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Re: [tycho-dev] Fwd: [Bug 356888] Build performance drop with Tycho 0.13.0

This is correct: both the "calculation of the implicit target platform" (which I prefer to simply call "dependency resolution") and the interpretation of target definition files roughly take the same time. The difference to 0.12.0 however is that target file interpretation and dependency resolution are done in two separate slicer+projector calls. The reason is that only then it is possible to get a "correct", Eclipse-like interpretation of target files.

The good thing about this independent resolver calls is that the target file resolution always yields the same result, and hence can be cached - unfortunately it currently isn't the case, but this should be a quick win.

In the mid-term, there is even another optimization that we can do: For eclipse-feature, eclipse-repository, and the future eclipse-product packaging types, we could omit the dependency resolution (i.e. stop after target platform computation) and this which would save us more slicer+projector calls, making that version even faster than 0.12.0. With done, this shouldn't even be hard to do, but 353889 will still take me a while.


> -----Original Message-----
> From: tycho-dev-bounces@xxxxxxxxxxx [mailto:tycho-dev-bounces@xxxxxxxxxxx]
> On Behalf Of Igor Fedorenko
> Sent: Mittwoch, 5. Oktober 2011 15:25
> To: Tycho developers list
> Subject: [tycho-dev] Fwd: [Bug 356888] Build performance drop with Tycho
> 0.13.0
> Tobias,
> Do you mind explaining the difference between the new way of
> interpreting .target files and calculation of implicit target platform?
>  From what I understand, in both cases Tycho invokes slicer+projector in
> about the same way, so I assume performance should be comparable too...
> What am I missing?
> --
> Regards,
> Igor
> -------- Original Message --------
> Subject: [Bug 356888] Build performance drop with Tycho 0.13.0
> Date: Wed,  5 Oct 2011 09:17:22 -0400
> From: bugzilla-daemon@xxxxxxxxxxx
> To: igor@xxxxxxxxxxxxxx
> Product/Component: Tycho / Core
> Tobias Oberlies <tobias.oberlies@xxxxxxx> changed:
>             What    |Removed                     |Added
> --------------------------------------------------------------------------
> --
>             Platform|PC                          |All
>              Version|unspecified                 |0.13.0
>           OS/Version|Windows 7                   |All
> --- Comment #8 from Tobias Oberlies <tobias.oberlies@xxxxxxx> 2011-10-05
> 09:17:18 EDT ---
> There is one pretty obvious thing which we should fix first before
> investigating further:
> In Tycho 0.13.0, target definition files are (for the first time)
> interpreted
> correctly. This requires some potentially costly calls to p2, so the
> build is
> expected to take longer with 0.13.0 than with 0.12.0.
> Still, the current implementation is unnecessarily slow: In the loop which
> computes the target _platform_ [1] for each module, the target _definition
> file_ is resolved over and over again. We obviously need a cache for this.
> [1]
> --
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