smb@tove.cs.umd.edu (Steve M. Burinsky) (03/19/91)
Is vmstat broken? Two fields of significant interest to me, namely avm and sr, are always 0. Avm is the number of active Kbytes of virtual memory. Sr is the number of pages scanned per second by the clock algorithm. How can I get good numbers? I've seen this behavior on both a 4/60 running SunOS 4.0.3c and a 3/280 running SunOS 4.1.1. Steve Burinsky smb@tove.cs.umd.edu
cd@sei.cmu.edu (Chas DiFatta) (03/22/91)
We have a 4/490 that's *very* heavily overloaded by bulk NFS traffic, X terminal sessions, etc etc. Does anyone know if vmstat(1) can be trusted to give some type of reasonable representation of virtual memory statistics. The OS version is 4.1_PSR_A. Chas DiFatta chas@sei.cmu.edu
smc@styx.desktalk.com (Steven M Cohn) (04/02/91)
Regarding the two questions on vmstat(8) in v10n57, vmstat is somewhat brain dead. I was up in Milpitas at Sun's advanced System Administration class, and our instructor told us that both fields 'avm' and 'at' were meaningless. On my system, they are always zero. I usually get good data for sr, however, the system must be pretty heavily loaded to get a value. In general, you have to be paging fairly heavily to get this number above zero for any length of time. I have class notes available by fax for anyone really interested. Steve Cohn smc@desktalk.com