In [this PR](https://github.com/localstack/localstack/pull/1200/files) we introduced a new way of starting S3 in a separate process.

In the meantime, the service startup has been significantly reworked, and it seems that we can integrate the S3 starter into the [`multiserver.py`](https://github.com/localstack/localstack/blob/master/localstack/utils/server/multiserver.py) based loading approach that loads multiple APIs in a single process, for performance reasons. We should look into that.
filename = 'large_file_%s' % uuid.uuid4()
        f = open(filename, 'wb')
        f.seek(size - 1)
        f.write(b'\0')
        f.close()
        return open(filename, 'r')
    def test_s3_upload_fileobj_with_large_file_notification(self):