Compile-time Options

There are some compile-time options (C/C++ macro) as follows to configure the behavior of Metall:

• METALL_DISABLE_FREE_FILE_SPACE

  • If defined, Metall does not free file space

• METALL_DEFAULT_VM_RESERVE_SIZE=bytes

  • The default virtual memory reserve size
  • An internally defined value is used if 0 is specified
  • Wll be rounded up to a multiple of the system page size (e.g., 4 KB) internally

• METALL_INITIAL_SEGMENT_SIZE=bytes

  • The initial segment size
  • Use the internally defined value if 0 is specified
  • Wll be rounded up to a multiple of the system page size internally

• METALL_FREE_SMALL_OBJECT_SIZE_HINT=bytes

  • Experimental option
  • If defined, Metall tries to free space when an object equal or larger than specified bytes is deallocated
  • Wll be rounded up to a multiple of the page size internally