Question

我很好奇我养的是什么限制？我有下一个代码：

import httplib, resource, socket, traceback

print("NOFILE: %s" % str(resource.getrlimit(resource.RLIMIT_NOFILE)))
socket.setdefaulttimeout(100000)

conns = []
for _ in xrange(10000000):
    con = httplib.HTTPConnection('ya.ru')  # or 93.158.134.3
    try:
        con.connect()
        conns.append(con)
    except:
        print("Total connections: %s\n" % len(conns))
        print(traceback.format_exc())
        break    
input("Press any key to exit...")

当HTTPConnection使用主机名时，我会得到下一个输出：

NOFILE: (2560, 9223372036854775807)
Total connections: 1019

Traceback (most recent call last):
  File "test.py", line 13, in <module>
    con.connect()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 772, in connect
    self.timeout, self.source_address)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 571, in create_connection
    raise err
error: [Errno 65] No route to host

当我使用直接IP地址时：

NOFILE: (2560, 9223372036854775807)
Total connections: 1021

Traceback (most recent call last):
  File "test.py", line 13, in <module>
    con.connect()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 772, in connect
    self.timeout, self.source_address)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 571, in create_connection
    raise err
error: [Errno 36] Operation now in progress

它看起来非常相同，因为1019,1021和1024是非常接近的值。我认为1024在我的操作系统中是一个限制。

uname -a
Darwin hackmachine 13.3.0 Darwin Kernel Version 13.3.0: Tue Jun  3 21:27:35 PDT 2014; root:xnu-2422.110.17~1/RELEASE_X86_64 x86_64

ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
file size               (blocks, -f) unlimited
max locked memory       (kbytes, -l) unlimited
max memory size         (kbytes, -m) unlimited
open files                      (-n) 2560
pipe size            (512 bytes, -p) 1
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 709
virtual memory          (kbytes, -v) unlimited

所以，我的问题是：

我遇到的限制是什么？
错误的解释是什么？消息？他们看起来不太自我解释。

UPD：在Debian 7上尝试了同样的事情。 ulimit -n <limit>按预期工作，我可以建立ulimit设置的连接数。因此，它看起来像OS X特定问题。

无法建立超过1024个HTTP连接

0 个答案: