我正在使用带有64 GB RAM的WiredTiger运行MongoDB 3.4实例。最近，我经常遇到内存不足的情况，这需要重新启动数据库。
以下是mongostat中虚拟内存的增加。突然之间，虚拟内存增加了，服务器崩溃了。我试图浏览日志以查找问题，但尚未确定似乎在虚拟内存增加和崩溃之前的唯一查询或操作。
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn set repl time
*0 34 *0 *0 5 85|0 0.0 80.1 1 61.5G 59.5G 0|0 5|0 13.2k 5.09m 279 server PRI 2019-09-23T14:20:36-04:00
1 11 *0 *0 3 43|0 0.0 80.0 0 61.5G 60.1G 0|0 5|0 7.65k 223k 279 server PRI 2019-09-23T14:20:37-04:00
*0 5 *0 *0 0 46|0 0.0 80.1 0 61.9G 60.8G 0|0 5|0 4.03k 161k 279 server PRI 2019-09-23T14:20:38-04:00
*0 10 *0 *0 0 39|0 0.0 80.1 0 62.7G 61.5G 0|0 5|0 3.64k 128k 279 server PRI 2019-09-23T14:20:39-04:00
*0 18 *0 *0 0 51|0 0.0 80.0 0 63.0G 61.9G 0|0 24|0 5.85k 33.2k 279 server PRI 2019-09-23T14:20:41-04:00
*0 *0 *0 *0 0 25|0 0.0 80.0 0 63.0G 61.9G 0|0 6|0 2.10k 109k 279 server PRI 2019-09-23T14:20:43-04:00
*0 8 *0 *0 0 28|0 0.0 80.0 0 63.0G 61.9G 0|0 7|0 2.87k 118k 279 server PRI 2019-09-23T14:20:45-04:00
*0 32 *0 *0 2 98|0 0.0 80.3 0 63.2G 61.9G 0|0 6|0 11.6k 366k 279 server PRI 2019-09-23T14:20:46-04:00
*0 *0 *0 *0 1 18|0 0.0 80.2 0 63.4G 61.8G 0|0 5|0 1.93k 4.34m 279 server PRI 2019-09-23T14:20:47-04:00
*0 8 *0 *0 0 61|0 0.0 80.3 0 63.4G 61.8G 0|0 5|0 4.57k 325k 279 server PRI 2019-09-23T14:20:48-04:00
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn set repl time
1 18 2 *0 3 40|0 0.0 80.4 0 63.6G 61.8G 0|0 6|0 22.5k 219k 279 server PRI 2019-09-23T14:20:49-04:00
*0 21 *0 *0 2 29|0 0.0 80.4 0 63.7G 61.8G 0|0 6|0 5.67k 573k 279 server PRI 2019-09-23T14:20:50-04:00
*0 17 *0 *0 0 45|0 0.0 80.2 0 63.8G 61.8G 0|0 5|0 5.53k 4.06m 279 server PRI 2019-09-23T14:20:51-04:00
1 8 1 *0 4 23|0 0.0 80.2 0 63.9G 61.8G 0|0 5|0 87.7k 341k 279 server PRI 2019-09-23T14:20:52-04:00
1 23 *0 *0 4 44|0 0.0 80.3 0 64.1G 61.8G 0|0 6|0 10.2k 4.56m 279 server PRI 2019-09-23T14:20:53-04:00
*0 *0 *0 *0 0 8|0 0.0 80.4 0 64.2G 61.8G 0|0 5|0 569b 122k 279 server PRI 2019-09-23T14:20:54-04:00
*0 12 *0 *0 0 30|0 0.0 80.2 0 64.3G 61.8G 0|0 5|0 3.61k 92.2k 279 server PRI 2019-09-23T14:20:55-04:00
*0 7 *0 *0 0 62|0 0.0 80.2 0 64.4G 61.8G 0|0 5|0 4.69k 113k 279 server PRI 2019-09-23T14:20:56-04:00
