[LLVMdev] RFC:LNT Improvements

[Yi Kong]

On 30/04/14 15:34, Tobias Grosser wrote:
> On 30/04/2014 16:20, Yi Kong wrote:
>> On 30 April 2014 07:50, Tobias Grosser <tobias at grosser.es> wrote:
>>   >> - Show and graph total compile time
>>   >>    There is no obvious way to scale up the compile time of
>>   >> individual benchmarks, so total time is the best thing we can do to
>>   >> minimize error.
>>   >>    LNT: [PATCH 1/3] Add Total to run view and graph plot
>>   >
>>   > I did not see the effect of these changes in your images and also
>>   > honestly do not fully understand what you are doing. What is the
>>   > total compile time? Don't we already show the compile time in run
>>   > view? How is the total time different to this compile time?
>>
>> It is hard to spot minor improvements or regressions over a large number
>> of tests from independent machine noise. So I added a "total time"
>> analysis to the run report and able to graph its trend, hoping that
>> noise will cancel out and will help us to easily spot. (Screenshot
>> attached)
>
> I understand the picture, but I still don't get how to compute "total
> time". Is this a well known term?
>
> When looking at the plots of our existing -O3 testers, I also look for
> some kind of less noisy line. The first thing coming to my mind would
> just be the median of the set of run samples. Are you doing something
> similar? Or are you computing a value across different runs?

That's the total time taken to compile/execute. Put it in another way,
sum of compile/execution time of all tests.

Cheers,
Yi Kong

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