Re: SpamAssassin 3 memory usage

[Justin Mason <jm...@jmason.org>]

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Matt Kettler writes:
> At 07:24 AM 2/3/2005, Sander Holthaus - Orange XL wrote:
> >I've noticed that my current memory consumption of spamd (3.x), when using a
> >number of custom rule-sets such as SARE, is relatively high (~50MB according
> >to ps). When running with a large number of children, this would consume
> >quite a large portion of memory.
> >Or am I wrong here, and is a portion of that 50MB per child actually shared?
> 
> That's up to your OS.. Much of the 50MB is sharable, but you'll need an OS 
> that does "read only, copy-on-update" (aka RCU) type forking.
> 
> Newer versions of Linux do this, and you can generally tell by looking at 
> PS.. Most RCU type OSes will one spamd child will be large, and the others 
> will be less than half the size. Some more oddball variants wind up always 
> reporting the parent size, even if the pages are shared, so you might need 
> to check the math by adding them up and comparing to the total mem 
> availability in top. 

actually, all versions of linux since 2.2.* do this -- it's Copy-on-Write,
not RCU ;)

and don't pay attention to what ps or top report on 2.4.x (where x >= 18)
or 2.6.x -- they report memory sharing incorrectly.

- --j.
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