Hello. Branch is ready. Boehm GC is in. 2 major problems: - It's much slower than expected. - It doesn't work with FixedSizeAllocator. For testing/investigations just switch PARROT_GC_DEFAULT_TYPE to BOEHM_GC and PARROT_GC_USE_FIXED_SIZE_ALLOCATOR to 0 in include/parrot/settings.h -- Bacek