Out of memory issue with svn merging

Hi,
 
We are seeing the following error when trying to perform a command-line
svn merge with Subversion 1.6.9 under 32 bit Windows XP.

        Out of memory - terminating application.

        This application has requested the Runtime to terminate it in an
unusual way. Please contact the application's support team for more
information.

Inspecting Windows task manager around this time reveals the following
memory usage

The peak memory usage of the svn.exe process is in excess of 1.8GB.

As an aside, we get the same result when trying to perform the merge
using TortoiseSVN.

We are trying to perform the merge from the root level of our
repository. The total file size (on a developer machine) of the
repository is around 3GB.

This is the first time that we are attempting a root-level merge. Are we
hitting an internal svn limit?

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