allocs.alloc_extent	# of extents allocated
allocs.alloc_block	# of blocks allocated
allocs.free_extent	# of extents freed
allocs.free_block	# of blocks freed
alloc_btree.lookup	# of allocation btree lookups		
alloc_bteee.compare	# of compares in alloc btree lookup
alloc_btree.insrec	# of extent record inserts in btree
alloc_btree.delrec	# of extent record deletes in btree