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From: globus@nas.nasa.gov (Al Globus)
Newsgroups: comp.sys.sgi
Subject: shared memory and swapping
Message-ID: <GLOBUS.90Dec13174349@wk208.nas.nasa.gov>
Date: 13 Dec 90 22:43:49 GMT
Sender: news@nas.nasa.gov
Reply-To: globus@nas.nasa.gov
Distribution: comp
Organization: Applied Research Office, NASA Ames Research Center
Lines: 11

Does SGI OS 3.3.1 lock shared memory regions in core?  I have
some evidence that it does.

I'm using the FAST visualization environment.  It puts solution
data in shared memory.  Solution data is big.  If I leave the
solutions in shared memory and do something else that requires
a lot of memory (but no the solutions) I get a ton of swapping.
If I then delete the solutions (in shared memory), I see the
memory usage in 'gr_osview -a' go down!  But I haven't accessed
the solution data for a while and it should have been paged out.
Any ideas about what's going on?  Thanx.