晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/lib64/python2.7/Demo/sockets/throughput.py
#! /usr/bin/python2.7

# Test network throughput.
#
# Usage:
# 1) on host_A: throughput -s [port]                    # start a server
# 2) on host_B: throughput -c  count host_A [port]      # start a client
#
# The server will service multiple clients until it is killed.
#
# The client performs one transfer of count*BUFSIZE bytes and
# measures the time it takes (roundtrip!).


import sys, time
from socket import *

MY_PORT = 50000 + 42

BUFSIZE = 1024


def main():
    if len(sys.argv) < 2:
        usage()
    if sys.argv[1] == '-s':
        server()
    elif sys.argv[1] == '-c':
        client()
    else:
        usage()


def usage():
    sys.stdout = sys.stderr
    print 'Usage:    (on host_A) throughput -s [port]'
    print 'and then: (on host_B) throughput -c count host_A [port]'
    sys.exit(2)


def server():
    if len(sys.argv) > 2:
        port = eval(sys.argv[2])
    else:
        port = MY_PORT
    s = socket(AF_INET, SOCK_STREAM)
    s.bind(('', port))
    s.listen(1)
    print 'Server ready...'
    while 1:
        conn, (host, remoteport) = s.accept()
        while 1:
            data = conn.recv(BUFSIZE)
            if not data:
                break
            del data
        conn.send('OK\n')
        conn.close()
        print 'Done with', host, 'port', remoteport


def client():
    if len(sys.argv) < 4:
        usage()
    count = int(eval(sys.argv[2]))
    host = sys.argv[3]
    if len(sys.argv) > 4:
        port = eval(sys.argv[4])
    else:
        port = MY_PORT
    testdata = 'x' * (BUFSIZE-1) + '\n'
    t1 = time.time()
    s = socket(AF_INET, SOCK_STREAM)
    t2 = time.time()
    s.connect((host, port))
    t3 = time.time()
    i = 0
    while i < count:
        i = i+1
        s.send(testdata)
    s.shutdown(1) # Send EOF
    t4 = time.time()
    data = s.recv(BUFSIZE)
    t5 = time.time()
    print data
    print 'Raw timers:', t1, t2, t3, t4, t5
    print 'Intervals:', t2-t1, t3-t2, t4-t3, t5-t4
    print 'Total:', t5-t1
    print 'Throughput:', round((BUFSIZE*count*0.001) / (t5-t1), 3),
    print 'K/sec.'


main()

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