thread.

Aug 27, 2015

Memory and concurrency

• Chronicle-Bytes (⭐325) - Low level memory access wrappers.

Nix tools

• hwloc - Reports the structure of the processor, number of cores, hyperthreads and cache size.

• numactl - Control NUMA policy for processes or shared memory.

• oprofile - System-wide hardware performance monitoring with easy-to-use interface at low overhead.

Aug 26, 2015

Bytecode

• asmtools - Used to develop tools for the production of Java .class files.

Memory and concurrency

• fasttuple (⭐137) - Collections that are laid out adjacently in both on- and off-heap memory.

• netty-buffers - Memory buffer pool implementation similar to jemalloc.

• ObjectLayout - A layout-optimized Java data structure package.

Network

• pcap4j (⭐1k) - Java library for capturing, crafting, and sending packets using libpcap.

Nix tools

• jstat - Monitors GC and compiler statistics in the JVM.

Profilers

• JOL - Analyze actual object layout schemes, footprint, and references in JVMs.

Aug 25, 2015

Nix tools

• perf-tools (⭐8.7k) - Performance analysis tools based on Linux perf_events (aka perf) and ftrace.

Aug 21, 2015

Profilers

• jvmtop (⭐1.1k) - Lightweight console application to monitor running jvms on a machine in top-like manner.

Aug 20, 2015

Profilers

• YourKit - Fully featured, easy to use, low overhead profiler.

Runtimes

• HotswapAgent (⭐1.9k) - Redefine classes at runtime and skip the redeploy process.

• Nailgun - Nailgun is a client, protocol, and server for running Java programs from the command line without incurring the JVM startup overhead.

Virtual Machines

• DCEVM - Modification of Java HotSwap VM with unlimited support for reloading classes at runtime.

Aug 17, 2015

Profilers

• Overseer - Low-Level Hardware Monitoring and Management for Java.

Aug 15, 2015

Nix tools

• javap - Disassembles class files into code that reflects the java bytecode.

• jhat - Java Heap Analysis Tool

• jinfo - Prints configuration information for a given process.

• jstack - Prints stack traces of threads for a given Java process.

Profilers

• JVMTI - Provide a native API to inspect the state and to control the execution of applications running in the JVM.

Documentation

• Garbage Collection Tuning Guide - HotSpot Virtual Machine Garbage Collection Tuning Guide.

Aug 14, 2015

Garbage collectors

• G1 - The Garbage-First Garbage Collector.

Languages

• Renjin - JVM-based interpreter for the R language for the statistical analysis

Nix tools

• atoptool - Logging of system and process activity for long-term analysis, highlighting overloaded system.

• perf - Linux profiling with performance counters.

• sysstat - Performance monitoring tools for Linux.

Profilers

• BTrace (⭐5.2k) - a safe, dynamic tracing tool for the Java platform.

• Chronon - Record your entire java program. Replay on any machine.

• GCViewer (⭐4.1k) - GCViewer is a tool that visualizes verbose GC output.

• Riemann JVM Profiler (⭐288) - JVM agent which sends function-level profiler telemetry to a Riemann server for analysis, visualization, and storage.

• Swiss Java Knife (⭐3.1k) - Small set of tools for JVM troublshooting, monitoring and profiling.

• Takipi - Tells you when and why code breaks in production.

• Zipkin (⭐16k) - A distributed tracing system gather timing data for disparate services developed by Twitter.

Runtimes

• CRaSH - The shell for the Java Platform.

• Drip (⭐1.5k) - Fast JVM launching without the hassle of persistent JVMs.

Virtual Machines

• Dalvik - Android runtime (ART) is the managed runtime used by applications and some system services on Android.

Documentation

• The JVM specification - The Java Virtual Machine Specification Java SE 8 Edition.

• The Java Memory Model - Starting point for discussions of and information concerning the Java Memory Model.

• The JSR-133 Cookbook for Compiler Writers - Unofficial guide to implementing the new Java Memory Model (JMM) specified by JSR-133.

Communities

• concurrency-interest - Discussion list for JSR-166.

• hotspot-compiler-dev - Technical discussion about the development of the HotSpot bytecode compilers.

• hotspot-dev - HotSpot development mailing list.

• hotspot-gc-dev - Technical discussion about the development of the HotSpot garbage collectors.

• mechanical-sympathy - Discussing how to code sympathetically to and measure the underlying stack/platform so good performance can be extracted.

Media

• JVM Language Summit 2015 - JVM Language Summit 2015.

• Bits of advice for VM writers - Cliff Click.

• Understanding Java garbage collection ... - Gil Tene.

• Faster Object Arrays - Gil Tene at GOTO Conferences.

• Java Memory Model Pragmatics - Aleksey Shipilev.

People

• Aleksey Shipilëv - Developing Oracle/Open JDK/Hotspot and other Java-related technologies.

• Brian Goetz - Java Language Architect at Oracle.

• Cliff Click - Creator of the HotSpot Server Compiler.

• Dave Dice - Senior research scientist in the Scalable Synchronization Research Group within Oracle.

• Doug Lea - Author of the Java memory model.

• Gil Tene - Azul Systems.

• John Rose - HotSpot developer.

• Martin Thompson - Pasty faced performance gangster.

• Nitsan Wakart - Azul Systems.

Aug 13, 2015

Languages

• Ceylon - Object-oriented, strong and static programming language with an emphasis on immutability, created by Red Hat.

• Clojure - Dialect of Lisp created by Rich Hickey. Dynamically typed with emphasis on functional programming.

• Erjang - A JVM-based Erlang VM.

• Frege (⭐3.6k) - Pure functional programming language in the spirit of Haskell.

• Groovy - Optionally typed and dynamic language, with static-typing and static compilation capabilities.

• Java - General-purpose, concurrent, strongly typed, class-based object-oriented language.

• JRuby - Implementation of the Ruby language on the JVM.

• Jython - Python for the Java Platform.

• Kawa - Extension of the Scheme language, which is in the Lisp family of programming languages.

• Kotlin - Statically typed programming language for the JVM, Android and the browser.

• Nashorn - Lightweight high-performance JavaScript runtime in Java with a native JVM.

• Scala - Strong and static programming language that combine object-oriented and functional programming ideas.

Profilers

• JProfiler - Helps resolve performance bottlenecks, pin down memory leaks and understand threading issues.

Virtual Machines

• HotSpot - HotSpot virtual machine maintained and distributed by Oracle Corporation.

• IBM J9 - JVM developed by IBM.