Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!ucbvax!agate!agate!dpassage From: dpassage@soda.berkeley.edu (David G. Paschich) Newsgroups: comp.sys.apollo Subject: DN4500 arbitrarily overloads itself (was Re: (none)) Message-ID: Date: 20 Jun 91 20:23:44 GMT References: <0677436884@INESCN.RCCN.PT> Sender: usenet@agate.berkeley.edu (USENET Administrator) Organization: UC Berkeley's Open Computing Facility Lines: 31 In-Reply-To: JCF%INESCN.RCCN.PT@CUNYVM.CUNY.EDU's message of 20 Jun 91 16: 54:44 GMT In article <0677436884@INESCN.RCCN.PT>, JCF%INESCN.RCCN.PT@CUNYVM.CUNY.EDU (Joao Canas Ferreira) writes: One of our Apollos (a DN4500, Sr10.2) has developed the habit of slowing down so much, that it becames unusable. This behaviour seems to start out of the blue. Sometimes the users manage to logout, but it is usually impossible to login again: when you type the username the station locks up. Hitting the return key seems to have no effect. Using the backspace key causes some black squares to appear on the DM window, but no backspacing. During one of the last fits, the user tried to logout. After some time, he got the (almost) usual question (Blast ? (Y/N)). After answering Yes and waiting some time, the message 'Unable to obtain scfb hash table mutex lock from (stream manager/ scfb)' ? Sounds as if maybe your machine is hitting the 64 process limit that existed under SR 10.2. The machine we use as a mail gateway was continually having this problem. One work-around we used was to write a daemon which would watch for the existence of a certain file in `node_data, and when it appeared, kill all the sendmail processes on the machine. That way we didn't have to start a new process in order to get the machine useable again. The 64 process limit was thankfully raised in 10.3 to something more reasonable (32 processes/megabyte RAM, I believe). -- David G. Paschich Open Computing Facility UC Berkeley dpassage@ocf.berkeley.edu "Can Spam increase sexual potency? `No!' say scientists!" -- Trygve Lode