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Q: high page scan rate

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David Pugh

unread,
Oct 30, 1997, 3:00:00 AM10/30/97
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Hi,
I have a question regarding my system's memory and if the scan rate I
see from sar -g 30 100 (or from vmstat for that matter)is telling me I
need even more RAM. I am running Lotus Notes server with 2 partitions
and ~2500 users. This machine is basically a big e-mail server. I'm
seeing scan rates well over 200 for extended periods of time. According
to Adrian Cockcroft's Sun Performance and Tuning book, a scan rate of
over 200 is bad and means that I'm short on memory. Can someone give me
some advice before I have to justify buying another gig of memory. I do
not see this when running just 1 Lotus Notes partition.

Configuration:
E4000 with
3G of RAM
2G of swap
Solaris 2.5.1
2 RSM 2000's
VxVM 2.4
shmsys:shminfo_shmmax=268435456
strctlsz=4096
max_nprocs=4096
shmsys_shminfo_shmseg=600
shmsys:shminfo_shmmni=512
shmsys:shminfo_shmmin=1

thanks,
Dave Pugh

Sample sar output is below if interested. Specifically checkout 11:06 -
11:21.

usmail1# sar -g 30 100

SunOS usmail1 5.5.1 Generic 103640-12 sun4u 10/30/97

10:51:40 pgout/s ppgout/s pgfree/s pgscan/s %ufs_ipf
10:52:10 43.12 68.18 160.45 127.86 0
10:52:40 42.94 73.82 170.59 128.58 0
10:53:10 49.53 71.5 167.33 125.2 0
10:53:40 48.6 90.17 188.43 135.6 0
10:54:10 48.28 130.12 219.56 121.59 0
10:54:40 39.17 60.53 148.5 117.67 0
10:55:10 33.83 51.87 129.1 104.7 0
10:55:40 34.36 50.68 123.13 96.8 0
10:56:10 59.5 123.23 587 554.17 0
10:56:40 43.02 65.88 217.56 187.14 0
10:57:10 46.12 68.38 171.51 134.49 0
10:57:40 40.92 59.75 140.22 106.46 0
10:58:10 50.78 76.64 146.38 97.73 0
10:58:40 47.23 72.7 218.43 185.33 0
10:59:10 51.5 79.77 275.37 251.8 0
10:59:40 54.1 104.33 203.56 134.91 0
11:00:10 78.56 284.69 398.87 158.25 0
11:00:40 53.63 81.07 171.03 117 0
11:01:10 50.9 79.67 213.17 170.83 0
11:01:40 41.11 84.44 190.61 133.98 0
11:02:10 39.07 70.53 150.23 105.53 0
11:02:40 47.87 94 187.04 124.65 0
11:03:10 66.2 112.17 202.17 125.1 0
11:03:40 51.42 75.47 163.21 115.53 0
11:04:10 36.69 65.58 187.57 153.02 0
11:04:40 53.25 89.24 248.62 191.07 0
11:05:10 115.43 285.07 369.78 143.12 0
11:05:40 86.2 180.04 256.18 111.13 0
11:06:10 38.95 60.15 193.17 161.51 0
11:06:40 47.43 73.73 300.67 282.67 0
11:07:10 74.24 113.23 376.97 310.06 0
11:07:40 91.04 148.95 545.65 474.68 0
11:08:10 94.6 133.32 369.34 298.2 0
11:08:40 57.51 84.51 267.68 228.16 0
11:09:10 51.33 73 253.53 214.4 0
11:09:40 57.93 90.87 332.98 289.64 0
11:10:10 59.57 91 325.63 278.87 0
11:10:40 46.75 76.04 324.46 292.64 0
11:11:10 57.93 85.77 331.63 290.1 0
