Re: slow shutdowns

[Donn Cave <donn@u.washington.edu>]

On Jan 25, 2007, at 6:49 AM, Aaron Richton wrote:

> On Thu, 25 Jan 2007, Howard Chu wrote:
>
> > matthew sporleder wrote:
> > > I'm running a pretty large slapd 2.3.23 (3G-5G or so) and  
> > > shutdown is
> > > taking anywhere from twenty minutes to an hour.  (I'm still waiting
> > > for a shutdown and hoping for an hour)
> > > I was just wondering what exactly was happening.  I suspect that  
> > > it's
> > > something in bdb_db_close(), but I'm not sure what's really going on
> > > since truss is just sitting around and prstat reports the pid in
> > > sleep.
> > > My guess is that it's walking the entire cache and free-ing it,  
> > > but I
> > > would expect the memory to change or the truss to return free's in
> > > that case.  Any ideas?  My last log messages are:
> > > daemon: shutdown requested and initiated.
> > > slapd shutdown: waiting for 0 threads to terminate
> >
> > Attach to it with gdb and get a stack trace.
>
> Always good advice, but given that heavy disk activity, do you have  
> an appropriate checkpoint directive set?

Symptoms would be 1) problem occurs only after some period of real
activity, not when stopped immediately after start, and 2) large
fraction of time in I/O wait state (cf. top, vmstat.)  I don't know
for sure what an appropriate checkpoint would be, but I know what
happens without one.

	Donn Cave, donn@u.washington.edu