def main(src, dest, num_processes=2, split=50, force=False, reduced_redundancy=False, verbose=False, quiet=False, secure=True, max_tries=5):
    # Check that dest is a valid S3 url
    split_rs = urlparse.urlsplit(dest)
    if split_rs.scheme != "s3":
        raise ValueError("'%s' is not an S3 url" % dest)

    s3 = boto.connect_s3(calling_format=OrdinaryCallingFormat())
    s3.is_secure = secure
    bucket = s3.lookup(split_rs.netloc)
    if bucket == None:
        raise ValueError("'%s' is not a valid bucket" % split_rs.netloc)
    key = bucket.get_key(split_rs.path)
    # See if we're overwriting an existing key
    if key is not None:
        if not force:
            raise ValueError("'%s' already exists. Specify -f to overwrite it" % dest)

    # Determine the splits
    part_size = max(5*1024*1024, 1024*1024*split)
    src.seek(0,2)
    size = src.tell()
    num_parts = int(ceil(size / part_size))

    # If file is less than 5M, just upload it directly
    if size < 5*1024*1024:
        src.seek(0)
        t1 = time.time()
        k = boto.s3.key.Key(bucket,split_rs.path)
        k.set_contents_from_file(src)
        t2 = time.time() - t1
        s = size/1024./1024.
        logger.info("Finished uploading %0.2fM in %0.2fs (%0.2fMBps)" % (s, t2, s/t2))
        return

    # Create the multi-part upload object
    mpu = bucket.initiate_multipart_upload(split_rs.path, reduced_redundancy=reduced_redundancy)
    logger.info("Initialized upload: %s" % mpu.id)

    # Generate arguments for invocations of do_part_upload
    def gen_args(num_parts, fold_last):
        for i in range(num_parts+1):
            part_start = part_size*i
            if i == (num_parts-1) and fold_last is True:
                yield (bucket.name, mpu.id, src.name, i, part_start, part_size*2, secure, max_tries, 0)
                break
            else:
                yield (bucket.name, mpu.id, src.name, i, part_start, part_size, secure, max_tries, 0)


    # If the last part is less than 5M, just fold it into the previous part
    fold_last = ((size % part_size) < 5*1024*1024)

    # Do the thing
    try:
        # Create a pool of workers
        pool = Pool(processes=num_processes)
        t1 = time.time()
        pool.map_async(do_part_upload, gen_args(num_parts, fold_last)).get(9999999)
        # Print out some timings
        t2 = time.time() - t1
        s = size/1024./1024.
        # Finalize
        src.close()
        mpu.complete_upload()
        logger.info("Finished uploading %0.2fM in %0.2fs (%0.2fMBps)" % (s, t2, s/t2))
    except KeyboardInterrupt:
        logger.warn("Received KeyboardInterrupt, canceling upload")
        pool.terminate()
        mpu.cancel_upload()
    except Exception as err:
        logger.error("Encountered an error, canceling upload")
        logger.error(err)
        mpu.cancel_upload()