RE: RESIDENT and PDQ

Posted in 1999

Watson, Paul — Tue, 23 Mar 1999 08:48:48 -0000 — source: Informix-list mailing list archive (1991-1998)

It means that the OS should not swap the SHM segments out if the machine get short of memory. But since SVR4 you very rarely swap I think it now prevents the page daemon using the pages allocated to the SHM. AFAIK depending on the OS, the SHM might still be paged out even when it is set as the 'forced residency' is only a request not to use this memory unless you really have to. Yes it should make the system quicker Paul Watson # WF Software Ltd # Any answer given Tel: +44 1463 674729 # could be totally Fax: +44 1463 678729 # fictitious www.wfsoftware.com # > -----Original Message----- > From: olaf@uksd.com [mailto:olaf@uksd.com] > Sent: 22 March 1999 20:10 > To: informix-list@iiug.org > Subject: RESIDENT and PDQ > > > Can anyone explain what resident = 1 means and what the advantage of > setting it is ? More performance ??? > > What effect does the PDQ-Parameters have ? > > GREETINGS OLAF >