*0 1 *0 *0 0 29|0 0.0 80.2 0 64.5G 61.8G 0|0 5|0 2.59k 91.3k 279 server PRI 2019-09-23T14:20:58-04:00
*0 2 *0 *0 1 54|0 0.0 80.0 0 64.7G 61.7G 0|0 5|0 3.89k 104k 279 server PRI 2019-09-23T14:20:59-04:00
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn server repl time
*0 2 *0 *0 0 25|0 0.0 80.2 0 64.8G 61.7G 0|0 7|0 2.10k 86.5k 279 server PRI 2019-09-23T14:21:00-04:00
1 40 1 *0 0 69|0 0.0 80.4 0 65.0G 61.8G 0|0 7|2 14.5k 174k 279 server PRI 2019-09-23T14:21:01-04:00
*0 1 *0 *0 3 14|0 0.0 80.6 0 65.1G 61.8G 0|0 6|0 2.89k 80.5k 279 server PRI 2019-09-23T14:21:02-04:00
*0 2 *0 *0 0 18|0 0.0 80.8 0 65.2G 61.8G 0|0 6|0 1.51k 87.8k 279 server PRI 2019-09-23T14:21:03-04:00
*0 2 *0 *0 0 8|0 0.0 80.9 0 65.4G 61.8G 0|0 6|0 811b 126k 279 server PRI 2019-09-23T14:21:04-04:00
*0 16 *0 *0 0 45|0 0.0 80.9 0 65.5G 61.8G 0|0 6|0 5.02k 105k 279 server PRI 2019-09-23T14:21:06-04:00
*0 4 *0 *0 0 49|0 0.0 80.9 0 65.6G 61.8G 0|0 6|0 3.70k 101k 279 server PRI 2019-09-23T14:21:07-04:00
*0 4 *0 *0 1 51|0 0.0 80.9 0 65.8G 61.8G 0|0 6|0 4.52k 388k 279 server PRI 2019-09-23T14:21:08-04:00
*0 2 1 *0 2 33|0 0.0 81.0 0 65.9G 61.8G 0|0 6|0 84.9k 256k 279 server PRI 2019-09-23T14:21:09-04:00
*0 *0 *0 *0 0 20|0 0.0 81.0 0 66.0G 61.8G 0|0 6|0 1.32k 82.3k 279 server PRI 2019-09-23T14:21:10-04:00
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn set repl time
*0 21 *0 *0 0 41|0 0.0 81.0 0 66.1G 61.8G 0|0 6|0 5.66k 106k 279 server PRI 2019-09-23T14:21:11-04:00
*0 *0 *0 *0 0 11|0 0.0 81.1 0 66.3G 61.8G 0|0 6|0 818b 77.0k 279 server PRI 2019-09-23T14:21:12-04:00
*0 *0 *0 *0 0 18|0 0.0 81.1 0 66.4G 61.8G 0|0 6|0 1.21k 81.5k 279 server PRI 2019-09-23T14:21:13-04:00
*0 *0 *0 *0 1 15|0 0.0 81.0 0 66.5G 61.7G 0|0 6|0 2.05k 77.0k 279 server PRI 2019-09-23T14:21:14-04:00
*0 1 *0 *0 0 29|0 0.0 80.9 0 66.6G 61.8G 0|0 6|0 1.89k 87.6k 279 server PRI 2019-09-23T14:21:15-04:00
*0 20 *0 *0 0 72|0 0.0 80.9 0 66.8G 61.8G 0|0 6|0 7.59k 173k 279 server PRI 2019-09-23T14:21:16-04:00
4 5 *0 *0 6 38|0 0.0 80.8 0 66.8G 61.6G 0|0 6|0 20.2k 119k 279 server PRI 2019-09-23T14:21:17-04:00
*0 *0 *0 *0 0 42|0 0.0 81.0 0 67.0G 61.7G 0|0 6|0 2.45k 96.6k 279 server PRI 2019-09-23T14:21:18-04:00
