svnadmin load Memory usage

Hi

I'm trying to load from a dump file into a new repository.
And have a trouble.
A svnadmin process uses a lot of memory, about 6.7GB.

I firstly tried it on 32bit Linux with 4GB physical memory,
then it failed "Out of memory".
I tried it on 64bit Linux with 4GB physical memory and 4GB swap,
then it succeeded, but svnadmin uses 6.7GB virtual memory.

I have two questions:
Why does svnadmin use such memory?
Is this a bug or an expected behavior?

svnadmin load on 32bit Linux outputs:
<<< Started new transaction, based on original revision 118720
* adding path : AB/ABCDE/GHIJKL ... done.
* adding path : AB/ABCDE/GHIJKL/GHIJKL ...Out of memory - terminating
application.

ps outputs:
nriuser 21495 76.0 73.8 3078452 3062428 pts/1 R+ 11:07 24:22 svnadmin
load /home/nriuser/svn/foo

I attached the whole ps output text with the command:
while true; do date; ps ux | grep -v grep | grep svnadmin;
echo; sleep 10; done

Dumps are created separated with --incremental.
1,158,283,603 bytes 1-40000.dump
2,539,323,286 bytes 40001-80000.dump
10,287,123,925 bytes 80001-120000.dump
2,616,197,892 bytes 120001-167711.dump

Exported files of HEAD
counts: about 113600
whole size: about 4.4GB

Repository
revision: 167711
size: about 11GB

32bit Linux
OS: CentOS 5.3 i386
Memory: 4GB
Swap File: 5GB
Subversion: 1.6.3 (from tarball)
APR: 1.3.5 (from subverion-deps)
APR-Util: 1.3.7 (from subverion-deps)

64bit Linux
OS: CentOS 5.3 x86_64
Memory: 4GB
Swap File: 4GB
Subversion: 1.6.2 (from tarball)
APR: 1.3.3 (from Apache 2.2.11)
APR-Util: 1.3.4 (from Apache 2.2.11)

Thanks in advance

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