gc {base} | R Documentation |
A call of gc
causes a garbage collection to take place.
gcinfo
sets a flag so that
automatic collection is either silent (verbose=FALSE
) or
prints memory use statistics (verbose=TRUE
).
gc(verbose = getOption("verbose")) gcinfo(verbose)
verbose |
logical; if TRUE , the garbage collection prints
statistics about cons cells [in Bytes] and the vector heap [in KBytes]. |
A call of gc
causes a garbage collection to take place.
This takes place automagically without user intervention, and the
primary purpose of calling gc
is for the report on memory usage.
gc
returns a 2*3 matrix with rows "Ncells"
(cons
cells, usually 20 bytes each on 32-bit systems, 36 bytes each on
64-bit systems) and "Vcells"
(vector cells, 8 bytes each),
and columns "free"
, "total"
and "(Mb)"
(rounded up
to the next 0.1Mb).
gcinfo
returns the previous value of the flag.
Memory
on R's memory management and
gctorture
if you are an R hacker.
gc() #- do it now gcinfo(TRUE) #-- in the future, show when R does it x <- integer(0); for(i in 1:18) x <- c(x,i,x) gcinfo(verbose = FALSE)#-- don't show it anymore ( rgc <- gc(TRUE) ) (100*rgc[,"free"])%/% rgc[,"total"] # the percentages rgc[2,"free"]/ (1024 / 8) # free vector heap in K bytes