[atlas] Actual measurement interval much larger than planned
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Cristel Pelsser
pelsser at unistra.fr
Fri Sep 2 09:45:48 CEST 2016
Hi Wenqin, It may be because the probe is busy doing other things. We noticed a high interval between the scheduling and the actual measurement of one-off measurements on busy probes in http://conferences.sigcomm.org/imc/2015/papers/p437.pdf <http://conferences.sigcomm.org/imc/2015/papers/p437.pdf> Cristel > On Sep 1, 2016, at 7:14 PM, Wenqin SHAO <wenqin.shao at telecom-paristech.fr> wrote: > > Dear list, > > I encountered some cases where the actual time interval between two neighbouring measurements being much larger than the scheduled value. > Have you witnessed similar cases? I appreciate explanations on underlying reasons. > > Here goes an example: > > from ripe.atlas.cousteau import AtlasResultsRequest > filters = dict(msm_id=1010, probe_ids=[16981], start=1470055258, stop=1470056217) > is_success, results = AtlasResultsRequest(**filters).create() > if is_success: > for mes in results: > print mes.get('timestamp', -1) > > The above code requests some built-in ping measurements (240s interval) made by probe 16981 and prints their timestamps. See below for the execution result: > > 1470055259 > 1470055499 > 1470055978 > 1470056216 > > Four measurements are retrieved within the given time range. I noticed that time interval between the 2nd and the 3rd measurement is 479s much larger than the planned value 240s. > How come? > > Many thanks for your attention. > > Best regards, > wenqin -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.ripe.net/ripe/mail/archives/ripe-atlas/attachments/20160902/787f5ef5/attachment.html>
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