Re: Parallelizing Spam Assassin

On Jul 31, 2009, at 1:55 AM, poifgh wrote:
> I ran freshly build SA with Bayes and DNSBL turned off. Why am I not  
> seeing
> a linear increase in the throughput? Is a file locking creating the
> bottleneck? If yes, which particular file is being locked? If no,  
> what could
> be the reason for this?

There could be many reasons, check out my talk (admittedly out of date  
a little but should still be mostly relevant) on High Performance  
Apache SpamAssassin at the following link:

http://people.apache.org/~parker/presentations/index.html

Keep in mind that you might also be seeing other factors like memory  
and disk I/O contention.  You don't really spell out your testing  
infrastructure so its not real clear if you're even performing a valid  
test.

Also, I wouldn't necessarily expect to see a linear increase, although  
you might be able to take some easy steps for increasing your overall  
performance.

Michael