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yoshuawuyts's profile
yosh
yosh
yosh
@yoshuawuyts

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yosh

@yoshuawuyts

Software researcher. he/they

Berlin, UTC+2
blog.yoshuawuyts.com
Joined May 2009

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    1. yosh‏ @yoshuawuyts 28 Oct 2019
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      Realized (yet again) that while events in an emitter may form a DAG, during execution they very much form a tree. This is the same as with regular functions. Any given function may be called by many other functions. But it never has multiple callers simultaneously — so a tree!

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    2. yosh‏ @yoshuawuyts 28 Oct 2019
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      This is so obvious now that I'm kind of facepalming. This is how we've tracked events in Choo for years now. So what I'm thinking now is: how can we apply this to the compiler's query engine?

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      yosh‏ @yoshuawuyts 28 Oct 2019
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      [note: I know little about the compiler — apply plenty of salt please] I'm thinking it'd be *really* interesting to plot out the compiler queries as a flamegraph. Just the events, not the code. Then color code by event kind to visualize the different kinds of tasks.

      6:39 AM - 28 Oct 2019
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        2. yosh‏ @yoshuawuyts 28 Oct 2019
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          Could do differential flame graphs for different versions of the compiler too. See how new runs of the query engine compare to older runs. Also interesting to explore: adding in information about caching, system calls (fs, mostly), plotting flame scopes (to visualize spikes).

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        3. yosh‏ @yoshuawuyts 28 Oct 2019
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          @nnethercote's question of "can we add more tools to look at compiler perf" got me thinking about this. I think this could be an interesting approach to start looking at the compiler from a system level to see if patterns emerge that we can drill down on later.

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        4. yosh‏ @yoshuawuyts 28 Oct 2019
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          (I know there is a tracing command available already, but that's only a timeline right now — it's much easier to spot patterns by looking at (sorted) aggregates such as (differential) flamegraphs / flamescopes)

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        5. End of conversation

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