*0 *0 *0 *0 0 17|0 0.0 80.9 0 67.1G 61.7G 0|0 6|0 1.15k 80.6k 279 server PRI 2019-09-23T14:21:20-04:00
*0 15 *0 *0 0 13|0 0.0 80.1 0 67.2G 61.7G 0|0 6|0 3.01k 83.2k 279 server PRI 2019-09-23T14:21:21-04:00
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn set repl time
*0 3 *0 *0 0 42|0 0.0 80.0 0 67.2G 61.7G 0|0 6|0 3.16k 96.3k 279 server PRI 2019-09-23T14:21:22-04:00
*0 *0 *0 *0 1 20|0 0.0 80.2 0 67.5G 61.8G 0|0 6|0 2.13k 81.7k 279 server PRI 2019-09-23T14:21:23-04:00
*0 2 1 *0 0 13|0 0.0 80.2 0 67.6G 61.8G 0|0 6|1 58.9k 90.9k 279 server PRI 2019-09-23T14:21:24-04:00
*0 1 *0 *0 2 29|0 0.0 80.3 0 67.7G 61.8G 0|0 6|0 3.74k 249k 279 server PRI 2019-09-23T14:21:25-04:00
3 29 2 *0 7 90|0 0.0 80.2 0 67.8G 61.7G 0|0 8|0 49.8k 494k 279 server PRI 2019-09-23T14:21:26-04:00
3 10 1 *0 12 40|0 0.0 80.2 0 68.0G 61.8G 0|0 8|0 18.2k 1.36m 279 server PRI 2019-09-23T14:21:27-04:00
*0 2 *0 *0 0 54|0 0.0 80.4 0 68.1G 61.7G 0|0 8|0 3.42k 308k 279 server PRI 2019-09-23T14:21:28-04:00
*0 *0 *0 *0 0 24|0 0.0 80.6 0 68.2G 61.7G 0|0 9|0 1.84k 81.0k 279 server PRI 2019-09-23T14:21:29-04:00
*0 12 *0 *0 0 20|0 0.0 80.8 0 68.4G 61.8G 0|0 9|0 3.26k 107k 279 server PRI 2019-09-23T14:21:30-04:00
*0 7 *0 *0 0 47|0 0.0 81.0 0 68.5G 61.7G 0|0 8|0 4.26k 128k 279 server PRI 2019-09-23T14:21:32-04:00
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn set repl time
*0 *0 *0 *0 1 15|0 0.0 81.2 0 68.6G 61.7G 0|0 8|0 1.77k 79.8k 279 server PRI 2019-09-23T14:21:33-04:00
*0 *0 *0 *0 0 15|0 0.0 81.4 0 68.7G 61.7G 0|0 8|0 1.07k 78.2k 279 server PRI 2019-09-23T14:21:34-04:00
*0 *0 *0 *0 0 8|0 0.0 81.6 0 68.9G 61.7G 0|0 6|0 545b 5.90m 279 server PRI 2019-09-23T14:21:35-04:00
*0 22 *0 *0 0 64|0 0.0 81.8 1 69.0G 61.7G 0|0 8|0 7.73k 120k 279 server PRI 2019-09-23T14:21:36-04:00
*0 1 *0 *0 1 39|0 0.0 81.9 0 69.1G 61.7G 0|0 8|0 3.59k 95.0k 279 server PRI 2019-09-23T14:21:37-04:00
*0 1 *0 *0 0 46|0 0.0 82.1 0 69.3G 61.8G 0|0 8|0 3.12k 201k 279 server PRI 2019-09-23T14:21:38-04:00
*0 2 *0 *0 0 22|0 0.0 82.2 0 69.4G 61.8G 0|0 8|0 2.09k 86.7k 279 server PRI 2019-09-23T14:21:39-04:00
