The file to be used for recording the memory
allocations. Set to NULL or "" to disable reporting.
logical: should the file be over-written or appended to?
numeric: allocations on R's "large vector" heap
larger than this number of bytes will be reported.
Enabling profiling automatically disables any existing profiling to
another or the same file.
Profiling writes the call stack to the specified file every time
malloc is called to allocate a large vector object or to
allocate a page of memory for small objects. The size of a page of
memory and the size above which malloc is used for vectors are
compile-time constants, by default 2000 and 128 bytes respectively.
The profiler tracks allocations, some of which will be to previously
used memory and will not increase the total memory use of R.
The R sampling profiler, Rprof also collects