Monitor How Much Memory You Are Using
The function gc
serves two
purposes. First, it causes garbage collection to occur immediately,
potentially freeing up storage space. Second, it displays statistics
on free memory:
> gc() used (Mb) gc trigger (Mb) max used (Mb) Ncells 774900 20.7 919870 24.6 3032449 81.0 Vcells 53549840 408.6 176511395 1346.7 380946917 2906.4 > # remove a big object > rm(audioscrobbler) > gc() used (Mb) gc trigger (Mb) max used (Mb) Ncells 328394 8.8 919870 24.6 3032449 81.0 Vcells 50049839 381.9 141209116 1077.4 380946917 2906.4
Monitoring Memory Usage
To check on the (approximate) size of a specific object, use
the function object.size
:
> object.size(1) 32 bytes > object.size("Hello world!") 72 bytes > object.size(audioscrobbler) 39374504 bytes
The function memory.profile
displays information on memory usage by object type:
> memory.profile() NULL symbol pairlist closure environment 1 9479 160358 3360 1342 promise language special builtin char 8162 44776 138 1294 48872 logical integer double complex character 4727 8373 2185 4 29761 ... any list expression bytecode 0 0 3488 2 0 externalptr weakref raw S4 993 272 273 1008
To monitor how much memory R is using on a Microsoft Windows
system, you can use the function memory.size
. (On
other platforms, this function returns the value Inf
with a warning.) On startup, here is
how much memory R used:
> memory.size() [1] 10.58104
This function reports memory usage in MB. You can check the maximum amount of memory used so far through ...
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