*0 13 *0 *0 0 18|0 0.0 82.3 0 69.5G 61.8G 0|0 7|0 3.03k 135k 279 server PRI 2019-09-23T14:21:40-04:00
*0 7 *0 *0 0 51|0 0.0 82.5 0 69.7G 61.8G 0|0 7|0 4.56k 107k 280 server PRI 2019-09-23T14:21:42-04:00
*0 *0 *0 *0 1 18|0 0.0 82.5 0 69.7G 61.6G 0|0 7|0 2.25k 81.0k 279 server PRI 2019-09-23T14:21:43-04:00
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn set repl time
*0 5 *0 *0 0 28|0 0.0 82.7 0 69.9G 61.7G 0|0 9|0 2.78k 157k 279 server PRI 2019-09-23T14:21:44-04:00
*0 21 *0 *0 1 48|0 0.0 82.9 0 70.1G 61.8G 0|0 9|0 7.43k 230k 280 server PRI 2019-09-23T14:21:45-04:00
*0 8 *0 *0 2 71|0 0.0 83.0 0 70.2G 61.7G 0|0 9|0 7.69k 164k 280 server PRI 2019-09-23T14:21:47-04:00
*0 2 *0 *0 1 27|0 0.0 83.2 0 70.4G 61.8G 0|0 9|0 2.13k 580k 280 server PRI 2019-09-23T14:21:48-04:00
*0 *0 *0 *0 0 42|0 0.0 83.3 0 70.6G 61.8G 0|0 9|0 2.43k 102k 280 server PRI 2019-09-23T14:21:49-04:00
*0 *0 *0 *0 0 16|0 0.0 83.2 0 70.6G 61.8G 0|0 8|0 1.09k 4.04m 280 server PRI 2019-09-23T14:21:50-04:00
1 23 *0 *0 0 29|0 0.0 83.3 0 70.8G 61.8G 0|0 9|1 6.38k 101k 281 server PRI 2019-09-23T14:21:51-04:00
EOF
no reachable servers
我还看到虚拟内存增加，有时不会导致崩溃。但是，虚拟内存增加之后不会减少，而是保持其较高的值。
*0 97 *0 *0 10 62|0 0.0 80.1 0 49.1G 47.0G 0|0 3|0 29.2k 1.05m 281 server PRI 2019-09-24T11:43:35-04:00
*0 56 *0 *0 2 17|0 0.0 80.2 0 49.3G 48.0G 0|0 3|0 14.7k 1.31m 281 server PRI 2019-09-24T11:43:36-04:00
*0 94 *0 *0 5 20|0 0.0 80.1 0 50.1G 48.8G 0|0 3|0 26.6k 872k 281 server PRI 2019-09-24T11:43:37-04:00
*0 46 *0 *0 8 30|0 0.0 80.1 0 50.4G 49.1G 0|0 4|0 14.8k 738k 281 server PRI 2019-09-24T11:43:38-04:00
*0 61 *0 *0 6 36|0 0.0 80.2 0 50.8G 49.6G 0|0 3|0 20.1k 1.53m 281 server PRI 2019-09-24T11:43:39-04:00
*0 74 *0 *0 1 34|0 0.0 80.0 0 51.2G 49.9G 0|0 3|0 19.5k 621k 281 server PRI 2019-09-24T11:43:40-04:00
*0 145 *0 *0 5 33|0 0.0 80.0 0 51.5G 50.3G 0|0 3|0 40.6k 2.31m 281 server PRI 2019-09-24T11:43:41-04:00
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn set repl time
*0 30 *0 *0 10 23|0 0.0 80.1 0 51.9G 50.6G 0|0 4|0 10.3k 821k 281 server PRI 2019-09-24T11:43:42-04:00
*0 66 *0 *0 12 6|0 0.0 80.0 0 52.4G 51.1G 0|0 3|0 19.0k 1.03m 281 server PRI 2019-09-24T11:43:43-04:00
