[Haskell-cafe] call tree of cost centers in a .prof file

[Oliver Charles]

Is a thunk produced by binMixtureData is *forced* by outerD?

On Sat, 5 Sep 2020, at 9:49 PM, Marco Zocca wrote:
> Hi all,
> 
>   I don't understand the tree-shaped visualizations produced by
> profiteur, profiterole and ghc-prof-flamegraph .
> 
> Specifically, I initially thought that cost centers that are displayed
> closer to the leaves would be due to calls higher up in the tree, but
> that doesn't seem to be the case.
> 
> Example; I've produced this basic visualization with ghc-prof and
> Data.Tree.drawTree (which mirrors qualitatively what flamegraph et al.
> produce) :
> 
> MAIN 100.0
> |
> +- Main.trained 100.0
> |  |
> |  +- ER.ML.Classification.logreg 99.2
> |  |  |
> |  |  +- ER.ML.Classification.irls 96.4
> |  |  |  |
> |  |  |  +- ER.ML.Classification.hessianC 30.3
> |  |  |  |  |
> |  |  |  |  +- ER.Math.Matrix.outerD 30.3
> |  |  |  |  |  |
> |  |  |  |  |  `- Main.binMixtureData 29.8
> |  |  |  |  |     |
> |  |  |  |  |     +- ER.Math.Random.SplitMix.mvNormalSM 28.8
> |  |  |  |  |     |  |
> |  |  |  |  |     |  `- ER.Math.Matrix.matVec 28.2
> |  |  |  |  |     |
> |  |  |  |  |     `- ER.ML.Common.centerDataWMEC 1.0
> 
> It looks fine down to level 4 (trained calls logreg, which calls irls,
> which calls hessianC, which calls outerD), and then it stops making
> sense (binMixtureData is not ever called by outerD).
> 
> Could someone please shed some light on this?
> 
> Thank you in advance
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