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Type:
Bug
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Resolution: Done
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Priority:
Minor - P4
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None
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Affects Version/s: None
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Component/s: WiredTiger
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ALL
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0
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Original summary
iowait, softirq and ssytem CPU usage drastically changed from upgrading MongoDB 3.0 to 3.2
Original description
Hello,
Last night I upgraded my MongoDB 3.0.9 to 3.2 in a rolling upgrade and it went ok. But I have noticed the CPU usage both on the machines and MMS that some parameters have changed drastically. It is noticeable from 2 screenshots I attached (before upgrade and after)
It is also noticeable when I am SSH to the machine every 20-30 seconds it freezes for a sec or two.
Details:
Machines:
2x VM Ubuntu 14.0.4 LTS
80GB RAM and 10 core of CPU
Running replica:
mongod --storageEngine wiredTiger --dbpath /data/ --replSet rs0 --fork --logpath /data/fork.log
MongoDB shell version: 3.2.3
rs0:PRIMARY> db.stats()
{
"db" : "test",
"collections" : 77,
"objects" : 3766991607,
"avgObjSize" : 782.8079483321238,
"dataSize" : 2948830971260,
"storageSize" : 1500816666624,
"numExtents" : 0,
"indexes" : 205,
"indexSize" : 49011482624,
"ok" : 1
}
Some mongostat --discover
localhost:27017 *149 3 *21 *0 0 13|0 0.5 21.9 0 11.1G 10.4G 0|0 0|1 2k 130k 102 rs0 SEC 2016-03-02T12:42:10+01:00
mongodb-replica1:27017 182 *0 23 *0 134 84|0 0.4 21.3 0 10.8G 10.0G 0|0 0|0 289k 323k 112 rs0 PRI 2016-03-02T12:42:11+01:00
mongodb-replica2:27017 *149 3 *21 *0 0 13|0 0.5 21.9 0 11.1G 10.4G 0|0 0|0 2k 130k 102 rs0 SEC 2016-03-02T12:42:10+01:00
localhost:27017 *98 6 *22 *0 0 12|0 0.5 21.9 0 11.1G 10.4G 0|0 0|0 2k 235k 102 rs0 SEC 2016-03-02T12:42:11+01:00
mongodb-replica1:27017 94 *0 36 *0 129 77|0 0.4 21.3 0 10.8G 10.0G 0|0 0|0 189k 200k 112 rs0 PRI 2016-03-02T12:42:12+01:00
mongodb-replica2:27017 *98 6 *22 *0 0 11|0 0.5 21.9 0 11.1G 10.4G 0|0 0|0 2k 217k 102 rs0 SEC 2016-03-02T12:42:11+01:00
localhost:27017 *78 10 *30 *0 0 3|0 0.5 21.9 0 11.1G 10.4G 0|0 0|0 3k 376k 102 rs0 SEC 2016-03-02T12:42:12+01:00
mongodb-replica1:27017 72 *0 31 *0 113 64|0 0.5 21.3 0 10.8G 10.0G 1|0 0|0 153k 163k 112 rs0 PRI 2016-03-02T12:42:13+01:00
mongodb-replica2:27017 *78 10 *30 *0 0 3|0 0.5 21.9 0 11.1G 10.4G 0|0 0|0 3k 376k 102 rs0 SEC 2016-03-02T12:42:12+01:00