*0 62 *0 *0 11 19|0 0.0 80.2 0 52.8G 51.6G 0|0 3|0 19.1k 1.09m 281 server PRI 2019-09-24T11:43:45-04:00
*0 58 *0 *0 9 47|0 0.0 80.2 0 53.5G 52.2G 0|0 3|0 17.9k 1.57m 281 server PRI 2019-09-24T11:43:46-04:00
3 139 3 *0 10 38|0 0.0 80.2 0 54.2G 52.9G 0|0 3|0 103k 876k 281 server PRI 2019-09-24T11:43:47-04:00
*0 79 *0 *0 4 20|0 0.0 80.4 0 54.9G 53.5G 0|0 4|0 23.1k 2.25m 281 server PRI 2019-09-24T11:43:48-04:00
*0 46 *0 *0 6 25|0 0.0 80.2 0 55.3G 54.0G 0|0 4|0 14.2k 4.06m 281 server PRI 2019-09-24T11:43:49-04:00
*0 58 *0 *0 6 49|0 0.0 80.3 0 55.7G 54.4G 0|0 3|0 18.4k 902k 281 server PRI 2019-09-24T11:43:50-04:00
*0 82 *0 *0 10 34|0 0.0 80.0 0 56.3G 55.0G 0|0 3|0 22.5k 997k 281 server PRI 2019-09-24T11:43:51-04:00
*0 43 *0 *0 7 35|0 0.0 80.0 0 56.7G 55.4G 0|0 3|0 15.5k 2.27m 281 server PRI 2019-09-24T11:43:52-04:00
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn set repl time
*0 54 *0 *0 6 25|0 0.0 80.1 0 57.1G 55.8G 0|0 3|0 17.1k 6.94m 281 server PRI 2019-09-24T11:43:53-04:00
*0 72 *0 *0 4 9|0 0.0 80.2 0 57.6G 56.3G 0|0 4|0 19.6k 808k 281 server PRI 2019-09-24T11:43:54-04:00
*0 64 *0 *0 9 62|0 0.0 80.2 0 58.0G 56.7G 0|0 4|0 21.4k 975k 281 server PRI 2019-09-24T11:43:55-04:00
*0 43 *0 *0 5 17|0 0.0 80.2 0 58.5G 57.2G 0|0 3|0 11.4k 2.94m 281 server PRI 2019-09-24T11:43:56-04:00
*0 75 *0 *0 7 18|0 0.0 80.1 0 58.9G 57.6G 0|0 3|0 23.5k 1.44m 281 server PRI 2019-09-24T11:43:57-04:00
*0 128 *0 *0 7 26|0 0.0 80.2 0 59.5G 58.2G 0|0 3|0 37.6k 1.44m 281 server PRI 2019-09-24T11:43:58-04:00
*0 64 *0 *0 1 37|0 0.0 79.8 0 59.9G 58.6G 0|0 3|0 18.0k 1.01m 281 server PRI 2019-09-24T11:43:59-04:00
1 83 *0 *0 7 47|0 0.0 80.0 0 60.4G 59.1G 0|0 4|0 27.5k 4.80m 281 server PRI 2019-09-24T11:44:00-04:00
*0 75 *0 *0 6 42|0 0.0 80.0 1 60.7G 59.4G 0|0 4|0 21.7k 835k 281 server PRI 2019-09-24T11:44:01-04:00
*0 31 *0 *0 8 19|0 0.0 80.1 0 61.1G 59.8G 0|0 3|0 10.7k 1.66m 281 server PRI 2019-09-24T11:44:02-04:00
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn set repl time
*0 26 *0 *0 4 13|0 0.0 80.1 0 61.3G 60.0G 0|0 4|0 8.07k 341k 281 server PRI 2019-09-24T11:44:03-04:00
