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Date: Thu, 21 Feb 2008 22:02:09 -0500
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Thread-Topic: Memory leak in 1.5.0 JVM
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References: <200802220207.m1M27I9r080073@camembert.async.caltech.edu>
From: "Samuel R. Baskinger" <sbaskinger@lumeta.com>
To: "Mika Nystrom" <mika@async.caltech.edu>,
	<freebsd-java@freebsd.org>
Cc: mika@camembert.async.caltech.edu
Subject: RE: Memory leak in 1.5.0 JVM
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Do you get the same results if you put a System.gc() after your thread =
spawn? Perhaps you are just out-running the garbage collector. :)

I tried this on the diablog-jdk 1.5 on amd64 bsd and it runs quite =
nicely unmodified.

[sam@bob ~]$ java -version
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build =
diablo-1.5.0-b01)
Java HotSpot(TM) 64-Bit Server VM (build diablo-1.5.0_07-b01, mixed =
mode)
[sam@bob ~]$=20

Sam

-----Original Message-----
From: owner-freebsd-java@freebsd.org on behalf of Mika Nystrom
Sent: Thu 2/21/2008 9:07 PM
To: freebsd-java@freebsd.org
Cc: mika@camembert.async.caltech.edu
Subject: Memory leak in 1.5.0 JVM
=20
Hello there freebsd-java,

I am running a binary downloaded 1.5.0 JVM on a FreeBSD 5.5 system:

(167)rover:~/levinc/memleak>java -version
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build =
diablo-1.5.0-b01)
Java HotSpot(TM) Client VM (build diablo-1.5.0_07-b01, mixed mode)
(168)rover:~/levinc/memleak>uname -a
FreeBSD rover 5.5-RELEASE FreeBSD 5.5-RELEASE #4: Sat Nov 17 12:13:24 =
PST 2007     mika@rover:/usr/src/sys/i386/compile/ROVER  i386

I have found the following program to leak memory on FreeBSD, but not on =
Windows with same Java 1.6.0, nor on Debian with gij 1.4.2:

class Leakq {

  private static class MyThread extends Thread {
    public void run()=20
    {

    }
  }

  public static void main (String[] args)
  {
    for(;;) {
      (new MyThread()).start();
    }
  }
}

    Best regards,
      Mika Nystrom
      mika@alum.mit.edu
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