rdump from VAX to DS5400 (use dd, not rdump!)
Ian! D. Allen [CGL]
idallen at watcgl.waterloo.edu
Tue Jul 17 01:11:16 AEST 1990
Some timings you might be interested in.
Ultrix dump of root to nowhere:
bandicoot# time dump 0f - / >/dev/null
[dump stuff deleted]
16% real=0:22 usr=0.9 sys=2.7 rd=8 wr=4 mem=332 pg=0 rec=0 sw=0
sig=0 cs=959
BSD dump of root to nowhere:
bandicoot# /software/dumpster/maintenance/dump 0f - / >/dev/null
[dump stuff deleted]
6% real=0:31 usr=1.0 sys=1.2 rd=10 wr=14 mem=252 pg=10 rec=46 sw=0
sig=0 cs=582
Ultrix rdump of root to nowhere:
bandicoot# time /bin/rdump -0f bandicoot:/dev/null /
[dump stuff deleted]
39% real=0:55 usr=2.8 sys=19.1 rd=2 wr=6 mem=282 pg=3 rec=60 sw=0
sig=0 cs=4533
BSD rdump of root to nowhere:
bandicoot# time /software/dumpster/maintenance/rdump
-0f bandicoot:/dev/null /
[dump stuff deleted]
33% real=0:39 usr=1.9 sys=11.2 rd=10 wr=17 mem=283 pg=12 rec=64 sw=0
sig=0 cs=5002
Ultrix rdump of root to a real tape:
bandicoot# time rdump -0f recorder:/dev/nrmt0h /
[dump stuff deleted]
[I hit break after 6 minutes when dump estimated the dump
would take another 20 minutes]
BSD rdump of root to a real tape:
bandicoot# time /software/dumpster/maintenance/rdump
-0f recorder:/dev/nrmt0h /
[dump stuff deleted]
[I hit break after 7 minutes when dump estimated the dump
would take another 13 minutes]
Ultrix dump of root to rsh/dd to a tape:
bandicoot# time dump 0f - / | rsh rec dd bs=32k rbuf=2 wbuf=2 of=/dev/rmt0h
[dump stuff deleted]
7% real=1:31 usr=1.0 sys=6.0 rd=2 wr=4 mem=351 pg=0 rec=3 sw=0
sig=0 cs=4900
15% real=2:48 usr=2.5 sys=24.1 rd=15 wr=7 mem=206 pg=0 rec=3
sw=0 sig=0 cs=10300
BSD dump of root to rsh/dd to a tape:
bandicoot# time /software/dumpster/maintenance/dump 0f - /
| rsh rec dd bs=32k rbuf=2 wbuf=2 of=/dev/rmt0h
[dump stuff deleted]
2% real=1:31 usr=1.0 sys=1.1 rd=5 wr=16 mem=216 pg=2 rec=54 sw=0
sig=0 cs=534
13% real=2:53 usr=2.7 sys=20.7 rd=11 wr=16 mem=159 pg=2 rec=54
sw=0 sig=0 cs=6983
What I learned:
Don't use rdump. It's an order of magnitude slower than a pipe to dd.
In fact, even dump is slower than dump to stdout piped into dd with
wbuf=2, because of bugs in the Ultrix nbuf code. At least Ultrix dd
handles multiple tapes and multi-buffer writes; isn't that convenient?
--
-IAN! (Ian! D. Allen) idallen at watcgl.uwaterloo.ca idallen at watcgl.waterloo.edu
[129.97.128.64] Computer Graphics Lab/University of Waterloo/Ontario/Canada
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