Q: Monitoring swap usage

From: Kjell Andresen <kjell.andresen_at_usit.uio.no>
Date: Thu, 19 Sep 1996 13:32:20 +0200 (MET DST)

Hello!

If you have a program that makes it easy to monitor the usage of swap
space I'd like to get a piece of advice from you!

Primarilly osf/1 and DU - but solutions working under irix, sun, solaris,
aix, ultrix and hpux as well will be a favorite.

I also want you to explain the meaning of the indicated line produced by
"top" to me:

load averages: 0.58, 0.33, 0.24 13:09:50
236 processes: 1 running, 49 sleeping, 184 idle
Cpu states: 5.3% user, 0.0% nice, 8.6% system, 86.1% idle
Memory: Real: 33M/110M act/tot Virtual: 155M/390M use/tot Free: 1040K
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
uerf says about the same machine:
                 DEC OSF/1 V3.2 (Rev. 214); Wed Mar 6 09:05:43 MET 1996
                 physical memory = 128.00 megabytes.
                 available memory = 114.85 megabytes.
                 using 483 buffers containing 3.77 megabytes of memory

Q: What is free? what is memory? what is (disk)swapped? why aren't
these numbers identical? how much memory and swap is free? do the machine
need more memory? -swap? etc.

 /# vmstat 5 10 says: (sorry about the format here)
Virtual Memory Statistics: (pagesize = 8192)
  procs memory pages intr cpu
  r w u act free wire fault cow zero react pin pout in sy cs us
sy id
  3227 16 9647 188 3977 1M 188K 604K 67K 295K 27K 275 1K 473 4
5 91
  2228 16 9706 128 3978 330 15 289 0 11 0 208 891 372 10
5 85
  2228 16 9706 128 3978 223 0 221 1 2 1 217 840 365 9
5 86
  5225 16 9686 78 4048 292 0 222 7 28 12 416 1K 621 8
8 84
  2227 17 9459 516 3836 391 0 222 28 117 4 476 1K 651 9
9 82
  3227 16 9478 497 3837 259 0 221 0 30 0 284 1K 496 7
8 85
  3227 16 9480 495 3837 224 0 221 0 1 0 212 971 394 8
6 87
  2228 16 9498 470 3844 247 0 221 0 15 0 240 909 405 8
6 86
  2228 16 9504 462 3846 230 0 221 0 6 0 235 961 418 8
5 87
  5225 16 9588 356 3868 336 0 221 0 110 0 313 908 441 13
6 81

TIA
Kjell Andresen Systems administrator, University of Oslo, Norway
                Center for Information Technology Services and
                Department of Geophysics
Received on Thu Sep 19 1996 - 13:50:24 NZST

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