On Tue, 2 Dec 2003, Ed Phillips wrote:
> On Tue, 2 Dec 2003, Ken McKittrick wrote:
>
> > Hello
> >
> > I have Postfix 2.0.16, Amavisd-new, SpamAssassin, and Clamav 0.65
> > running on a Enterprise 4500 with 8 CPU's. It's configured to use 16
> > Amavisd processess and the Clamav.conf has MaxThreads set to 40. I only
> > see 6 clamd threads. I don't think that Clamd is keeping up with
> > Amavisd.
>
> From looking at the source, clamd appears to allocate a thread when a
> request comes in... and then the thread exits. It doesn't pre-allocate
> MaxThreads threads and have them sit idle waiting for work...
Also, from another glance at the source, it appears that clamd will go
into a "buzz-loop" waiting for a free thread slot if there are already
MaxThreads threads active. Not the best solution for the "busiest"
scenario... having the clamd parent process use as much CPU as possible
when every thread is already busy... but technically, it works, I guess
... although I don't see any mutex being used during inspection of
ths[i].active near line 546 in clamd/server.c - multiple threads should
use mutexes when accessing the same memory.
It'd be nice if it would use a call to intelligently wait for a thread to
exit, or even wait 20 msec or *something* instead of the "buzz-loop"...
Ed
> Hope this helps!
>
> Ed
>
> > Any ideas on how to get more Clamd threads?
> >
> > 25825 vscan 28M 23M run 20 0 0:00.10 3.6% amavisd/1
> > 25957 vscan 28M 21M run 20 0 0:00.08 3.5% amavisd/1
> > 25978 vscan 28M 21M run 20 0 0:00.07 3.0% amavisd/1
> > 26030 vscan 28M 20M cpu8 30 0 0:00.06 2.8% amavisd/1
> > 26022 vscan 28M 21M run 20 0 0:00.05 2.5% amavisd/1
> > 26094 vscan 27M 20M run 20 0 0:00.04 2.3% amavisd/1
> > 25984 vscan 27M 20M run 20 0 0:00.05 2.3% amavisd/1
> > 26131 vscan 27M 20M sleep 20 0 0:00.04 2.0% amavisd/1
> > 26182 vscan 27M 20M run 20 0 0:00.02 1.5% amavisd/1
> > 12752 vscan 10M 9416K sleep 58 0 0:00.09 1.5% clamd/6
> > 26247 vscan 27M 20M cpu13 20 0 0:00.02 1.2% amavisd/1
> > 26252 vscan 26M 19M run 30 0 0:00.01 1.0% amavisd/1
> > 26265 vscan 27M 19M cpu1 30 0 0:00.01 0.9% amavisd/1
> > 26267 vscan 26M 19M run 20 0 0:00.01 0.8% amavisd/1
> >
> > Thanks
> > Ken McKittrick
> > USADatanet
Ed Phillips <[EMAIL PROTECTED]> University of Delaware (302) 831-6082
Systems Programmer III, Network and Systems Services
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