Path: utzoo!attcan!uunet!dino!ux1.cso.uiuc.edu!brutus.cs.uiuc.edu!psuvax1!shire!schwartz
From: schwartz@shire.cs.psu.edu (Scott E. Schwartz)
Newsgroups: comp.sys.isis
Subject: failure detection?
Message-ID: <Epmj=c1@cs.psu.edu>
Date: 2 Mar 90 15:50:01 GMT
Sender: news@cs.psu.edu (Usenet)
Organization: Penn State University Computer Science
Lines: 16


Hi all,
	Playing with Isis I've noticed something which surprised me.
If I run several instances of the grid demo I can kill and restart
individual processes with no problem.  But if I send SIGTSTP (i.e,
control-Z) to one of them, they all hang, seemingly forever, or until I
continue the stopped job.  I expected Isis to eventually decide that
the stopped participant had failed and continue without it.  Worse, if
I wait too long before allowing the stopped process to continue, the
system never seems to recover at all.  Have I misunderstood something
crucial?  This is on a sun4/260 under 4.0.3.


--
Scott Schwartz		schwartz@cs.psu.edu
"the same idea is applied today in the use of slide rules." -- Don Knuth