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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. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Exmh CVS iD8DBQFCAnIKMJF5cimLx9ARApyGAJwPkv75ru8QKrXFjbUsyYgqA7LcUgCdF9qe iNfC6S+6PEerFj/jIzuEzsI= =FL0+ -----END PGP SIGNATURE-----
