[Webkit-unassigned] [Bug 256283] New: [WPE] Add new post-commit bots for performance tests with RPis

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=256283

            Bug ID: 256283
           Summary: [WPE] Add new post-commit bots for performance tests
                    with RPis
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clopez at igalia.com
                CC: bugs-noreply at webkitgtk.org

Now that the tooling for cross-building WebKit for a target device and running tests with it has landed (see bug 249031) it is time to add the bots

The main idea for the bots is the following

1) Build-only bot
- A bot (x86_64) will cross-build WPE for a specific target board like any of this: rpi3-32bits-mesa-vc4, rpi3-32bits-userland, rpi4-32bits-mesa-vc4, rpi3-64bits-mesa-vc4, rpi4-64bits-mesa-vc4
- The bot will also generate the image (OS) that will run on the board. This image will contain everything needed except WPE itself

2) Test-only bots
- This will be a set of RPis boards, each one will boot the image that was generated from the build-only boot (via NFS/tftp)
- The RPi will download the built-product from the test-only boot and run the performance tests
- For running the performance tests it will use the script browserperfdash-benchmark which is a wrapper around the script run-benchmark
- The results of the benchmarks will be uploaded to https://browserperfdash.igalia.com/


The proposed initial config contain this:

1) Two build-only bots for two build configurations:

 - WPE-Linux-RPi4-32bits-Mesa-Release-Perf-Build (builds with --cross-target=rpi4-32bits-mesa)
 - WPE-Linux-RPi4-64bits-Mesa-Release-Perf-Build (builds with --cross-target=rpi4-64bits-mesa)


2) 16 RPi4 testers for that configurations:

  - 8 RPi4 for the 32 bits config
  - 8 Rpi4 for the 64 bits config

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