MXFileStore: Aggregate commit operations about matrix-ios-sdk

[manuroe]

An example of that.
Task 82 corresponds to the storage of an initial /sync.
Once it completes, we can see the long list of pending commits that are then processed.

2017-03-17 09:31:45.187880 Riot[5387:2383385] [MXFileStore commit] Background task #82 is complete - lasted 11652ms
2017-03-17 09:31:45.196171 Riot[5387:2383892] [MXFileStore commit] lasted 8ms for 1 rooms state
2017-03-17 09:31:45.234517 Riot[5387:2383892] [MXFileStore] saveUsers in 38ms
2017-03-17 09:31:45.242698 Riot[5387:2383892] [MXFileStore commit] lasted 8ms for metadata
2017-03-17 09:31:45.246193 Riot[5387:2383385] [MXFileStore commit] Background task #88 is complete - lasted 10242ms
2017-03-17 09:31:45.263242 Riot[5387:2383892] [MXFileStore commit] lasted 17ms for 1 rooms
2017-03-17 09:31:45.265648 Riot[5387:2383385] [MXFileStore commit] Background task #89 is complete - lasted 10162ms
2017-03-17 09:31:45.281173 Riot[5387:2383892] [MXFileStore commit] lasted 16ms for 1 rooms
2017-03-17 09:31:45.283708 Riot[5387:2383385] [MXFileStore commit] Background task #90 is complete - lasted 10133ms
2017-03-17 09:31:45.299434 Riot[5387:2383892] [MXFileStore commit] lasted 16ms for 1 rooms
2017-03-17 09:31:45.301890 Riot[5387:2383385] [MXFileStore commit] Background task #91 is complete - lasted 9976ms
2017-03-17 09:31:45.316696 Riot[5387:2383892] [MXFileStore commit] lasted 15ms for 1 rooms
2017-03-17 09:31:45.318982 Riot[5387:2383385] [MXFileStore commit] Background task #92 is complete - lasted 9981ms
2017-03-17 09:31:45.334566 Riot[5387:2383892] [MXFileStore commit] lasted 16ms for 1 rooms
2017-03-17 09:31:45.336922 Riot[5387:2383385] [MXFileStore commit] Background task #93 is complete - lasted 9957ms
2017-03-17 09:31:45.350110 Riot[5387:2383892] [MXFileStore commit] lasted 13ms for 1 rooms
2017-03-17 09:31:45.352410 Riot[5387:2383385] [MXFileStore commit] Background task #94 is complete - lasted 9788ms
2017-03-17 09:31:45.365573 Riot[5387:2383892] [MXFileStore commit] lasted 13ms for 1 rooms
2017-03-17 09:31:45.367902 Riot[5387:2383385] [MXFileStore commit] Background task #95 is complete - lasted 9786ms
2017-03-17 09:31:45.380992 Riot[5387:2383892] [MXFileStore] saveUsers in 13ms
2017-03-17 09:31:45.381440 Riot[5387:2383385] [MXFileStore commit] Background task #96 is complete - lasted 9799ms
2017-03-17 09:31:45.395292 Riot[5387:2383892] [MXFileStore commit] lasted 14ms for 1 rooms
2017-03-17 09:31:45.397549 Riot[5387:2383385] [MXFileStore commit] Background task #97 is complete - lasted 9814ms
2017-03-17 09:31:45.412270 Riot[5387:2383892] [MXFileStore commit] lasted 15ms for 1 rooms
2017-03-17 09:31:45.414617 Riot[5387:2383385] [MXFileStore commit] Background task #98 is complete - lasted 9829ms
2017-03-17 09:31:45.429228 Riot[5387:2383892] [MXFileStore commit] lasted 15ms for 1 rooms
2017-03-17 09:31:45.431620 Riot[5387:2383385] [MXFileStore commit] Background task #99 is complete - lasted 9840ms
2017-03-17 09:31:45.444093 Riot[5387:2383892] [MXFileStore] saveUsers in 12ms
