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Massive memory use by XmlDocument
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James O (VIP)
I wrote a very simple test program that opens an XML document then releases
the reference to it:

static void Main(string[] args)
{
    XmlDocument doc = null;
    using (Stream s = File.OpenRead(args[0]))
    {
        doc = LoadXmlDocFromStream(s);
    }

    doc = null;
    
Console.ReadLine();
}

protected static XmlDocument LoadXmlDocFromStream(Stream s)
{
    XmlDocument d = new XmlDocument();
    d.PreserveWhitespace = false;
    XmlTextReader reader = new XmlTextReader(s);
    d.Load(reader);
    reader.Close();

    return d;
}

When I open a 20MB XML doc, I see through the CLR profiler that my CLR
memory usage jumps from 6K to a whopping 90MB. My working set size as shown
by the Task Manager jumps from 8MB to 210MB!

What's even more disturbing than these numbers is that when I release the
reference to the object, the CLR memory goes back down to 6K, but my working
set size remains at about 200MB! That just seems wrong.
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Andy Becker
"James O" <James Click here to reveal e-mail address> wrote in message
news:Click here to reveal e-mail address...
[Original message clipped]

Given that XML is about 90% redundant data, I'm not too surprised at the
bloat.

Don't worry too much about what shows up in task manager, that memory gets
returned to the OS when other applications request it.

Best Regards,

Andy
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David Browne
"James O" <James Click here to reveal e-mail address> wrote in message
news:Click here to reveal e-mail address...
> I wrote a very simple test program that opens an XML document then
releases
[Original message clipped]

.. . .

[Original message clipped]

You have discovered that XMLDocument is not an appropriate type for
manipulating very large XML documents. Try the streaming XMLReader instead.

David
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Dathon
Yeah, but there's bad and there's just plain broken. The huge memory
consumption is coming from somewhere other than the CLR heap, which is very
suspicious, IMO.

Any 'softies out there who know the inside scoop on this one?

Thx,
James

"David Browne" wrote:

[Original message clipped]
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System.Console
System.IO.File
System.Xml.XmlDocument
System.Xml.XmlTextReader




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