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Asked: 2026-06-10T14:31:03+00:00

I’m using this Java version: java version 1.6.0_24 OpenJDK Runtime Environment (IcedTea6 1.11.3) (suse-9.1-x86_64)

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I’m using this Java version:

java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.3) (suse-9.1-x86_64)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

When I start a java program, e.g. 

java TestApp

by default, will the JVM run in parallel ?

If so, which parts run in parallel ?

I am interested in this, because I found if I use taskset -c 0 java TestApp to bind TestApp running on processor 0, the first running time is much slower than java TestApp. Does this imply something?

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1 Answer

  1. Editorial Team

    There are a number of single threaded tasks which have a thread of their own.

    • the main thread which runs you program
    • the background byte code to native compiler
    • the finalizer thread (to call finalize() on objects)
    • the GC thread pool

    Your code will only use as many threads as you create (plus “main” which created for you)

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