I have a server with very little memory. It's primarily an application server, but apache and exim are running for very light use. I'd like to ensure that apache and exim never starve other programs for memory by limiting their resident set sizes to a total of 6 and 4 megs apiece. I'm fine with these running slowly. How can I accomplish this? /etc/security/limits.conf doesn't apply for daemons so far as I can tell, as these aren't ever run as logon scripts. bash's inbuilt ulimit command doesn't seem to include an RSS option, so I'm not sure I can run that before each daemon to force the resident set size.
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