On Wed, May 16, 2012 at 5:54 PM, Vladimir Vuksan <[email protected]> wrote:
> There is a blog post about a new feature in Ganglia Web called overlay
> timeshifted data
>
> http://ganglia.info/?p=543
This is awesome. We've been working on a similar ability just using php
based reports. Two things additional we wanted to be able to do besides
just comparing one time period to the previous:
a) Compare two arbitrary time periods. In our case we run performance /
load tests & want to be able to compare a loadtest run X minutes ago with
one run Y minutes ago. The delta between X & Y is the timeshift. We can do
this for any given interval (1h, 2h, 1d, 1w, etc)
b) Rather than just show the two metrics overlayed, we wanted to calculate
the % difference between two periods. This becomes more useful in
production where we want to know if a particular trend has changes more
than N% over some period of time (say post-deployment).
Down the road we also want to try to normalize the "previous period" by
averaging multiple previous periods. For example, compare Monday this week
w/ the average of the last 3 Monday's.
I can pass along a blog post here with more details when I get it written
up - but being able to do those two things was pretty crucial to us & may
be useful to others.
Thanks for the continued work on this - awesome progress.
Aaron
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