11:11:40 47.04 104.36 374.98 316.62 0
11:12:10 127.02 214.96 348.12 239.22 0
11:12:40 147.73 249.6 448.53 320.4 0
11:13:10 127.09 199.27 332.76 234.72 0
11:13:40 131.37 204.13 406.83 334.3 0
11:14:10 60.15 93.34 394.67 474.61 0
11:14:40 68.03 100.93 291.4 261.53 0
11:15:10 50.02 78.47 322.86 296.53 0
11:15:40 59.15 88.7 283.31 251.22 0
11:16:10 123.53 197.97 385.64 297.77 0
11:16:40 68.48 175.84 378.61 272.81 0
11:17:10 86.03 189.17 434.6 334.67 0
11:17:40 64.48 96.5 294.57 247.08 0
11:18:10 70.02 105.24 319.14 276.43 0
11:18:40 59.26 96.74 310.69 276.52 0
11:19:10 47.47 83.9 324.67 311.77 0
11:19:40 63.55 98.83 321.46 284.47 0
11:20:10 68.98 137.85 350.15 260.95 0
11:20:40 62.78 97.1 230.79 185.24 0
11:21:10 65.87 100.53 279.17 228.87 0
11:21:40 44.25 78.64 280.14 240.82 0
11:22:10 48.12 68.81 160.71 119.53 0
11:22:40 30.32 51.65 191.4 172.28 0
11:23:10 60.21 92.16 213.78 168.38 0
11:23:40 56.17 102.53 297.3 234.13 0
11:24:10 59.83 124.87 370.8 301.4 0
11:24:40 57.21 98.57 259.18 203.03 0
11:25:10 39.61 61.29 166.29 132.68 0
11:25:40 64.58 94.3 218.16 175.91 0
11:26:10 38.9 73.6 129.03 73.13 0
11:26:40 60.13 94 204.83 162.33 0
11:27:10 42.65 66.39 224.14 191.86 0
11:27:40 36.98 59.09 178.55 151.5 0
11:28:10 47.47 76.2 187.73 149.2 0
11:28:40 37.35 59.28 152.65 121.69 0
11:29:10 31.82 52.95 129.59 101.4 0
11:29:40 25.78 39.65 176.13 160.45 0
11:30:10 37.93 55.2 124.13 97.07 0
11:30:40 46.07 75.9 261.77 232.9 0
11:31:09 52.03 86.3 269.87 227.1 0
11:31:38 48.83 83.9 243.2 192.27 0
11:32:08 32.13 47.83 133.17 105.23 0
11:32:38 40.41 62.62 147.93 111.23 0
11:33:08 40.21 66.36 183.36 150.52 0
11:33:38 49.92 77.04 227.89 193.47 0
11:34:08 30.07 48.47 110.87 81.47 0
11:34:38 29.41 46.92 130.64 108.6 0
11:35:08 28.57 43.73 135.67 115.17 0
11:35:38 42.84 61.56 133.64 111.43 0
11:36:08 28.96 44.29 114.36 84.91 0
11:36:38 35.12 54.52 132.12 108.13 0
11:37:08 33.86 87.27 169.44 107.86 0
11:37:38 28.39 48.22 118.76 91.87 0
11:38:08 39.33 65.28 192.96 156.17 0
11:38:38 44.07 68.7 188.6 157.23 0
11:39:08 36.65 63.91 156.85 118.43 0
11:39:38 38.67 102.53 200.4 122.17 0
11:40:08 35.28 70.69 164.29 117.95 0
11:40:38 29.64 45.05 158.05 135.91 0
11:41:08 29.67 50.7 142.77 114.33 0
11:41:38 34.69 54.42 171.81 143.69 0

Average 54.03 92.99 240.13 191.31 0

John I-Chung Wang

unread,
Nov 3, 1997, 3:00:00 AM11/3/97
to pug...@lilly.com

Hello David

Correlate it with your disk IO if possible. Starting in Solaris 2.5,
writes don't really write but leave it to the paging system to organize
the writes hence normal writes shows up as page outs. If your
application is doing a lot of writes, the high page out count may be
bogus.

Regards,
John

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