Commits on Mar 12, 2024

1. chore(labs): improve build and test speed …

   This changeset optimizes the Guava build significantly by enabling
   parallel build and test features supported by Maven. With these
   flags enabled, only a few tests exhibit flaky behavior; applying a
   sensible count of test retries (3) solves the problem.
   
   As a result, the testsuite can now be executed often, because it
   takes about 2 minutes to run. Building is also much faster. After
   benchmarking different configurations, 2-threads-per-core and
   2-test-forks-per-core seems optimal:
   
   ```
   [INFO] Guava Maven Parent ..................... SUCCESS [  0.121 s]
   [INFO] Guava: Google Core Libraries for Java .. SUCCESS [  9.681 s]
   [INFO] Guava BOM .............................. SUCCESS [  0.120 s]
   [INFO] Guava Testing Library .................. SUCCESS [ 47.883 s]
   [INFO] Guava Unit Tests ....................... SUCCESS [01:57 min]  <--
   [INFO] Guava GWT compatible libs .............. SUCCESS [  6.909 s]
   ```
   
   When built and executed serially:
   ```
   [INFO] Guava Maven Parent ..................... SUCCESS [  0.129 s]
   [INFO] Guava: Google Core Libraries for Java .. SUCCESS [ 15.653 s]
   [INFO] Guava BOM .............................. SUCCESS [  0.064 s]
   [INFO] Guava Testing Library .................. SUCCESS [01:26 min]
   [INFO] Guava Unit Tests ....................... SUCCESS [06:26 min] <--
   [INFO] Guava GWT compatible libs .............. SUCCESS [ 11.092 s]
   ```
   
   Benchmark hardware:
   - Apple M2 Max, 96GB RAM
   - macOS Sonoma 14.3.1
   - GraalVM CE JVM 21.0.2
   
   ```
   openjdk version "21.0.2" 2024-01-16
   OpenJDK Runtime Environment GraalVM CE 21.0.2+13.1 (build 21.0.2+13-jvmci-23.1-b30)
   OpenJDK 64-Bit Server VM GraalVM CE 21.0.2+13.1 (build 21.0.2+13-jvmci-23.1-b30, mixed mode, sharing)
   ```
   
   - chore: enable parallel build
   - chore: enable parallel test execution
   - chore: enable parallel gc for maven
   - chore: tune tiered compilation for maven
   - chore: tune thread count for maven
   - fix: enable test retries (max = 3) for parallel-flaky tests
   
   Signed-off-by: Sam Gammon <sam@elide.ventures>

   

   sgammon committed Mar 12, 2024
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