Determining memory usage?

Question

I'd like to work out how much RAM is being used by each of my objects inside my current workspace. Is there an easy way to do this?

Answer 1

some time ago I stole this little nugget from here:

sort( sapply(ls(),function(x){object.size(get(x))}))

it has served me well

Answer 2

You could try the lsos() function from this question:

R> a <- rnorm(100)
R> b <- LETTERS
R> lsos()
       Type Size Rows Columns
b character 1496   26      NA
a   numeric  840  100      NA
R>

Answer 3

1. By Object

To get memory allocation on an object-by-object basis, use 'object.size'

object.size("how_much_RAM_am_i_using")

if 'how_much_RAM_am_i_using' is a variable name, then omit the quotes, or enclose the variable quoted variable name in a 'get' call

You can loop through your namespace:

for (itm in ls()){print(formatC(c(itm, object.size(get(itm))), format="d", 
                  big.mark=",", width=30), quote=F)}

2. By Object Type

To get memory usage for your namespace by object type, use 'memory.profile'

memory.profile()

   NULL      symbol    pairlist     closure environment     promise    language 
      1        9434      183964        4125        1359        6963       49425 
special     builtin        char     logical     integer      double     complex 
    173        1562       20652        7383       13212        4137           1 

There's another function, 'memory.size()' but it only seems to work on Windows; it just returns a value in MB. To get the maximum amount of memory used at any time in the session, use memory.size(max=T).