[bitbake-devel] New progress meters

[Gary Thomas]

On 2016-07-19 11:16, Paul Eggleton wrote:
> Hi Gary,
>
> On Tue, 19 Jul 2016 08:33:54 Gary Thomas wrote:
>> I quite like the new progress meters, but they seem to not be very
>> accurate.  I was just rebuilding webkitgtk and got this:
>>
>> 0: webkitgtk-2.12.3-r0 do_compile (pid 30494)  96%
>> |#######################################  | ETA:  0:02:58
>>
>> Sadly, it sat there, waffling between 02:58 and 03:44 for about
>> 10 minutes...
>>
>> * How is this [estimate] calculated?
>> * Should I be concerned when it's not accurate (or even moving)?
>
> There are a few different types of progress handling for different types of
> tasks. To be specific in this example, for recipes that inherit cmake during
> do_compile we report the progress that the cmake-produced makefile prints out.
> The ETA, which is implemented in the python-progressbar code we are using is
> kind of a rolling average calculated based on recent progress, so it's
> possible it's inaccurate in this instance if there are places where it stalls.
> Python-progressbar has an alternative ETA mode which we could try, but to be
> honest when the progress value sent to it isn't evenly apportioned with
> respect to time and we don't have any weighting information, there's not a lot
> anyone can do to estimate time remaining accurately. If it's truly bothersome
> we could just turn off the ETA display I suppose.
>
>> n.b. I wasn't sure the best place for this question, the bitbake
>> list, generic Yocto or OE-core.  Feel free to redirect as needed.
>
> Technically this is an OE question although I know that isn't obvious - there
> are parts of this that are implemented in BitBake and parts in OE, so asking
> here is fine.

Thanks.  I was mostly asking to see what the expected "user experience"
should be since the webkitgtk (which takes FOREVER to build) seemed a
bit misleading/optimistic.  For the most part, I do like the additional
information.

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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