Re: Is gethostbyaddr() slow?

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i missed another keypoint..

if you are running unix/linux server, you need to have a properly
setup resolv.conf

or if you experience a slowness while you quering your own domains,
check whether you DNS servers are providing "authoritative" answers to
your domains.


~viraj.

On 8/4/05, kalinga <kalinga@xxxxxxxxx> wrote:
> On 8/4/05, kalinga <kalinga@xxxxxxxxx> wrote:
> > On 8/4/05, Kristen G. Thorson <kthorson@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> > > I can say from personal experience that gethostbyaddr() and 
> > > gethostbyname() can seem almost randomly slow, depending on machine, OS,
> 
> > > software, who knows.  I'm not smart enough to figure out the reason why
> 
> > > it can vary so much on machines with nearly the same configuration, but
> 
> > > I can tell you that it works perfectly fast most of the time.  Then 
> > > there's that other 5% where something makes it slow as molasses.
> > > 
> > > I have two machines that are so similar it's not funny, but 
> > > gethostbyname() takes 1/10 s on one, and 5 s on the other.  I have yet 
> > > to figure out what's the difference between them that causing this.
> 
> if you are quering a external host, the bad network conditions may
> cause delay in results.
> 
> if your server is connected to a heavily loaded hub/ cheap switch, or
> the target hosts DNS servers are poorly configured/ slow in responce
> it adds further delay to your result.
> 
> try dig/ nslookup on your server for the target hostname/address, you
> may experience the same delay as with the php function.
> 
> 
> ~viraj.
> 
> > > 
> > > 
> > > kgt
> > > 
> > > 
> > > 
> > > Dotan Cohen wrote:
> > > 
> > > >Hi all, I just discovered the gethostbyaddr() function. By reading the
> > > >user contributed notes, I get the impression that either this function
> > > >may cause performance problems, or a user-contributed function based
> > > >upon it may be slow. So, is gethostbyaddr() slow? Is it dangerous?
> > > >Thanks!
> > > >
> > > >Dotan Cohen
> > > >http://lyricslist.com/lyrics/artist_albums/56/bangles.php
> > > >The Bangles Song Lyrics
> > > >
> > > >  
> > > >
> > > 
> > > -- 
> > > PHP General Mailing List (http://www.php.net/)
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> > > 
> > >
> >
>

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