[Xapian-discuss] Problems with file descriptors

Gavin Ellis Mendel-Gleason gavin at houseofireland.com
Mon Mar 13 17:36:41 GMT 2006

I had already checked fuser -v position.DB in the database directory and
this is what it reports:
position.DB          root      25476 f....  apache2
                     root      25477 f....  apache2
                     root      25500 f....  apache2
                     root      25502 f....  apache2
                     root      25506 f....  apache2
                     root      25511 f....  apache2

lsof -p <Apache PID> reports the database files a large number of times
(several pages worth). 

I've also run a couple of tests where I do the searches in a seperate
php process via exec() and return the results to my php scripts on
stdout.  This doesn't exhibit the problem, further strengthening my
belief that it is in fact never reclaiming the resource unless the
process terminates.  

Turning off searching and restarting apache (or waiting long enough)
completely eliminates the problem.  

I think I'll try switching to 0.9.4

Thanks for all of the help


On Mon, 2006-03-13 at 18:17 +0100, R. Mattes wrote:
> On Mon, 2006-03-13 at 16:36 +0000, Olly Betts wrote:
> > On Mon, Mar 13, 2006 at 01:47:25PM +0000, Gavin Ellis Mendel-Gleason wrote:
> > > I'm using
> > >  
> > > $database = null; 
> > > 
> > > after every query, but this doesn't seem to help. 
> > 
> > Hmm, that's what I was about to suggest.
> Somehow i wonder whether this is really a Xapian
> problem at all. Gavin, are you shure that the database
> handles leek FDs? Running out of file descriptors is a
> classic problem for untuned servers on medium to high
> traffic sites. What worker model do you use? Are your
> Ulimits settings appropriate? Did you tune your kernel
> filesystem parameters? Did you tune your TCP stack (the
> old FIN_WAIT problem). My last encounter with the FD-
> problem was a broken firewall that didn't close client
> sockets - ugh!
> Can you monitor what file handles stay open? Just grab
> the PID of a server child process (_not_ the parent daemon) 
> and do: lsof -p <PID>
> At the same time, check who has a handle on the DB:
>  fuser -p /your/path/to/data/base/default/termlixt_baseA
>  HTH Ralf Mattes
> > What Xapian version are you using?
> > 
> > Cheers,
> >     Olly
> > 
> > _______________________________________________
> > Xapian-discuss mailing list
> > Xapian-discuss at lists.xapian.org
> > http://lists.xapian.org/mailman/listinfo/xapian-discuss

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