Significant swap-in and swap-out activity in spite of a lot of free memory
Issue
Significant swap-in and swap-out activity while there is several gigabytes of free memory available.
Notice the following excerpt vmstat:
2014-01-20 04:02:13 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
2014-01-20 04:02:13 r b swpd free buff cache si so bi bo in cs us sy id wa st
2014-01-20 21:05:37 1 0 476328 54108 2448 8756568 0 0 21731 136 2127 6541 1 0 96 3 0
2014-01-20 21:05:57 0 1 476328 53688 2292 8752844 0 0 22492 592 2201 6623 1 0 96 3 0
2014-01-20 21:06:17 0 1 476328 48712 2420 8759916 0 0 9684 820 1957 6485 0 0 96 4 0
2014-01-20 21:06:37 0 1 476328 48740 2404 8760228 0 0 9054 137 1961 6470 0 0 96 4 0
2014-01-20 21:06:57 0 1 476328 50352 2560 8760524 1 0 8503 496 1889 6316 0 0 96 4 0
2014-01-20 21:07:17 1 0 476328 50844 1772 8755260 0 1 91440 915 3051 6803 1 1 96 3 0
2014-01-20 21:07:37 2 0 482108 3628104 1360 5192632 7 20 46243 703 2487 6990 1 5 90 4 0
2014-01-20 21:07:57 2 5 1499572 3951156 1028 4461972 31 15985 1089 17192 2033 6727 1 7 90 2 0
2014-01-20 21:08:17 0 17 1614756 4090840 1252 4383308 264 7302 423 8467 1373 5568 0 1 76 23 0
2014-01-20 21:08:55 0 27 1631652 4178880 1332 4367380 11 3910 32 3930 1134 4885 0 0 65 35 0
2014-01-20 21:08:57 0 29 1634348 4283284 1364 4365220 14 4997 51 5016 1140 4870 0 0 63 37 0
2014-01-20 21:09:17 0 36 1634312 4308844 1396 4365392 21 1591 34 1612 1132 4969 0 0 63 37 0
2014-01-20 21:09:38 0 36 1634304 4329148 1436 4365380 13 863 37 872 1132 4959 0 0 48 52 0
2014-01-20 21:09:58 0 32 1634300 4353208 1456 4365548 13 1147 23 1155 1133 5063 0 0 47 53 0
2014-01-20 21:10:18 0 37 1634296 4371076 1496 4362128 10 845 17 857 1135 5047 0 0 50 50 0
Environment
- Red Hat Enterprise Linux 5.6
- kernel-2.6.18-194.el5
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