Is this a possibility? Looks nicer. http://style.org/chartapi/sparklines/ ----- Original Message ----- From: "Alexander Wels" <awels@redhat.com> To: engine-devel@ovirt.org Cc: "Malini Rao" <mrao@redhat.com>, "Tomas Jelinek" <tjelinek@redhat.com>, "Eldan Hildesheim" <ehildesh@redhat.com>, "info" <info@eldanet.com> Sent: Wednesday, November 6, 2013 10:46:01 AM Subject: Re: [Engine-devel] [UX] how to design a bar/line chart? Maybe gchart is an option? Examples available here [1] one of the available charts is a spark line. I just don't know how well that will play with our grid implementation. [1] http://clientsidegchart.googlecode.com/svn/trunk/javadoc/com/googlecode/gcha... On Wednesday, November 06, 2013 10:24:56 AM Malini Rao wrote:
Hey all,
Comments inline-
----- Original Message -----
From: "Tomas Jelinek" <tjelinek@redhat.com> To: "Einav Cohen" <ecohen@redhat.com> Cc: "engine-devel" <engine-devel@ovirt.org>, "Eldan Hildesheim" <ehildesh@redhat.com>, "info" <info@eldanet.com>, "Malini Rao" <mrao@redhat.com>, "Martin Polednik" <mpoledni@redhat.com> Sent: Wednesday, November 6, 2013 9:58:03 AM Subject: Re: [Engine-devel] [UX] how to design a bar/line chart?
Hi Einav,
----- Original Message -----
From: "Einav Cohen" <ecohen@redhat.com> To: "Tomas Jelinek" <tjelinek@redhat.com> Cc: "engine-devel" <engine-devel@ovirt.org>, "Eldan Hildesheim" <ehildesh@redhat.com>, "info" <info@eldanet.com>, "Malini Rao" <mrao@redhat.com> Sent: Wednesday, November 6, 2013 3:26:15 PM Subject: Re: [Engine-devel] [UX] how to design a bar/line chart?
Hi Tomas,
Like Itamar, I think that a line chart is a better idea, and that a chart per monitored fact (rather than a combined chart) is better.
OK
Based on the original request in the bug, it seems like Itamar is looking for a trend rather than just one data point. I think we are thinking along the correct lines here with a line graph but I think more specifically, we should consider sparklines - http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0001OR. Agree that we should have one sparkline per fact but we may have to see how this looks when multiple sparklines reside in columns next to each other. See example of a grid where there are 2 sparklines next to each other - http://www.panopticon.com/Tables-Grids
the statistics readable enough. Maybe if you hover the chart it could pop up a bigger version of the chart? Or not needed?
this is a nice-to-have, I think, definitely not needed.
OK
Agree. As shown in the glucose example in the Tufte link I posted above, maybe all we need is to indicate the acceptable range with a band and if the last point is in the range or outside, it will be clear to the user if they should pay attention to it.
- Would it be enough to have it in one color? Or should it be something like "the bigger the utilization the more red"?
question is what will happen when there are a lot of "jumps": let's say that the graph changes from 0% to 100% to 0% to 100% and so on... what will be painted red? the entire line, but only in the periods that it jumps to 100%? only the parts of line that are in 100%? maybe a single color is enough.
OK
One color with a dot to indicate the most recent or most relevant data and display its value next to the sparkline
I have another concern about this feature: currently, the GUI's most frequent refresh rate available is 5 seconds, which means that the line will "change" only every 5 seconds, which would be more noticeably slow when displayed in a form of a line chart (not even talking about lower frequencies). Moreover, I am not sure at what rate the VM statistics are pulled from VDSM, but if it is 10 seconds or 15 seconds, it means that the line in the GUI will be "flat" for every 2 reads / 3 reads, which is not so good, I think.
any thoughts around that?
Good point! AFAIK the VDSM is polled each 3 seconds for basic info (e.g. the resource usage not included) and than every 5th poll (e.g. every 15 seconds) for full data (with resource usage not included). This would indeed make the graph pretty useless.
Michal proposed to do some averages on the VDSM site from more frequent sampling and send this average back to engine when polled - so we would display an average after each poll (15s).
I wonder if something like this is not already used on other places: @Martin, do you know about something like this?
Why does the change in the line need to seem palpable every few seconds? I think the base requirement of how accurate the data is when a user looks at a grid has not changed.. just the data visualization. Right? So , if the refresh rate is not a problem today, why is it a problem now? Am I missing something?
----- Original Message -----
From: "Itamar Heim" <iheim@redhat.com> To: "Tomas Jelinek" <tjelinek@redhat.com>, "engine-devel" <engine-devel@ovirt.org> Sent: Tuesday, November 5, 2013 10:10:34 AM Subject: Re: [Engine-devel] [UX] how to design a bar/line chart?
On 11/05/2013 11:50 AM, Tomas Jelinek wrote:
Hi all,
There is a feature request [1] which aims to replace the resource utilization graphs (for example the cpu utilization from vm tab) by some which shows not only the actual percentage which is not so useful by some monitor graph.
I have the following concerns: - I can think of a bar chart or a line chart and not sure what would be better. - Not sure if replacing the current chart with a bar/line chart would make the statistics readable enough. Maybe if you hover the chart it could pop up a bigger version of the chart? Or not needed? - Would it be enough to have it in one color? Or should it be something like "the bigger the utilization the more red"?
Please advise from the UX perspective. As soon as the final design will be a bit more clear I will provide a feature page.
Thank you, Tomas
[1]: https://bugzilla.redhat.com/show_bug.cgi?id=803251 _______________________________________________ Engine-devel mailing list Engine-devel@ovirt.org http://lists.ovirt.org/mailman/listinfo/engine-devel
a moving trend graph (just like fedora's system monitor for cpu/ram/network) is what i have in mind. so a line chart. you could have a single chart with different lines for cpu/ram/network, or what seems to be more common, a chart per monitored fact _______________________________________________ Engine-devel mailing list Engine-devel@ovirt.org http://lists.ovirt.org/mailman/listinfo/engine-devel
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