perfSONAR User Q&A and Other Discussion

[Andrew Lake <>]

Hi Andrew,

I assume this is coming out of the old esmond interface? You are correct that the key is the bucket and the value is the count of results belonging to that. IIRC The buckets are always normalized to milliseconds so in your example 198 samples measured at -.01ms, 95 at -.02ms and so forth. The bucket resolution is dependent on what’s configured for the test using the “bucket-width” parameter. I believe 1/100th of a millisecond is the default if not specified. If it is set to something else you’ll see it in the “bucket-width” parameter of the metadata for the test. You are also correct that buckets with no observed values are suppressed. 

Thanks,

Andy

On April 18, 2024 at 11:55:37 AM, Andrew Gallo () wrote:

I have a couple of questions about the format of the results returned
from the API for owamp tests.


Here is a sample I'm looking at

> {
> "ts": 1710482312,
> "val": {
> "-0.01": 198,
> "-0.02": 95,
> "-0.03": 28,
> "-0.04": 5,
> "0.0": 156,
> "0.01": 82,
> "0.02": 28,
> "0.04": 7,
> "0.07": 1
> }
> },

The structure looks like key:value pairs, with the keys being the
latency measurements and the values being the number of results in that
'bucket.'

Is this correct?

Can I assume...
1. The resolution (or ‘bucket size’) is always 0.01 msec?
2. Buckets with no results are suppressed?



Thank you




--
________________________________
Andrew Gallo
The George Washington University