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Groups > comp.lang.python > #53392
| From | Roy Smith <roy@panix.com> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: gethostbyname_ex(hostname) extremely slow (crossposted from stackoverflow) |
| Date | 2013-08-31 21:01 -0400 |
| Organization | PANIX Public Access Internet and UNIX, NYC |
| Message-ID | <roy-F5C43B.21010031082013@news.panix.com> (permalink) |
| References | <b9f77b6f-3a65-407a-aff5-5677be2ba228@googlegroups.com> |
In article <b9f77b6f-3a65-407a-aff5-5677be2ba228@googlegroups.com>, anntzer.lee@gmail.com wrote: > Hi, > > 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)? It's almost certainly some sort of configuration issue which is causing some DNS query to timeout. The first step, is to figure out which part is taking so long. Open up a python shell and run: >>> name = socket.gethostname() see how long that takes and what it returns. Then, assuming it returns a string containing your hostname (massive handwave about what that actually means), try >>> socket.gethostbyname_ex(name) and see how long that takes and what it returns. At least at that point you'll have cut the problem in half. If I had to guess, you've got a missing PTR record, because that's what most people screw up.
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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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