Tuning up an Ultrix system? HELP
Alan's Home for Wayward Notes File.
alan at shodha.dec.com
Fri Feb 23 04:06:21 AEST 1990
In article <1872 at wheaton.UUCP>, stefan at wheaton.UUCP (Stefan Brandle ) writes:
> r b w avm fre re at pi po fr de sr r0 r2 x2 x3 in sy cs us sy id
> 2 0 0 671 5911 0 0 0 0 0 0 0 2 0 0 0 85 73 14 10 20 70
> 1 1 0 710 5865 0 0 0 0 0 0 0 2 0 0 0 901 256 10 5 65 31
> 1 0 0 313 5865 0 0 0 0 0 0 0 0 0 0 0 950 262 9 7 80 13
> 1 0 0 542 5865 0 0 0 0 0 0 0 1 1 0 0 956 268 10 6 84 9
> 1 0 0 476 5865 0 0 0 0 0 0 0 1 3 0 0 475 147 26 6 76 18
I may have previously commented that I didn't have the
experience in determining when the number of interupts
was "too many". Sometimes though it's pretty obvious.
The real question though is where are they all coming
from? The first place I'd look at this point is to what
the tty I/O is like. Does seem be a relationship between
the high number of interrupts and either tty input or tty
output? (Use iostat(1) to look at tty I/O).
What are you using the console port for? Keep it find that
the console interface is real braindead serial line. Every
character input or output over it causes an interrupt.
> procs memory page disk faults cpu
> r b w avm fre re at pi po fr de sr r0 r2 x2 x3 in sy cs us sy id
> 1 0 0 1066 5787 4 10 5 0 0 0 0 3 1 0 0 491 205 25 19 75 7
The paging blip is probably somebody starting up a program.
>
> I can reschedule news--I know how to do that--but wonder whether
> there is anything else that can be modified kernel-wise that will make a
> significant difference. My guess is no, but maybe somebody has ideas.
Unfortunately there is very little in the kernel that can be
"tuned". What you usually have to do is look at all the
different *stat programs to find out where the bottlenecks
or problems are and then see if you can get rid of them or
balance around them.
>
> -stefan
> --
> ------------------------------------------- MA Bell: (708) 260-5019 ---------
> Stefan Brandle UUCP: ...!{obdient,uunet!tellab5}!wheaton!stefan
> Wheaton College or stefan at wheaton.UUCP
> Wheaton, IL 60187 "But I never claimed to be sane!"
--
Alan Rollow alan at nabeth.enet.dec.com
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