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- Path: sparky!uunet!olivea!tymix!comet!feldman
- From: feldman@comet.Tymnet.COM (Steve Feldman)
- Newsgroups: comp.sys.sun.admin
- Subject: Re: Sun 690MP performance problems
- Message-ID: <2436@tymix.Tymnet.COM>
- Date: 2 Sep 92 00:40:49 GMT
- References: <2A9FA7FE.2305@orion.oac.uci.edu>
- Sender: usenet@tymix.Tymnet.COM
- Organization: BT North America (Tymnet)
- Lines: 28
- Nntp-Posting-Host: comet
-
- In article <2A9FA7FE.2305@orion.oac.uci.edu> iglesias@draco.acs.uci.edu (Mike Iglesias) writes:
- >Since we cut over to the 690MP, we have had unsatisfactory performance on
- >the 690MP, both for the timesharing users and the people reading news via
- >nntp. We have installed the MP performance patches from Sun and they have
- >helped, but the performance is still not as good as the Sequent was with
- >the same load. We see a lot of processes (mostly the nntpd daemons)
- >in "D" state when the system performance gets bad. Response time for
- >online users gets slow - people using the Gnu Emacs mhe mail package
- >wait a long time (minutes in some cases) for response to commands, "df"
- >takes up to a minute to complete, etc.
-
- I have seen problems similar to this on a Sparcstation 1+ which is our
- campus mail gateway and news server. This machine gets very little
- interactive use, and the mail load is fairly light, so most of what it does
- is news processing and nntp. It has two SCSI disks. The symptoms sound
- remarkably similar to what you've reported, but since our machine isn't
- used as a timesharing system I haven't worried about it too much.
-
- It has even happened even when I'm the only user logged in, but only when
- nntp is receiving news from our main feed. I have speculated that it might
- be due to contention for the SCSI bus or the one drive which unfortunately
- has root, some swap, usr, and /var/spool/news on it. It also seems to be
- connected to file lookups, rather than actual reads/writes.
-
- Perhaps if you found another machine to process news, your interactive
- performance would improve.
- Steve Feldman
- BT North America (Tymnet)
-