perfSONAR User Q&A and Other Discussion

[Brian Candler <>]

On 14/06/2017 16:12, Michael Johnson wrote:
> On Wed, Jun 14, 2017 at 07:42:16AM +0000, Brian Candler wrote:
> > Looking at the graphs from perfsonar 4.0, I notice some changes from 
> > 3.5, and I wonder whether all of these are intentional.
> >
> > (1) If I set a throughput test to run at 1 hour intervals, it seems 
> > "jerky". Sometimes the interval between tests is 2 hours; sometimes 
> > it is only 20 minutes.
>
> I haven't heard of this, what makes you think it's a graphing bug and 
> not a function of the test schedule? If you can share an example, we 
> can look into it.
Sure. I'll give you server IP off-list, but the configuration is simple:

* Throughput test, interval set to 1 hour but all other parameters 
unchanged, add one or two hosts.

> > (2) It used to be possible to expand the graph further by dragging in 
> > an area under the graph.  If there is still a way to do it, I can't 
> > see how.
>
> Scrolling up and down, over the graph area, zooms in and out.
Thanks, that's good.

> > (3) If I zoom in to the 1 day level, the summary window remains at 
> > 300 seconds (like it is at the 3 day level).  Previously at this 
> > level, the summary window was 0.
>
> I didn't think we changed that summary window, but I could be 
> mistaken. As you've discovered, yes, you can override that in the URL. 
> Be careful because you could overtax the MA if you try to load a 
> month's worth of raw data, for instance. Any choice we make here is 
> inherently a tradeoff between performance and chart detail.
I think it has changed. If that change was unintentional, it can be 
changed back.  That, combined with the zooming, would be fine for me.

Incidentally, the summary interval is such an important property for 
interpreting the graph that I think it ought to be displayed somewhere 
on the page.

> There are also plans to have a more sophisticated way of picking 
> date/timerange. For now, does zooming get you more detail?
Zooming is good, but I would like the summaryWindow to be zero when at 
the 1-day zoom level.

Cheers,

Brian.