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- Newsgroups: news.sysadmin
- Path: sparky!uunet!gatech!news.byu.edu!eff!ckd
- From: ckd@eff.org (Christopher Davis)
- Subject: Re: Cnews Performance
- In-Reply-To: jstewart@alfred.carleton.ca's message of Tue, 21 Jul 1992 16:08:50 GMT
- Message-ID: <CKD.92Jul21164839@loiosh.eff.org>
- Sender: usenet@eff.org (NNTP News Poster)
- Nntp-Posting-Host: loiosh.eff.org
- Organization: Electronic Frontier Foundation Tech Central
- References: <1992Jul21.143918.4244@informatik.uni-ulm.de> <jstewart.711734930@cunews>
- Date: Tue, 21 Jul 1992 20:50:46 GMT
- Lines: 48
-
- John> == John Stewart <jstewart@alfred.carleton.ca>
-
- John> Assuming the machine is used primarily for news service, disk
- John> accesses to /usr/spool/news will greatly exceed all other disk io
- John> combined. It would therefore be better to also put the OS on the
- John> new disk to reduce disk accesses on the old disk.
-
- John> On our machine we have 3 disks that are allocated as follows.
-
- John> Disk 1 root file system, /usr and /usr/lib/newsbin
- John> Disk 2 /usr/spool/news and some rarely accessed archives
- John> Disk 3 /usr/lib/news, home directories and a few miscellaneous
- John> things
-
- John> One more way to reduce your disk accesses is to mount /tmp as a tmpfs
- John> (memory resident directory).
-
- Agreed. Our news/ftp/WAIS machine has four drives (it's a 32M SS2):
-
- sd0: root, swap, /usr (including newsbin) [424 internal]
- sd1: more swap, /var, /home (small, no users), /libnews, ftp and WAIS [1.3G]
- sd2: /src, scratch (used for big builds like X11R5) [600M]
- sd3: /news [1.3G]
-
- The 600 is an old Wren something-or-other, not too slow, but not
- blazing. The 1.3s and 424 are Sun (the 1.3s are the Seagate Elites,
- which are pretty zippy; the 424 is a Quantum, I think). We use tmpfs.
-
- Right now this sucker screams along with an ever-growing number of
- nntplink news feeds, over 2K groups (including clarinet), heavy ftp
- traffic, and some WAIS. The load is usually about 1, almost always less
- than 2; we do a newsrun every 5 minutes from cron, and run a pretty
- stock 22-Dec (non-Performance-Release) C news. No msgidd, no daemonized
- relaynews, we haven't even patched C news to put the pathname in
- /usr/lib/news/log, so nntplink is doing huge quantities of history
- lookups. Expire is nice and quick, too. If the machine ever starts
- gasping, it goes to 64M RAM; no signs of it, yet.
-
- C news is no slouch. I left news locked for a while (a couple hours, I
- think) once as an unscientific test; the load went up to about 2.5 for
- maybe 5 minutes before catching up with all the incoming news... big deal.
-
- Again, this isn't even the Performance Release.
- --
- Christopher Davis * ckd@eff.org * System Administrator, EFF * +1 617 864 0665
- ``The First Amendment is often inconvenient. But that is besides the
- point. Inconvenience does not absolve the government of its obligation
- to tolerate speech.'' --Justice Anthony Kennedy, in 91-155
-