add v2 benchmark#175
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Scaffolds four JVM-only subprojects under benchmark/ to visualize the performance characteristics of v1.10.0 (Maven artifact, com.github.doyaaaaaken.*) against v2.0.0 (this branch, com.jsoizo.*) on identical workloads. Subprojects: - benchmark/shared: deterministic data generation (CsvDataGen / DatasetSpec / DataStats) and environment probe. Depends only on kotlin-stdlib so it stays out of every benchmark classpath as a library. - benchmark/v1: JMH source set whose only kotlin-csv on classpath is com.jsoizo:kotlin-csv-jvm:1.10.0. Covers readAll(String/InputStream/File), iterative Sequence over File, readAllWithHeader, writeAll(OutputStream/File). - benchmark/v2: JMH source set whose only kotlin-csv on classpath is the current project. Mirrors the v1 workloads on the v2 API and adds V2BackendBenchmarks comparing java.io vs kotlinx-io paths. - benchmark/parity: JUnit subproject that intentionally puts both v1 and v2 on the test classpath (FQCNs do not collide) and asserts row-by-row equality on the HARD dataset for readAll/readAllWithHeader/writeAll. Classpath isolation is achieved by separating v1 and v2 into different Gradle resolution scopes; this stops Gradle from collapsing kotlinx-coroutines (and other transitive deps) to a single version across the two artifacts. Resolved jmhRuntimeClasspath was verified to contain v1 only on the v1 side and the v2 project only on the v2 side. JMH defaults: warmup=5, iterations=5, fork=2, modes=throughput+avgt, jvmArgs=[-Xms2g,-Xmx2g], JDK 21 toolchain. -Pbench.profile=large|gcprof| stackprof overrides the defaults for the long-running LARGE dataset and profiler runs. -Pjmh.include / -Pjmh.warmupIterations / -Pjmh.iterations / -Pjmh.fork allow per-invocation overrides for smoke runs.
Sets warmup=3, iter=3, fork=1, time=5s and restricts dataset @Param to SMALL and HARD via JMH '-p dataset' equivalent. Intended for the first issue #172 comment so readers see numbers before the full primary run finishes.
The MapProperty<String, ListProperty<String>> setter does not accept a plain List<String>. Wrap the value in objects.listProperty(...).set(...).
Restricts dataset @Param to SMALL/MEDIUM/HARD; the LARGE dataset is covered by the separate 'large' profile per the methodology in #172.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## version_2_0_0 #175 +/- ##
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