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Groups > comp.lang.java.programmer > #19744

Re: Java daemon

From "John B. Matthews" <nospam@nospam.invalid>
Newsgroups comp.lang.java.programmer
Subject Re: Java daemon
Date 2012-11-13 21:23 -0500
Organization The Wasteland
Message-ID <nospam-2D1A12.21235813112012@news.aioe.org> (permalink)
References <k7r0dv$l3g$1@news.albasani.net> <k7r0su$s92$1@dont-email.me> <k7sq0e$poi$1@news.albasani.net>

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In article <k7sq0e$poi$1@news.albasani.net>, "SL" <sb5309@hotmail.com> 
wrote:

> I do have a question on GC: how to run the GC continuously ? Create a 
> thread, do some memory juggling to induce the GC to run ?

On my platform, the JVM automatically spawns several threads to 
facilitate garbage collection, including one called "Concurrent 
Mark-Sweep GC Thread," which runs at a moderately lower priority than 
the event queue. The host's scheduler uses multiple cores (when 
available) to balance the load in favor of the user. The overall effect 
is that even "busy" programs remain responsive, and I rarely notice GC 
unless I'm looking for it, say in a profiler.

IIUC, the exact number and names of threads is platform-dependent. You 
can use jvisualvm, included with the JDK, to see a thread timeline; or 
you can take a snapshot of running threads via `kill -SIGQUIT pid`.

-- 
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>

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Thread

Java daemon "sl@exabyte" <sb5309@hotmail.com> - 2012-11-12 22:17 +0800
  Re: Java daemon David Lamb <dalamb@cs.queensu.ca> - 2012-11-12 09:25 -0500
    Re: Java daemon "sl@exabyte" <sb5309@hotmail.com> - 2012-11-12 23:55 +0800
      Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-12 22:07 +0000
        Re: Java daemon "sl@exabyte" <sb5309@hotmail.com> - 2012-11-13 10:56 +0800
          Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-12 22:08 -0500
          Re: Java daemon "SL" <sb5309@hotmail.com> - 2012-11-13 13:59 +0800
          Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-13 21:50 +0000
            Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-18 16:43 -0500
              Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-19 01:05 +0000
                Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-18 20:41 -0500
                Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-20 00:32 +0000
                Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-19 20:07 -0500
                Re: Java daemon Arved Sandstrom <asandstrom2@eastlink.ca> - 2012-11-19 20:38 -0400
                Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-19 20:22 -0500
                Re: Java daemon Arved Sandstrom <asandstrom2@eastlink.ca> - 2012-11-20 17:46 -0400
              Re: Java daemon Lew <lewbloch@gmail.com> - 2012-11-18 20:10 -0800
                Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-19 10:50 -0500
        Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-12 22:06 -0500
          Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-13 21:36 +0000
            Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-13 17:31 -0500
              Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-14 21:33 +0000
                Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-14 16:55 -0500
                Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-15 02:09 +0000
    Re: Java daemon "SL" <sb5309@hotmail.com> - 2012-11-13 14:40 +0800
      Re: Java daemon Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-11-12 23:39 -0800
        Re: Java daemon "SL" <sb5309@hotmail.com> - 2012-11-13 16:16 +0800
      Re: Java daemon Arved Sandstrom <asandstrom2@eastlink.ca> - 2012-11-13 06:37 -0400
      Re: Java daemon David Lamb <dalamb@cs.queensu.ca> - 2012-11-13 08:46 -0500
      Re: Java daemon "John B. Matthews" <nospam@nospam.invalid> - 2012-11-13 21:23 -0500
      Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-18 16:52 -0500
      Re: Java daemon markspace <-@.> - 2012-11-18 14:02 -0800
        Re: Java daemon jlp <jlp@jlp.com> - 2012-11-19 20:39 +0100
          Re: Java daemon "SL@maxis" <ecp_gen@my-rialto.com> - 2012-11-20 15:23 +0800
  Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-12 09:41 -0500
  Re: Java daemon Jim Janney <jjanney@shell.xmission.com> - 2012-11-12 14:24 -0700
    Re: Java daemon Lew <lewbloch@gmail.com> - 2012-11-12 13:35 -0800
      Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-12 22:05 -0500
    Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-18 16:40 -0500

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