Timings
Description
Timing stats provide histogram data from high resolution timers over various operations within the system.
Request Example
To request the timings statistic, use the following syntax:
cbstats [host]:[dataport] timingsThe following example, uses the 10.5.2.117 host and the default port, 11210:
cbstats 10.5.2.117:11210 timingsResponse
The following is sample output from cbstats timings :
disk_commit (1024 total)
0 - 1s : (100.00%) 1024 ###################################################
Avg : ( 1s)
get_stats_cmd (30663276 total)
0 - 1us : ( 0.05%) 14827
1us - 2us : ( 6.56%) 1995778 ##
2us - 4us : ( 41.79%) 10804626 ##############
4us - 8us : ( 45.20%) 1044043 #
8us - 16us : ( 45.49%) 89929
16us - 32us : ( 45.90%) 124472
32us - 64us : ( 46.38%) 148935
64us - 128us : ( 56.17%) 2999690 ###
128us - 256us : ( 68.57%) 3804009 ####
256us - 512us : ( 69.91%) 411281
512us - 1ms : ( 78.77%) 2717402 ###
1ms - 2ms : ( 96.36%) 5391526 #######
2ms - 4ms : ( 99.05%) 826345 #
4ms - 8ms : ( 99.96%) 278727
8ms - 16ms : (100.00%) 11443
16ms - 32ms : (100.00%) 217
32ms - 65ms : (100.00%) 19
65ms - 131ms : (100.00%) 7
Avg : ( 347us)
disk_vbstate_snapshot (93280 total)
32us - 64us : ( 15.34%) 14308 ######
64us - 128us : ( 74.74%) 55413 #########################
128us - 256us : ( 91.39%) 15532 #######
256us - 512us : ( 95.69%) 4007 #
512us - 1ms : ( 99.49%) 3546 #
1ms - 2ms : ( 99.95%) 423
2ms - 4ms : ( 99.99%) 43
4ms - 8ms : (100.00%) 4
2s - 4s : (100.00%) 4
Avg : ( 190us)
notify_io (4 total)
4us - 8us : ( 25.00%) 1 ############
16us - 32us : ( 75.00%) 2 ########################
32us - 64us : (100.00%) 1 ############
Avg : ( 17us)
The following are the possible return values provided by cbstats timings. The return values provided by this command depend on what has actually occurred on a data bucket:
| Values | Description |
|---|---|
| bg_load | Background fetches waiting for disk |
| bg_wait | Background fetches waiting in the dispatcher queue |
| data_age | Age of data written to disk |
| disk_commit | Time waiting for a commit after a batch of updates |
| disk_del | Wait for disk to delete an item |
| disk_insert | Wait for disk to store a new item |
| disk_vbstate_snapshot | Time spent persisting vbucket state changes |
| disk_update | Wait time for disk to modify an existing item |
| get_cmd | Servicing get requests |
| get_stats_cmd | Servicing get_stats requests |
| set_vb_cmd | Servicing vbucket set state commands |
| item_alloc_sizes | Item allocation size counters (in bytes) |
| notify_io | Time for waking blocked connections |
| storage_age | Time since most recently persisted item was initially queued for storage. |
| tap_mutation | Time spent servicing tap mutations |