802 copies of dccm running

Gary Mills mills@cc.umanitoba.ca
Tue Dec 19 19:52:50 UTC 2006

On Mon, Dec 18, 2006 at 02:56:44PM -0700, Vernon Schryver wrote:
> > From: Gary Mills 
> > Reverting to the old configuration brought it back to normal.  I'm
> > using dcc-1.3.31.  Might this work better in a later version?
> The next version, 1.3.46, will be more agressive in shutting down
> unneeded helper processes.  It will also have -Bset:maxjobs=X to override
> the default limit on the number of helper processes.  The default is
> the same as the -j value.
> I think the current version, 1.3.45, has some fixes related to helpers
> waiting too long for DNS answers.

I'll give that a try soon.

> I don't understand why the load average on the system would be significantly
> increased by the dccm DNS helper processes.  All they do is call the DNS
> resolver library.  Going from 1 sendmail process plus 1 dccm thread to
> 1 sendmail process plush 1 dccm thread plus 1 dccm/DNS process does not
> sound like a prescription for a 12X increase in load average since only
> one of the 2 or 3 mechanisms will be runable at any time.

I don't understand either.  I'll keep a closer eye on it next time
I do some testing.

> Do you have any machinery that might speed up DNS blacklist lookups
> such as rndsbl?

Yes, I'm running that.

-Gary Mills-    -Unix Support-    -U of M Academic Computing and Networking-

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