localhost:27017 *76 6 *24 *0 0 5|0 0.5 21.9 0 11.1G 10.4G 0|0 0|0 2k 215k 102 rs0 SEC 2016-03-02T12:42:13+01:00
mongodb-replica1:27017 69 *0 4 *0 93 44|0 0.5 21.3 0 10.8G 10.0G 0|0 0|1 98k 115k 112 rs0 PRI 2016-03-02T12:42:14+01:00
mongodb-replica2:27017 *75 6 *24 *0 0 5|0 0.5 21.9 0 11.1G 10.4G 0|1 0|0 2k 215k 102 rs0 SEC 2016-03-02T12:42:13+01:00
localhost:27017 *79 3 *4 *0 0 3|0 0.5 21.9 0 11.1G 10.4G 0|0 0|0 900b 107k 102 rs0 SEC 2016-03-02T12:42:14+01:00
mongodb-replica1:27017 73 *0 17 *0 102 52|0 0.5 21.3 0 10.8G 10.0G 0|0 0|0 136k 149k 112 rs0 PRI 2016-03-02T12:42:15+01:00
mongodb-replica2:27017 *80 3 *4 *0 0 4|0 0.5 21.9 0 11.1G 10.4G 0|0 0|0 979b 126k 102 rs0 SEC 2016-03-02T12:42:14+01:00
localhost:27017 *69 6 *24 *0 0 7|0 0.5 21.9 0 11.1G 10.4G 0|0 0|0 2k 215k 102 rs0 SEC 2016-03-02T12:42:15+01:00
mongodb-replica1:27017 76 *0 18 *0 107 59|0 0.5 21.3 0 10.8G 10.0G 0|0 0|0 133k 667k 112 rs0 PRI 2016-03-02T12:42:16+01:00
mongodb-replica2:27017 *69 6 *24 *0 0 8|0 0.5 21.9 0 11.1G 10.4G 0|0 0|0 2k 215k 102 rs0 SEC 2016-03-02T12:42:15+01:00
localhost:27017 *80 6 *11 *0 0 13|0 0.5 22.0 0 11.1G 10.4G 0|0 0|0 2k 552k 102 rs0 SEC 2016-03-02T12:42:16+01:00
mongodb-replica1:27017 76 *0 18 *0 107 59|0 0.5 21.3 0 10.8G 10.0G 0|0 0|0 133k 667k 112 rs0 PRI 2016-03-02T12:42:16+01:00
mongodb-replica2:27017 *80 6 *11 *0 0 12|0 0.0 22.0 0 11.1G 10.4G 0|0 0|0 2k 552k 102 rs0 SEC 2016-03-02T12:42:16+01:00
localhost:27017 *84 3 *16 *0 0 5|0 0.5 22.0 0 11.1G 10.4G 0|0 0|0 1k 145k 102 rs0 SEC 2016-03-02T12:42:17+01:00
mongodb-replica1:27017 84 *0 14 *0 101 54|0 0.5 21.3 0 10.8G 10.0G 0|0 0|0 140k 154k 112 rs0 PRI 2016-03-02T12:42:17+01:00
mongodb-replica2:27017 *84 3 *16 *0 0 4|0 0.5 22.0 0 11.1G 10.4G 0|0 0|0 989b 127k 102 rs0 SEC 2016-03-02T12:42:17+01:00
localhost:27017 *11 5 *7 *0 0 3|0 0.5 22.0 1 11.1G 10.4G 0|1 4|0 243b 19k 102 rs0 SEC 2016-03-02T12:42:19+01:00
mongodb-replica1:27017 124 *0 29 *0 35 16|0 0.5 21.3 0 10.8G 10.0G 0|0 0|0 168k 113k 112 rs0 PRI 2016-03-02T12:42:19+01:00
mongodb-replica2:27017 *11 5 *7 *0 0 4|0 0.5 22.0 1 11.1G 10.4G 0|1 4|0 322b 37k 102 rs0 SEC 2016-03-02T12:42:19+01:00
localhost:27017 *184 10 *37 *0 0 4|0 0.4 22.0 0 11.1G 10.4G 0|0 0|0 4k 480k 102 rs0 SEC 2016-03-02T12:42:20+01:00
mongodb-replica1:27017 92 *0 17 *0 100 45|0 0.5 21.3 0 10.8G 10.0G 0|0 0|0 135k 229k 112 rs0 PRI 2016-03-02T12:42:20+01:00
mongodb-replica2:27017 *184 10 *37 *0 0 5|0 0.4 22.0 0 11.1G 10.4G 0|0 0|0 4k 480k 102 rs0 SEC 2016-03-02T12:42:20+01:00
Please let me know if you need more info.
Best,
Maziyar
