ps comamnd on linux we can specify the width of fields. The rss size is too small for us and cfengine complains:
 - Unacceptable model uncertainty examining processes

This fix issue:
 - https://dev.cfengine.com/issues/6337
Merge pull request #1863 from basvandervlies/big_rss_value_issue_6337

ps comamnd on linux we can specify the width of fields.