Limiting Child Processes - SpamAssassin

["BruceG" <bruce-lists@manygriffi.blogdns.net>]

Hey all,

      I think this was answered on this list a few weeks ago, but as usual,
my attention was elsewhere. Anyway - is there a way to limit the number of
child processes SpamAssassin can spawn?

      I am running fetchmail, exim4-heavy-daemon and ClamAV. I had
SpamAssasin running, but my PC started thrashing on heavier volumes of
e-mail. (my PC could handle a couple e-mails with both ClamAV and SA, but
had constant disk io and I was unable to ssh to it when going through larger
volumes of e-mail).