Is a Sun3/60 *really* Faster than a Vax3600?
R. J. Auletta
rauletta at gmuvax2.gmu.edu
Wed Jul 4 13:33:40 AEST 1990
I was trying to measure relative disk performance
on a new disk drive on Sun3/60. So I tried cp'ing
a 1.5Meg file on three machines.
The csh time command reported the following numbers for
a 3/60, Vax3600, Vax8530 all on local disks.
3/60 with 25Meg of Memory, one user. (Sun OS)
0.0u 0.8s 0:01 74%
8530 with about 60Meg of Memory, 25 users (Ultrix).
0.0u .7s :01 76%
Vax3600, 16Meg of Memory, 1 user, but two inactive diskless VS2000
clients (no users logged on.) Drive is an RA82. (Ultrix)
0.0u 1.5s 0:07 20%
The most striking difference is the percentage of CPU's cycles
each cp used over the period it was active with the VAX3600
quite low. I would interpret this being due to a another CPU
intensive process running, but nothing showed up with top or ps.
Otherwise, if I read this right, the CPU is waiting on the
RA82?
My question is, is the combination of a VAX3600 and RA82 really
that much of a dog, or is there someother explanation in
our configuration?
--Rich Auletta
rauletta at gmuvax2.gmu.edu
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