PR Testing: Build Performance #15
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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 <[email protected]>
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Filed to run google#7093 against the existing CI suite.