On Thu, Jun 17, 2010 at 10:43:14AM -0400, Mark G. Thomas wrote:
> On Wed, Jun 09, 2010 at 09:29:30AM -0500, Gary Mills wrote:
> > On Wed, Jun 09, 2010 at 01:33:21PM +0000, Vernon Schryver wrote:
> > > > From: Gary Mills <[email protected]>
> > >
> > > > The upgrade from dcc-1.3.122 (32 bit) to dcc-1.3.125 (64 bit) was
> > > > flawless. However, we now have a problem with writes from dccd
> > > > saturating the disk. The I/O bandwidth is often 100% utilized.
> > > > Other processes that need to read from the disk are stalling.
> > >
> > > If the system has enough RAM to contain the hash table of dcc_db.hash
> > > and the recent part of dcc_db, then the best tactic is the work-around
> > > for Solaris's lack of mmap(MAP_NOSYNC). That -around is to move
> > > dcc_db.hash (but of course not dcc_db) to a memory mapped file system.
> > > /tmp is often a RAM file system on Solaris systems, so adding -H/tmp
> > > to DBCLEAN_ARGS in dcc_conf should be effective.
> >
> > The servers do have sufficient memory. I'll do some testing to see if
> > `-H/var/run/dcc' solves the problem.
>
> With 64bit Solaris-9, using /tmp has worked very well for me, and solved
> the disk I/O saturation problem. dccd is hovering around 6.6GB RAM, plus
> the 2GB for the tmpfs dcc_db.hash file.
Yes, it's similar here under Solaris 10. Here's part of the prstat
output on a quiet day:
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
1547 daemon 5387M 3359M sleep 59 0 2:16:52 0.1% dccd/1
1546 daemon 780M 456M sleep 59 0 0:10:38 0.0% dccd/1
1345 daemon 27M 24M sleep 59 0 3:38:09 0.0% dccm/172
1180 daemon 18M 15M sleep 59 0 1:28:54 0.0% opendkim/173
344 daemon 2996K 1412K sleep 59 0 0:04:55 0.0% rpcbind/1
2647 daemon 3808K 1784K sleep 59 0 0:01:42 0.0% dns-helper/1
795 daemon 3808K 2148K sleep 59 0 0:00:05 0.0% dns-helper/1
2620 daemon 3808K 1764K sleep 59 0 0:01:41 0.0% dns-helper/1
...
Total: 32 processes, 386 lwps, load averages: 1.62, 1.52, 1.41
--
-Gary Mills- -Unix Group- -Computer and Network Services-
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