Subject: Re: high-volume INN server on netbsd, mmap(), and expire
To: Alexis Rosen <>
From: Brian Buhrow <>
List: current-users
Date: 08/04/1997 12:40:47
	Have you tried getting a ktrace output of the two programs to see how
they differ in their behavior?  Perhaps that would point to the option that
needs tuning.

On Aug 4,  2:28pm, Alexis Rosen wrote:
} Subject: Re: high-volume INN server on netbsd, mmap(), and expire
} On Mon, Aug 04, 1997 at 02:52:08PM +0300, Jarkko Torppa said:
} > > I'm running INN 1.5.1 on netbsd 1.2. It's time to upgrade both of them,
} > > and I have two questions that I was hoping someone might be able to answer:
} > > 
} > > 1) mmap()- Has anyone had any problem with using the mmap() support in the
} > > dbz library? What about the shared-active patch or actived? As I understand
} > > it, this *should* work just fine. Does it? I'd *really* hate to find out
} > > the hard way...
} > 
} > mmap has worked fine for me, you have to enable the actsync option in there 
} > though. Shared active did'nt compile for me when (1.4unoff) I tried it and I 
} > havent tred again.
} ?? Actsync is for updating an active file from another host. Do you mean
} ACT_STYLE should be set to MMAP?
} > > 2) I have expire built and running, and for the last year or two it has
} > > worked fine, cranking through a 300-400MB history file in 10-20 minutes.
} > > However, I can't reproduce this binary! I've built expire from 1.5, 1.5.1,
} > > and even 1.4u4, but no matter what I try, I get a version that runs just
} > > fine, but ~150-200 *times* slower than the expire I'm using.
} > 
} > Check the ulimits on the expire, if it can't do dbzincore for the history db 
} > it is slow.
} No kidding...
} And Perry said:
} > Maybe you don't have things set to do the "list expired files to a
} > file first" thing...
} Scott suggests the same thing:
} > Hmm.  I'm really shooting in the dark here, but did you verify that the
} > `delayrm' option is being specified for the news.daily script?
} David offers this:
} >         I've had this same problem.  The news.daily run is a real
} > memory pig. You need to unlimit the datasize right at the start of
} > news.daily and then the expire run will complete in the proper amount
} > of time. [explains about ulimit]
} I wish it were as simple as any of these. News.daily has had a ulimit for
} ages, and I always use delayrm (I run multiple parallel fastrms on separate
} spool disks- it's very effective).
} In fact, on the *same* machine, if I type
} 	/usr/local/news/bin/expire -n -z /tmp/arts &
} I can see it rocketing through the expire file at many MB/min. (Although,
} interestingly, the machine can take up to a minute to ls the NEWSLIB while
} it's going.) If I type
} 	/usr/local/news/bin/ -n -z /tmp/arts &
} the machine ambles through the history file at perhaps 250-500KB/min. I do
} these things one after the other, immediately, with all environmental factors
} exactly the same (ulimit, disk characteristics, etc.).
} Since nobody said "oh, I know what's wrong, it's...", I'd like to ask
} those who wrote who have a working expire to send me their files.
} I'll see if I can compare them against mine and turn up what's wrong.
} Thanks,
} /a
} ---
} Alexis Rosen   Owner/Sysadmin,
} PANIX Public Access Unix & Internet, NYC.
>-- End of excerpt from Alexis Rosen