please ask, why ftp is slower than http server , it needs some special options ?

[tick-guo]

my same local network
python3 -m http.server 6789
speed 100M/s

python3 -m pyftpdlib -p 21
speed 25M/s

then i tried some options , it is slow always

# 定义FTP服务器地址和端口号
address = ("192.168.1.100", 21)  # 监听所有接口的21端口
#server = FTPServer(address, handler)
server = ThreadedFTPServer(address, handler)
#server = MultiprocessFTPServer(address, handler)

# 设置被动模式地址和端口范围
server.passive_ports = range(1000, 2000)
server.max_cons = 100
server.max_cons_per_ip = 100
server.ac_in_buffer_size = 1 * 1024 * 1024 * 100
server.ac_out_buffer_size = 1 * 1024 * 1024 * 100

[giampaolo]

Perhaps it's Windows... This are the numbers I get on Linux:

$ python3 ftpclient.py 
  1.0s:   929.67 MB/s
  2.0s:  1273.08 MB/s
  3.0s:  1274.94 MB/s
  4.0s:   941.45 MB/s
  5.0s:   606.11 MB/s
  6.0s:  1062.21 MB/s
  7.0s:  1132.42 MB/s
  8.0s:  1141.80 MB/s
  9.0s:  1123.88 MB/s
 10.0s:  1090.74 MB/s
 11.0s:  1090.90 MB/s
 12.0s:  1246.38 MB/s
 13.0s:  1145.02 MB/s
 14.0s:  1173.32 MB/s
 15.0s:  1119.93 MB/s
 16.0s:  1150.80 MB/s
 17.0s:  1159.88 MB/s
 18.0s:  1172.77 MB/s
 19.0s:  1135.94 MB/s

The script:

import ftplib
import threading
import time


def download_ftp_file(host, user, passwd, remote_path, local_path):
    ftp = ftplib.FTP()
    ftp.connect(host, 2121)
    ftp.login(user=user, passwd=passwd)

    total_bytes = 0
    start_time = time.time()
    stop_flag = threading.Event()

    def report_speed():
        last_bytes = 0
        while not stop_flag.is_set():
            time.sleep(1)
            elapsed = time.time() - start_time
            current = total_bytes
            delta = current - last_bytes
            last_bytes = current
            speed = delta / 1024 / 1024
            print(f"{elapsed:5.1f}s: {speed:8.2f} MB/s")

    def write_chunk(data):
        nonlocal total_bytes
        f.write(data)
        total_bytes += len(data)

    t = threading.Thread(target=report_speed)
    t.start()

    with open(local_path, "wb") as f:
        ftp.retrbinary(f"RETR {remote_path}", write_chunk)

    stop_flag.set()
    t.join()
    ftp.quit()

    elapsed = time.time() - start_time
    print(f"Downloaded {total_bytes} bytes in {elapsed:.2f}s "
          f"({total_bytes / elapsed / 1024:.2f} KB/s avg)")


if __name__ == "__main__":
    # Example usage.
    download_ftp_file(
        host="127.0.0.1",
        user="anonymous",
        passwd="anonymous@",
        remote_path="win-10-2 Clone-disk1.vmdk",
        local_path="example.txt",
    )

[tick-guo]

@giampaolo thanks to reply.

I use you client script to test.
It is also not well~

..

..
I test filezilla server 1.10.2 same on win10 to win10 , it is faster,
I think the lib has some points to be good.

..