*0 42 *0 *0 4 17|0 0.0 80.0 0 61.5G 60.3G 0|0 4|0 12.3k 467k 281 server PRI 2019-09-24T11:44:04-04:00
1 59 *0 *0 7 55|0 0.0 80.0 0 61.9G 60.6G 0|0 5|0 20.7k 1.30m 281 server PRI 2019-09-24T11:44:05-04:00
*0 43 *0 *0 6 25|0 0.0 80.0 0 62.5G 61.1G 0|0 4|0 12.4k 3.48m 281 server PRI 2019-09-24T11:44:06-04:00
*0 52 *0 *0 10 24|0 0.0 80.0 0 62.8G 61.4G 0|0 3|0 16.1k 1.56m 281 server PRI 2019-09-24T11:44:07-04:00
*0 29 *0 *0 4 32|0 0.0 80.0 0 62.8G 61.4G 0|0 3|0 10.9k 1.35m 281 server PRI 2019-09-24T11:44:09-04:00
*0 44 *0 *0 7 36|0 0.0 80.0 0 62.8G 61.4G 0|0 4|0 14.2k 776k 281 server PRI 2019-09-24T11:44:10-04:00
*0 135 *0 *0 4 38|0 0.0 80.0 0 62.8G 61.4G 0|0 3|0 36.2k 824k 281 server PRI 2019-09-24T11:44:11-04:00
*0 36 *0 *0 1 33|0 0.0 80.0 0 62.8G 61.4G 0|0 4|0 12.3k 1.33m 281 server PRI 2019-09-24T11:44:12-04:00
*0 54 *0 *0 7 19|0 0.0 80.0 0 62.8G 61.4G 0|0 2|0 15.9k 737k 279 server PRI 2019-09-24T11:44:13-04:00
insert query update delete getmore command % dirty % used flushes vsize res qr|qw ar|aw netIn netOut conn set repl time
*0 60 *0 *0 4 7|0 0.0 80.0 0 62.8G 61.4G 0|0 2|0 16.5k 798k 279 server PRI 2019-09-24T11:44:14-04:00
*0 72 *0 *0 4 39|0 0.0 80.0 0 62.8G 61.4G 0|0 1|0 21.3k 835k 279 server PRI 2019-09-24T11:44:15-04:00
*0 47 *0 *0 5 31|0 0.0 80.0 0 62.8G 61.4G 0|0 2|0 14.1k 1.28m 279 server PRI 2019-09-24T11:44:16-04:00
*0 68 *0 *0 3 14|0 0.0 80.0 0 62.8G 61.4G 0|0 1|0 19.0k 851k 279 server PRI 2019-09-24T11:44:17-04:00
*0 52 *0 *0 7 20|0 0.0 80.0 0 62.8G 61.4G 0|0 2|0 15.4k 993k 279 server PRI 2019-09-24T11:44:18-04:00
*0 59 *0 *0 6 21|0 0.0 80.0 0 62.8G 61.4G 0|0 1|0 19.5k 1.23m 279 server PRI 2019-09-24T11:44:19-04:00
*0 61 *0 *0 4 55|0 0.0 80.0 0 62.8G 61.4G 0|0 1|0 19.4k 839k 279 server PRI 2019-09-24T11:44:20-04:00
*0 334 *0 *0 0 21|0 0.0 80.0 0 62.8G 61.4G 0|0 1|0 86.4k 727k 279 server PRI 2019-09-24T11:44:21-04:00
*0 25 *0 *0 2 28|0 0.0 80.1 0 62.8G 61.4G 0|0 1|0 9.11k 1.43m 279 server PRI 2019-09-24T11:44:22-04:00
*0 48 *0 *0 8 20|0 0.0 79.9 0 62.8G 61.4G 0|0 1|0 15.6k 707k 279 server PRI 2019-09-24T11:44:23-04:00
诊断这些虚拟内存增加的原因的最佳实践是什么？虚拟内存如何增加而不随后减少？是什么原因造成的？我应该在原木和其他地方寻找什么？