LATENCY command and related subcommands

Dragonfly Technical
41

yes

42

trying that now

43 
admin@dragonfly-testing:~$ memtier_benchmark -h dragonfly.***.*** --ratio 1:0  -n  10000
Writing results to stdout
[RUN #1] Preparing benchmark client...
[RUN #1] Launching threads now...
[RUN #1 100%,  10 secs]  0 threads:     2000000 ops,  204977 (avg:  199985) ops/sec, 15.42MB/sec (avg: 15.05MB/sec),  0.97 (avg:  1.00) msec latency

4         Threads
50        Connections per thread
10000     Requests per client


ALL STATS
============================================================================================================================
Type         Ops/sec     Hits/sec   Misses/sec    Avg. Latency     p50 Latency     p99 Latency   p99.9 Latency       KB/sec
----------------------------------------------------------------------------------------------------------------------------
Sets       193587.77          ---          ---         0.99960         0.97500         2.07900         4.95900     14913.65
Gets            0.00         0.00         0.00             ---             ---             ---             ---         0.00
Waits           0.00          ---          ---             ---             ---             ---             ---          ---
Totals     193587.77         0.00         0.00         0.99960         0.97500         2.07900         4.95900     14913.65

Awaiting metrics in grafana and will update shortly

44

initial set latency (milliseconds unit) pointing to the same range

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45

which I don’t really trust, I think memtier benchmark is a better source of truth at the moment

46

yes your memtier numbers looks correct

47

if the latency is 200ms the numbers would be quite different

48

definitely

49

I will ask other guys what can be the reason with grafana, if find the answer let you know

50

sounds great, thanks for all the help

51

and version just in case:

admin@dragonfly:~$ dragonfly --version
dragonfly v1.12.1-053a33d24df939d1c35f3b6f233a0c57ac185184
build time: 2023-11-06 11:40:00
52

@reliable-impala Could you also check what latency shows by dragonfly latency command

53

I was told that grafana uses server latency and should be less than memtier because we don’t have wastes on networking

54

yes, i’ll do further testing and see if i can get you an answer by monday

55

maybe somehow grafana shows latency in the incorrect measure

56

is there a specific latency command that you want me to run?

57

just simple latency command that you have mentioned

58

will do

59

I think instead of 250ms it should be 2.5 ms or 250us

60

if I right understand how grafana works)