Path: utzoo!yunexus!maccs!dan
From: dan@maccs.McMaster.CA (Dan Trottier)
Newsgroups: can.sun-stroke
Subject: Sun 4/280 heavy swapping
Keywords: swapping Sun 4/280 out-of-control
Message-ID: <1300@maccs.McMaster.CA>
Date: 7 Jul 88 16:39:15 GMT
Article-I.D.: maccs.1300
Reply-To: dan@maccs.UUCP (Dan Trottier)
Distribution: can
Organization: McMaster U., Hamilton, Ont., Can.
Lines: 36

I'm not sure if this is the correct forum for this kind of question
but here goes anyway.

We have a Sun 4/280 running Sun OS3.2-4 and have had very few problems
with it. Today for the second time since we received the machine I noticed
that almost all the processes were being swapped! I can't seem to find 
what is causing this erratic behaviour.

The output from vmstat shows that there is at least one process that is
I/O blocked. Here is the output from vmstat:

 procs     memory                       page      disk  faults          cpu
 r b w   avm  fre  re at  pi  po  fr  de  sr x0 x1 x2 x3  in  sy  cs us sy id
 0 3 0  194412176   0  0   0   0   0 728   0  2  0  0  0   8  23   8 29  1 69
 1 1 0  231211792   0  0   0   0   0 536   0 12  0  0  0  32 617  49 70 14 17
 1 1 0  231211792   0  0   0   0   0 400   0 12  0  0  0  23 403  40 78  8 14
 0 2 0  214411648   0  0   0   0   0 400   0 13  0  0  0  22 302  35 77  7 16
 0 2 0  214411648   0  0   0   0   0 296   0 11  0  0  0  19 241  34 79  9 12
 1 1 0  214411672   0  1   0   0   0 336   0 15  0  0  0  30 232  43 74  8 18
 1 1 0  195211632   0  1  16   0   0 576   0 36  0  0  0  39 156  49 19  9 73

It looks like the system interrupt level is pretty high and at the moment there
are only 4 people using the machine. The last time this happened I had to 
reboot the machine to bring it back to normal. Today I'm going to wait for
a while to see what happens.

By the way how many of you have received Sun OS4.0? I would have thought we
would have seen it by now! Does it really improve system performance like
some of the rumors say?

Thanks,

dan
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