public long estimatedTotalMemoryUsedBytes() {
      //Should be +/- good estimation:
      return roundUpTo(
        heapCommitedBytes + threadStacksBytes + directByteBuffersBytes + jvmInternalsMemoryBytes,
        100 * IOUtil.MiB //to show too many digits could be confusing for a 'rough estimation'
      );
    }
public long estimatedTotalMemoryUsedBytes()