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Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow)

References <b9f77b6f-3a65-407a-aff5-5677be2ba228@googlegroups.com>
Date 2013-09-01 21:37 +1000
Subject Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow)
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.446.1378035456.19984.python-list@python.org> (permalink)

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On Sun, Sep 1, 2013 at 10:03 AM,  <anntzer.lee@gmail.com> wrote:
> At startup, IPython (qtconsole) calls "socket.gethostbyname_ex(socket.gethostname())[2]" to find a list of IP addresses that point to the machine. On a Linux server that I manage this call is extremely slow (>20s)... which I have trouble understanding as "ip addr show" seems to give the same information nearly instantaneously. Is there anything I can do to make this faster? Can this be a network configuration issue (I am behind a router)?

Yes, it most definitely CAN be a network config issue. The C function
you want to be calling is getifaddrs(), and I don't think there's a
way to call that from core Python. But a Google search for 'python
getifaddrs' shows up a few third-party modules that might be of use to
you; that'd be a lot quicker and more reliable than trying to look up
your own hostname and depending on the results.

ChrisA

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Thread

gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) anntzer.lee@gmail.com - 2013-08-31 17:03 -0700
  Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) Roy Smith <roy@panix.com> - 2013-08-31 21:01 -0400
    Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) anntzer.lee@gmail.com - 2013-08-31 21:51 -0700
      Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) Michael Torrie <torriem@gmail.com> - 2013-08-31 23:06 -0600
        Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) anntzer.lee@gmail.com - 2013-09-01 10:13 -0700
      Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) Roy Smith <roy@panix.com> - 2013-09-01 06:57 -0400
  Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) Chris Angelico <rosuav@gmail.com> - 2013-09-01 21:37 +1000
    Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) anntzer.lee@gmail.com - 2013-09-01 13:37 -0700
      Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) Chris Angelico <rosuav@gmail.com> - 2013-09-02 07:03 +1000
        Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) anntzer.lee@gmail.com - 2013-09-01 22:28 -0700
          Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) Chris Angelico <rosuav@gmail.com> - 2013-09-02 20:42 +1000
          Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) Roy Smith <roy@panix.com> - 2013-09-02 08:45 -0400
            Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) anntzer.lee@gmail.com - 2013-09-02 10:52 -0700
              Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) Chris Angelico <rosuav@gmail.com> - 2013-09-03 07:12 +1000

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