[GRASS-user] r.cost: exact meaning of percent_memory ?

[Moritz Lennert]

I am trying to understand the 'percent_memory' option in r.cost. In the 
man page it says: "The amount of map to hold in memory at one time can 
be controlled with the percent_memory option. For large maps this value 
will have to be set to a lower value.".

IIUC, this would mean that if I have a region of X DCELL cells, I would 
need: X*8 bytes of memory, or ?

So if memory available is > X*8 I should be able to use 
percent_memory=100 (or at least 75). Is that correct ?

Is there a special reason why r.cost doesn't use a "memory" parameter 
instead of percent_memory ? IMHO, the former is a bit easier to handle 
for the average user.

Moritz