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  2. Java memory model - Wikipedia

    en.wikipedia.org/wiki/Java_memory_model

    For the execution of a single thread, the rules are simple. The Java Language Specification requires a Java virtual machine to observe within-thread as-if-serial semantics. The runtime (which, in this case, usually refers to the dynamic compiler, the processor and the memory subsystem) is free to introduce any useful execution optimizations as ...

  3. Java concurrency - Wikipedia

    en.wikipedia.org/wiki/Java_concurrency

    Each thread can be scheduled [5] on a different CPU core [6] or use time-slicing on a single hardware processor, or time-slicing on many hardware processors. There is no general solution to how Java threads are mapped to native OS threads. Every JVM implementation can do this differently. Each thread is associated with an instance of the class ...

  4. List of Java bytecode instructions - Wikipedia

    en.wikipedia.org/wiki/List_of_Java_bytecode...

    This is a list of the instructions that make up the Java bytecode, an abstract machine language that is ultimately executed by the Java virtual machine. [1] The Java bytecode is generated from languages running on the Java Platform, most notably the Java programming language.

  5. Java performance - Wikipedia

    en.wikipedia.org/wiki/Java_performance

    The performance of a Java bytecode compiled Java program depends on how optimally its given tasks are managed by the host Java virtual machine (JVM), and how well the JVM exploits the features of the computer hardware and operating system (OS) in doing so.

  6. GraalVM - Wikipedia

    en.wikipedia.org/wiki/GraalVM

    An experimental "sandbox resource limits" feature was added to Oracle GraalVM Enterprise Edition. GraalVM 21.0.0 2021-01-19 Oracle JDK 1.8.0_281,11.0.10 OpenJDK 1.8.0_282,11.0.10 This release introduced Java on Truffle — a Java virtual machine implementation based on a Truffle interpreter.

  7. Comparison of Java virtual machines - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_Java_virtual...

    JVM Status Latest supported Java version Supported class libraries Performance GNU Classpath OpenJDK Other Interpretation AOT JIT; GCJ: No longer maintained or distributed by GNU as of GCC 7 [16]? Yes No Yes Yes No HotSpot, OpenJDK edition Reference implementation. 1.8 No Yes Yes No Yes HotSpot, Oracle JDK edition Reference implementation. 1.8 ...

  8. Profiling (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Profiling_(computer...

    Profiling results can be used to guide the design and optimization of an individual algorithm; the Krauss matching wildcards algorithm is an example. [5] Profilers are built into some application performance management systems that aggregate profiling data to provide insight into transaction workloads in distributed applications.

  9. Green thread - Wikipedia

    en.wikipedia.org/wiki/Green_thread

    In Java 1.1, green threads were the only threading model used by the Java virtual machine (JVM), [8] at least on Solaris. As green threads have some limitations compared to native threads, subsequent Java versions dropped them in favor of native threads. [9] [10]