-
Type:
Bug
-
Resolution: Duplicate
-
Priority:
Major - P3
-
None
-
Affects Version/s: 2.8.0-rc0
-
Component/s: Storage
-
Fully Compatible
-
ALL
Comparing MMAP to WiredTiger on an 8 core server with 32GB Ram and local SSD (AWS Instance).
Throwing a mix of insert/update/query at the server and wiredtiger viewed in mongostat shows really inconsistent performance - also many operations in log are poking about the 100ms mark with inserts taking >1s in some cases. I dont see this inconsistency with mmap v1.
mmapv1 engine output from mongostat looks like this.
insert query update delete getmore command flushes mapped vsize res faults locked db idx miss % qr|qw ar|aw netIn netOut conn time 3076 8761 5582 *0 0 2|0 0 6.0g 12.5g 415.0m 0 :0.0% 0 37|85 42|86 10m 9m 129 15:33:16 2789 10304 5979 *0 0 1|0 0 6.0g 12.5g 418.0m 0 :0.0% 0 42|82 44|83 11m 11m 129 15:33:17 3668 8509 4778 *0 0 1|0 0 6.0g 12.5g 412.0m 0 :0.0% 0 10|65 39|67 10m 9m 129 15:33:18 4151 8757 5172 *0 0 1|0 0 6.0g 12.5g 472.0m 0 :0.0% 0 29|94 32|95 11m 9m 129 15:33:19 3019 7988 6096 *0 0 1|0 0 6.0g 12.5g 477.0m 0 :0.0% 0 44|78 48|79 11m 9m 129 15:33:20 3661 7152 5647 *0 0 2|0 0 6.0g 12.5g 478.0m 0 :0.0% 0 53|75 56|75 11m 8m 129 15:33:21 2378 7132 6574 *0 0 1|0 0 6.0g 12.5g 479.0m 0 :0.0% 0 32|91 35|92 11m 8m 129 15:33:22 2437 8355 6379 *0 0 1|0 0 6.0g 12.5g 484.0m 0 :0.0% 0 41|83 43|84 11m 9m 129 15:33:23 2334 8889 5756 *0 0 1|0 0 6.0g 12.5g 483.0m 0 :0.0% 0 52|72 54|73 10m 9m 129 15:33:24
WT looks like this
insert query update delete getmore command flushes mapped vsize res faults locked db idx miss % qr|qw ar|aw netIn netOut conn time
2348 8786 5922 *0 0 2|0 n/a n/a n/a n/a n/a n/a n/a n/a n/a 10m 9m 129 15:35:48
9918 30670 21542 *0 0 1|0 n/a n/a n/a n/a n/a n/a n/a n/a n/a 39m 34m 129 15:35:49
11902 33152 20733 *0 0 1|0 n/a n/a n/a n/a n/a n/a n/a n/a n/a 41m 37m 129 15:35:50
3801 8540 5223 *0 0 1|0 n/a n/a n/a n/a n/a n/a n/a n/a n/a 11m 9m 129 15:35:51
*0 *0 *0 *0 0 1|0 n/a n/a n/a n/a n/a n/a n/a n/a n/a 79b 13k 129 15:35:52
2934 7013 5251 *0 0 2|0 n/a n/a n/a n/a n/a n/a n/a n/a n/a 10m 8m 129 15:35:53
548 1183 896 *0 0 1|0 n/a n/a n/a n/a n/a n/a n/a n/a n/a 1m 1m 129 15:35:54
52 91 77 *0 0 1|0 n/a n/a n/a n/a n/a n/a n/a n/a n/a 159k 118k 129 15:35:55
5622 14617 12105 *0 0 1|0 n/a n/a n/a n/a n/a n/a n/a n/a n/a 22m 16m 129 15:35:56
- is duplicated by
-
-
- Closed
-
-
-
- Closed
-
-
-
- Closed
-
- is related to
-
-
- Closed
-
- related to
-
SERVER-16572 Add counter for calls to sched_yield in WiredTiger
-
- Closed
-
-
-
- Closed
-
-
-
- Closed
-