public static long parseOffHeapMemorySize(String value) {
    final long parsed = parseLongWithUnits(value, 0L, 1024 * 1024);
    if (parsed < 0) {
      return 0;
    }
    return parsed;
  }
Enables off-heap storage by creating a MemoryAllocator.

@since Geode 1.0
geode-core/src/main/java/org/apache/geode/internal/offheap/OffHeapStorage.java