Re: Memory requirement for SpamAssassin/Postfix/Roundcube/Dovecot stack

[Kris Deugau <kd...@vianet.ca>]

Grant Taylor wrote:
> On 5/26/22 8:32 AM, Ian Evans wrote:
>> Is it safe to assume that a $5/mth 1gig memory account will laugh at 
>> the resources needed to run 
>> a SpamAssassin/Postfix/Roundcube/Dovecot/Nginx stack and not ever 
>> break a sweat?
> 
> Sadly, I found that I needed to quit tilting at the 1GB memory windmill 
> and upgraded my tiny VPSs to 2GB for SpamAssassin + ClamAV + some other 
> milters.
> 
> You /might/ be able to get SpamAssassin in 1GB, but I don't know what 
> else will be on the system.

Clam is the memory hog.  With a bit of tweaking you could run everything 
else for a low-volume mail server in 256M - probably including webmail.

Here's a snapshot of my personal system colocated at work  Notice that 
clamd is third in line to gobble up RAM after a couple of VMs...  and 
that's strictly with stock signatures.  SpamAssassin is also mostly 
stock, although I think I bumped the spamd child limit up from default.

11480 libvirt+  20   0   15.7g   2.9g  24156 S   1.0   9.2   6432:10 
qemu-system-x86
  1262 libvirt+  20   0 6509464   1.7g  21324 S   1.0   5.3   1042:56 
qemu-system-x86
26531 clamav    20   0 1652780   1.2g  10840 S   0.0   4.0  37:14.45 
clamd
  1389 www-data  20   0  504660 301888  30464 S   0.0   0.9  10:19.54 
apache2
[snip ~10 Apache processes]
26020 root      20   0  145152 124852   7812 S   0.0   0.4   1:46.78 
spamd child
  7908 defang    20   0  127212 115944  14756 S   0.0   0.4   1:37.65 
mimedefang.pl
30084 root      20   0  132296 111632   7388 S   0.0   0.3   0:11.91 
spamd child
26233 defang    20   0  119112 108324  13488 S   0.0   0.3   0:01.76 
mimedefang.pl
29297 bind      20   0  707620 104780  11088 S   0.0   0.3  30:05.75 
named
26021 root      20   0  123924 102984   7388 S   0.0   0.3   0:01.46 
spamd child
30101 root      20   0  120960  98164   6008 S   0.0   0.3   0:04.21 
spamd child
27041 root      20   0  116648  89448   6364 S   0.0   0.3  13:19.88 
spamd
27055 root      20   0  116648  85360   1972 S   0.0   0.3   0:00.05 
spamd child
  7744 postgres  20   0  211576  66764  64776 S   0.0   0.2   0:08.76 
postgres

-kgd