[webkit-dev] LayoutTests results fallback graph

James Robinson jamesr at google.com
Sun Jul 10 12:01:50 PDT 2011

On Jul 10, 2011 10:53 AM, "Adam Barth" <abarth at webkit.org> wrote:
> Hi webkit-dev,
> In trying to understand how our LayoutTest results system works, I've
> created a digram of the fallback graph among the various
> platform-specific directories:
> Unfortunately, the fallback graph is not a tree, as one might imagine
> initially.  I'd like to propose two small changes, which will
> hopefully make the system more sensible globally.  I'm happy to do all
> the work required to make these changes:
> 1) The "win" port should fall back either to "all" (the platform
> independent results) or to "mac," but not to "mac-snowleopard", as it
> does currently.  (I slightly prefer "all", but "mac" would also be
> fine with me.)
> 2) The "chromium" port should fall back directly to "all" rather than
> taking a detour through various Apple-maintained ports, as it does
> currently.
> These changes have the following virtues:
> A) The resulting fallback graph will be a tree, making the fallback
> graph easier to understand for both humans and automated tools.
> B) The Chromium port will behave more like the other ports (e.g., GTK
> and Qt), rather than being a parasite on Apple-maintained ports.
> These changes might increase the number of image baselines we store in
> the tree for "chromium-mac"-derived ports (because there will be fewer
> redundant fallback paths), but I expect that cost to be relatively
> small because essentially every port has different image baselines
> anyway

Could you measure this? I suspect that not falling back on the mac pixel
results will mean checking in a few thousand more pngs, but that's just a

- James

> Thoughts?
> Adam
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