I am using Vegeta to make some stress test but I am having some trouble while generating a json report. Running the following command I am able to see text results:
vegeta attack -targets="./vegeta_sagemaker_True.txt" -rate=10 -duration=2s | vegeta report -output="attack.json" -type=text
Requests [total, rate] 20, 10.52
Duration [total, attack, wait] 2.403464884s, 1.901136s, 502.328884ms
Latencies [mean, 50, 95, 99, max] 945.385864ms, 984.768025ms, 1.368113304s, 1.424427549s, 1.424427549s
Bytes In [total, mean] 5919, 295.95
Bytes Out [total, mean] 7104, 355.20
Success [ratio] 95.00%
Status Codes [code:count] 200:19 400:1
Error Set:
400
When I run the same command changing -type-text to -type=json I receive really weird numbers ad they don't make sense for me:
{
"latencies": {
"total": 19853536952,
"mean": 992676847,
"50th": 972074984,
"95th": 1438787021,
"99th": 1636579198,
"max": 1636579198
},
"bytes_in": {
"total": 5919,
"mean": 295.95
},
"bytes_out": {
"total": 7104,
"mean": 355.2
},
"earliest": "2019-04-24T14:32:23.099072+02:00",
"latest": "2019-04-24T14:32:25.00025+02:00",
"end": "2019-04-24T14:32:25.761337546+02:00",
"duration": 1901178000,
"wait": 761087546,
"requests": 20,
"rate": 10.519793517492838,
"success": 0.95,
"status_codes": {
"200": 19,
"400": 1
},
"errors": [
"400 "
]
}
Does anyone know why this should be happening?
Thanks!
These numbers are nanoseconds -- the internal representation of time.Duration in Go.
For example, the latencies.mean in the JSON is 992676847, which means 992676847 nanoseconds, that is 992676847/1000/1000 = 992.676847ms.
Actually, in vegeta, if you declare type as text (-type=text), it will use NewTextReporter, and print the time.Duration as a user-friendly string. If you declare type as json (-type=json), it will use NewJSONReporter and return time.Duration's internal representation:
A Duration represents the elapsed time between two instants as an int64 nanosecond count. The representation limits the largest representable duration to approximately 290 years.