This blog is updated daily.
A general description is here.
R on Windows uses again the system memory allocator. Previously, R
shipped with Doug Lea's allocator as a replacement to overcome
performance limitations seen with system allocators on earlier versions
of Windows. Like on Unix-alike, once using the system allocator, R on
Windows no longer provides ‘memory.limit()’, ‘memory.size()’,
command-line option ‘--max-mem-size’ and environment variable
‘R_MAX_MEM_SIZE’. The allocation limit was important on 32-bit
Windows, but R no longer supports 32-bit builds.
R on Windows now uses the system memory allocator. Doug Lea's allocator was used since R 1.2.0 to mitigate performance limitations seen with system allocators on earlier versions of Windows.
‘memory.limit()’ and ‘memory.size()’ are now stubs on Windows (as on Unix-alikes).
On Windows, the command-line option ‘--max-mem-size’ and environment variable ‘R_MAX_MEM_SIZE’ are defunct. The memory allocation limit was important for 32-bit Windows builds, but these are no longer supported.