It is perfectly OK for fibers to do that sporadically (as the work stealing scheduler will deal with that), but doing so frequently may severely impact system performance (as most of the scheduler’s threads might be tied up by runaway fibers). Runaway FibersĪ fiber that is stuck in a loop without blocking, or is blocking the thread its running on (by directly or indirectly performing a thread-blocking operation) is called a runaway fiber. The MXBean’s name is "co.paralleluniverse:type=Fibers,name=SCHEDULER_NAME", and you can find more details in the Javadoc. See the Javadoc for details.Įvery scheduler creates a MXBean that monitors the fibers scheduled by that scheduler. To that purpose you can use FiberExecutorScheduler. This is a high-quality work-stealing scheduler, but sometimes you might want to schedule fibers in a thread pool of your own design or even on a particular thread (e.g. The default scheduler is an instance of FiberForkJoinScheduler which schedules fibers in a ForkJoinPool. You can set the default scheduler’s properties by setting some system properties. If you don’t a default scheduler is used. When constructing a fiber, you can specify which scheduler should schedule it. JvmArgs "-javaagent:$ The Scheduler and Monitoringįibers are scheduled by a FiberScheduler. To run the Java agent, the following must be added to the java command line (or use your favorite build tool to add this as a JVM argument): Instrumentation can be performed at compilation time (detailed below) or at runtime using a Java agent. Quasar’s lightweight thread implementation relies on bytecode instrumentation. This can be done at classloading time via a Java Agent, or at compilation time with an Ant task. Quasar fibers rely on bytecode instrumentation. Using Maven/GradleĪdd the following Maven/Gradle dependencies: FeatureĬo.paralleluniverse:quasar-reactive-streams:0.8.0 Note: We recommend using recent JDK builds as bugs in older releases can negatively affect your application. Prior versions support JDK 7 and 8 ( JDK 8 with the jdk8 classifier for the quasar-core component). Getting Started System RequirementsĪs of version 0.8.0 Quasar runs on Java 11 and higher. Introductory blog post: Erlang (and Go) in Clojure (and Java), Lightweight Threads, Channels and Actors for the JVM. October 15, 2013Ī new spaceships demo showcases Quasar’s (and SpaceBase’s) abilities. Quasar’s clustering makes use of Galaxy, by Parallel Universe AcknowledgmentsĪ core component of Quasar, bytecode instrumentation, is a fork of the wonderful Continuations Library by Matthias Mann. SLF4J - Simple Logging Facade for Java ( SLF4J).Guava - Java utility classes, by Google.Metrics - A measurement and monitoring library, by Coda Hale.ASM - Java bytecode manipulation and analysis framework, by the ASM team.Quasar is developed by Parallel Universe and released as free software, dual-licensed under the Eclipse Public License and the GNU Lesser General Public License. Quasar is a library that provides high-performance lightweight threads, Go-like channels, Erlang-like actors, and other asynchronous programming tools for Java and Kotlin.Ī good introduction to Quasar can be found in the blog post Erlang (and Go) in Clojure (and Java), Lightweight Threads, Channels and Actors for the JVM.
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