Commits on Jul 27, 2023

1. .bazelrc: enable skymeld by default …

   Skymeld config helps us start build actions without having to wait for
   all repository rules to finish executing in Analysis phase.
   
   Effectively, this let us start the frontend builds earlier without
   having to wait for the Go external dependencies and toolchain to finish
   loading.
   
   Some benchmarks
   
   1. Building `//server` without remote cache
   
      ```bash
      > hyperfine --prepare 'bazel clean --async' \
                  --warmup 1 \
                  'bazel build --config=x -k --remote_instance_name="$RANDOM" server' \
                  'bazel build --config=x -k --remote_instance_name="$RANDOM" --config=skymeld server'
   
      Benchmark 1: bazel build --config=x -k --remote_instance_name="$RANDOM" server
        Time (mean ± σ):     241.279 s ± 42.673 s    [User: 0.134 s, System: 0.149 s]
        Range (min … max):   169.694 s … 318.005 s    10 runs
   
      Benchmark 2: bazel build --config=x -k --remote_instance_name="$RANDOM" --config=skymeld server
        Time (mean ± σ):     213.551 s ± 75.335 s    [User: 0.118 s, System: 0.129 s]
        Range (min … max):   148.260 s … 400.258 s    10 runs
   
      Summary
        bazel build --config=x -k --remote_instance_name="$RANDOM" --config=skymeld server ran
          1.13 ± 0.45 times faster than bazel build --config=x -k --remote_instance_name="$RANDOM" server
      ```
   
   2. Building `//server` with remote cache
   
      ```bash
      > hyperfine --prepare 'bazel clean --async' \
                  --warmup 1 \
                  'bazel build --config=x -k server' \
                  'bazel build --config=x -k --config=skymeld server'
   
      Benchmark 1: bazel build --config=x -k server
        Time (mean ± σ):     19.282 s ±  0.473 s    [User: 0.014 s, System: 0.023 s]
        Range (min … max):   18.656 s … 20.218 s    10 runs
   
      Benchmark 2: bazel build --config=x -k --config=skymeld server
        Time (mean ± σ):     17.732 s ±  0.407 s    [User: 0.014 s, System: 0.023 s]
        Range (min … max):   17.118 s … 18.626 s    10 runs
   
      Summary
        bazel build --config=x -k --config=skymeld server ran
          1.09 ± 0.04 times faster than bazel build --config=x -k server
      ```
   
   3. Testing everything with remote cache
   
      ```bash
      > hyperfine --prepare 'bazel clean --async' \
                      --warmup 1 \
                      'bazel build --config=x -k //...' \
                      'bazel build --config=x -k --config=skymeld //...'
      Benchmark 1: bazel build --config=x -k //...
        Time (mean ± σ):     27.113 s ±  1.020 s    [User: 0.014 s, System: 0.020 s]
        Range (min … max):   25.938 s … 28.833 s    10 runs
   
      Benchmark 2: bazel build --config=x -k --config=skymeld //...
        Time (mean ± σ):     25.349 s ±  1.155 s    [User: 0.014 s, System: 0.021 s]
        Range (min … max):   23.567 s … 27.314 s    10 runs
   
      Summary
        bazel build --config=x -k --config=skymeld //... ran
          1.07 ± 0.06 times faster than bazel build --config=x -k //...
      ```
   
   Overall, using Skymeld gives a +7-14% speed improvement over the
   existing setup.
   
   Removed `--experimental_skymeld_ui` as it's a no-op flag.

   

   sluongng committed Jul 27, 2023
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