[Pythonmac-SIG] socket.getaddrinfo problems

[Dudley Carr]

Chris Ryland wrote:

> This came up on Python-Dev a while back--you could google for it.
> 
> A big discussion ensued, but it fizzled out in the end, IIRC.
> 
> The bottom line is that you'd really have to do your own DNS caching. I 
> guess some other Unix-like systems do that at the library level.
> 

There's this SourceForge bug report that looks to be still open that explains 
some of the getaddrinfo slowness:

http://sourceforge.net/tracker/index.php?func=detail&aid=774751&group_id=5470&atid=105470

DNS caching would certainly improve subsequent queries for the same domain. 
However, what I tried to point out with the timings is that I get these rather 
large spikes (17 seconds) which I don't attribute to general slowness of 
getaddrinfo on OS X. The example only used yahoo.com. However, when I did twenty 
different getaddrinfo queries for different domains, I still saw those spikes 
consistently happening after 10 or so queries. I have to attribute it to my 
network setup because the two other timings by other people didn't show the 
large spikes that I am seeing.

Regards,
Dudley