error: git-fast-import died of signal 11

Hi,
I'm trying to convert a CVS repository to Git using cvs2git. I was able to
generate the dump file without problem but am unable to get Git to
fast-import it. The dump file is 328GB and I ran git fast-import on a
machine with 512GB of RAM.

fatal: Out of memory? mmap failed: Cannot allocate memory
fast-import: dumping crash report to fast_import_crash_18192
error: git-fast-import died of signal 11

How can I import the repository?

Thanks,
Uri