2017-03-17 09:31:45.452871 Riot[5387:2383892] [MXFileStore commit] lasted 9ms for metadata
2017-03-17 09:31:45.454736 Riot[5387:2383385] [MXFileStore commit] Background task #100 is complete - lasted 8890ms
2017-03-17 09:31:45.467856 Riot[5387:2383892] [MXFileStore] saveUsers in 13ms
2017-03-17 09:31:45.477121 Riot[5387:2383892] [MXFileStore commit] lasted 9ms for metadata
2017-03-17 09:31:45.478961 Riot[5387:2383385] [MXFileStore commit] Background task #102 is complete - lasted 7682ms
2017-03-17 09:31:45.492811 Riot[5387:2383892] [MXFileStore] saveUsers in 14ms
2017-03-17 09:31:45.501824 Riot[5387:2383892] [MXFileStore commit] lasted 9ms for metadata
2017-03-17 09:31:45.503546 Riot[5387:2383385] [MXFileStore commit] Background task #104 is complete - lasted 7179ms
2017-03-17 09:31:45.516896 Riot[5387:2383892] [MXFileStore] saveUsers in 13ms
2017-03-17 09:31:45.525705 Riot[5387:2383892] [MXFileStore commit] lasted 9ms for metadata
2017-03-17 09:31:45.527465 Riot[5387:2383385] [MXFileStore commit] Background task #106 is complete - lasted 5059ms
2017-03-17 09:31:45.540875 Riot[5387:2383892] [MXFileStore] saveUsers in 13ms
2017-03-17 09:31:45.549762 Riot[5387:2383892] [MXFileStore commit] lasted 9ms for metadata
2017-03-17 09:31:45.551501 Riot[5387:2383385] [MXFileStore commit] Background task #108 is complete - lasted 4404ms
2017-03-17 09:31:45.559848 Riot[5387:2383892] [MXFileStore commit] lasted 8ms for 1 rooms
2017-03-17 09:31:46.068982 Riot[5387:2383892] [MXFileStore commit] lasted 509ms for 1 rooms state
2017-03-17 09:31:46.201230 Riot[5387:2383892] [MXFileStore commit] lasted 132ms for receipts in 1 rooms
2017-03-17 09:31:46.214190 Riot[5387:2383892] [MXFileStore commit] lasted 13ms for metadata
2017-03-17 09:31:46.217702 Riot[5387:2383385] [MXFileStore commit] Background task #110 is complete - lasted 3896ms
2017-03-17 09:31:46.226095 Riot[5387:2383892] [MXFileStore commit] lasted 8ms for 1 rooms
2017-03-17 09:31:46.711513 Riot[5387:2383892] [MXFileStore commit] lasted 485ms for 1 rooms state
2017-03-17 09:31:46.722574 Riot[5387:2383892] [MXFileStore commit] lasted 10ms for metadata
2017-03-17 09:31:46.725864 Riot[5387:2383385] [MXFileStore commit] Background task #112 is complete - lasted 3807ms
2017-03-17 09:31:46.733600 Riot[5387:2383892] [MXFileStore commit] lasted 8ms for 1 rooms
2017-03-17 09:31:47.221307 Riot[5387:2383892] [MXFileStore commit] lasted 488ms for 1 rooms state
2017-03-17 09:31:47.232654 Riot[5387:2383892] [MXFileStore commit] lasted 11ms for metadata
2017-03-17 09:31:47.235917 Riot[5387:2383385] [MXFileStore commit] Background task #114 is complete - lasted 3707ms
2017-03-17 09:31:47.248713 Riot[5387:2383892] [MXFileStore] saveUsers in 13ms
2017-03-17 09:31:47.257204 Riot[5387:2383892] [MXFileStore commit] lasted 8ms for metadata
2017-03-17 09:31:47.258934 Riot[5387:2383385] [MXFileStore commit] Background task #116 is complete - lasted 3129ms
...

[manuroe]

lasted 509ms for 1 rooms state

This is where IO time will be saved.
Aggregating pending commits will factorise writing for the same rooms.