Maximum amount of memory in Kbyte to use for all buffers together. The maximum usable value is about 2000000 (2 Gbyte). Use this to work without a limit. On 64 bit machines higher values might work. But hey, do you really need more than 2 Gbyte for text editing? Keep in mind that text is stored in the swap file, one can edit files > 2 Gbyte anyway. We do need the memory to store undo info. Buffers with 'swapfile' off still count to the total amount of memory used. Also see 'maxmem'.