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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!sgiblab!sti!sti!not-for-mail
- From: westes@smurf.sti.com (Will Estes)
- Newsgroups: comp.unix.wizards,comp.unix.admin
- Subject: Causes Of Death On Heavily-Loaded UNIX System?
- Date: 14 Dec 1992 20:08:19 -0800
- Organization: Mail Group
- Lines: 27
- Message-ID: <1gjlnjINN9eb@smurf.sti.com>
- NNTP-Posting-Host: smurf.sti.com
-
- A local SunOS host is experiencing extremely poor performance, and I am
- interested in understanding a little more about the dynamics of UNIX
- performance given a large number of users. The system in question is a
- SPARC2 system that routinely gets about 80 users on it. The workload
- mix is probably something like this:
-
- 50% mail
- 30% news
- 20% compiles or other activities with heavy file I/O
-
- A typical symptom of poor performance on the subject system would be
- very slow character echoing in a vi session, with occasional delays of
- as much as 15 seconds when you type a character.
-
- What are the major factors that contribute to performance death on a
- system that is heavily loaded by the sheer number of users? If you
- could list the major causes of system slowdown, what would be the
- percentage contribution of each cause to the total slowdown of performance
- of the system?
-
- I realize that performance is a very complex topic, and a lot depends on
- particulars of a situation. Still, I am hoping that some
- generalizations can be made, even based on the sparse facts listed
- above. Thanks to all who respond.
-
- --
- Will Estes Internet: westes@netcom.com
-