russell@CCU1.AUKUNI.AC.NZ (07/09/90)
We are running a 4D/240s under 3.2.1 and have observed the following phenomenon: When the machine is idle or lightly loaded it displays large % of wio. for example here is a sar output which I did a few minutes ago. ccu1.auk ccu1.auk 3.2.1 10171414 IP7 07/06/90 00:00:07 %usr %sys %intr %wio %idle %sbrk %wfs %wswp %wphy %wgsw %wfif 01:00:01 4 9 0 81 6 0 38 44 18 0 0 02:00:00 1 5 0 56 38 0 3 97 0 0 0 03:00:00 1 5 0 56 38 0 3 97 0 0 0 04:00:01 1 5 0 56 38 0 2 98 0 0 0 05:00:00 2 5 0 56 37 0 4 96 0 0 0 06:00:01 1 5 0 55 39 0 2 98 0 0 0 07:00:00 1 5 0 56 39 0 2 98 0 0 0 08:00:01 1 5 0 56 38 0 4 96 0 0 0 08:20:00 2 6 0 55 36 0 10 90 0 0 0 08:40:01 3 8 0 28 61 0 20 80 0 0 0 09:00:02 4 11 0 42 42 0 28 72 0 0 0 09:20:01 20 12 0 36 32 0 17 83 0 0 0 09:40:03 10 13 2 41 34 0 23 77 0 0 0 10:00:03 19 16 1 42 21 0 31 53 16 0 0 10:20:01 10 15 1 70 3 0 48 41 11 0 0 10:40:05 31 18 2 42 6 0 44 42 14 0 0 11:00:04 21 18 1 54 5 0 54 46 0 0 0 11:00:04 %usr %sys %intr %wio %idle %sbrk %wfs %wswp %wphy %wgsw %wfif Average 5 7 0 55 32 0 19 76 5 0 0 Notice the drop between 8:20 and 8:40. This coincides with cleaning up logins that have been left over from the previous day. This seems significant. We have asked the local SGI agents about this and they have not come up with any explanation. Any ideas? We are not certain if this is a problem or not. We have observed that poor performance during the day is also linked with high wio figures but are wondering if these are as spurious as the overnight ones. Thanks, Russell.