Measured the actual Kotlin daemon peak RSS during a full cold compile
of :amethyst:compilePlayDebugKotlin (which transitively compiles
:quartz, :commons, :quic, :nestsClient as well, in parallel after the
earlier parallel-mode change). Peak RSS was ~6.3 GB at the previous
12g/4g setting, meaning heap usage peaked around 4-5 GB plus
metaspace and native memory.
Drops to -Xmx8g -XX:MaxMetaspaceSize=2g, which:
- Cuts committed-virtual-memory ask from 18 GB (Gradle 6g + Kotlin 12g)
to 14 GB, comfortably under typical CI runner RAM and well under the
15 GB available in this dev environment.
- Frees ~4 GB of headroom for the OS file cache, which speeds up
classpath snapshot I/O on incremental builds.
- Leaves clear headroom over peak usage so GC pressure stays low; we
re-measured cold compile after the change at 3m30s vs 3m34s before,
well within run-to-run noise.
- Peak Kotlin daemon RSS at the new setting: 4.96 GB, confirming the
daemon right-sizes itself rather than pinning the ceiling.
If a much larger codebase target lands later (e.g. iOS framework
compilation in this same daemon), bump back up — the value is not
sacred, it just shouldn't request more than the host can afford.
Kotlin 2.x removed the classpath-snapshot incremental-compilation
strategy in favor of ABI snapshots, which are always on. The flag is
now a deprecation warning at configuration time. Drop it.
Parallel + build-cache + bumped Kotlin daemon metaspace remain.
Halves cold compile time for compilePlayDebugKotlin on this machine
(6m25s -> 3m26s, 47% reduction):
- org.gradle.parallel=true lets quic/nestsClient/commons compile
concurrently once quartz is done, instead of serially.
- org.gradle.caching=true lets warm cross-clean builds reuse task
outputs.
- kotlin.incremental.useClasspathSnapshot=true narrows the incremental
recompile blast radius after dependency-jar changes.
- Bumps Kotlin daemon MaxMetaspaceSize 3g -> 4g for headroom under
the Compose IR phase across ~2.8K @Composable functions.
Up-to-date and same-file incremental times are unchanged (~3s and ~4s)
since those weren't bottlenecked by these settings.
Configuration cache is NOT enabled: amethyst/build.gradle:12 runs
'git rev-parse --abbrev-ref HEAD' at configuration time, which is
incompatible with the configuration cache. Migrating that to a
ValueSource is a separate change.
R8 minification of the play benchmark variant runs inside the Gradle
daemon. CI's 4 GB heap is now too tight after recent module growth and
:amethyst:minifyPlayBenchmarkWithR8 fails with java.lang.OutOfMemoryError.
GitHub Actions ubuntu-latest runners have ~16 GB, so 6 GB stays well
under the runner limit while leaving room for the kotlin daemon when it
is reused.
- Bring in the SwiftPackageManager for KMP plugin, to use Swift libraries for iOS implementations(and configure accordingly).
- Bring in cachemap dependency(for iOS LargeCache implementation).
- Fully converts OpenTimestamp Java codebase to Kotlin, migrating the sync and async HTTP call interfaces to OkHttp and coroutines
- Redesigns parsing of relay commands, messages and filters for performance in Jackson.
- Starts the use of KotlinX Serialization when speed is not a requirement
- Migrates all Jackson field annotations to Kotlin Serialization
- Migrates Regex use in Quarts to Kotlin's Regex class
- Migrates Base64 from Android to Kotlin
- Migrates UUID from Android/Java to Kotlin
- Migrates LRUCache usage from Android/Java to Kotlin collections
- Migrates all String to bytearray conversions to Kotlin methods
- Migrates all System.arraycopy calls to kotlin native ones.
- Separates parsing code from the data classes Companion objects
- Exposes Rfc3986 normalizations to each platform.
- Exposes URI parsing classes to each platform.
- Exposes URL Encoders to each platform.
- Exposes BigDecimal to each platform.
- Exposes the Url Detector to each platform.
- Exposes MacInstances to each platform
- Exposes Diggest instances to each platform.
- Exposes a BitSet to each platform.
- Exposes GZip to each platform.
- Exposes Secp256k1 to each platform.
- Exposes SecureRandom to each platform.
- Exposes Time in seconds to each platform.
- Exposes the LargeCache to each platform.
- Exposes AES CBC and AES GCM encryption/decryption to each platform
- Migrate test assertions to Kotlin Tests
- Exposes Address class to each platform because of the Parceleable
- Creates our own ByteArrayOutputStream.
- Removes Lock features inside the Bloomfilters because we don't need data consistency/
- Migrates UserMetadata parser from Jackson to Kotlin serialization
- Removes the need for Static methods in each tag.
- Adds an event template serializer
- Adds KotlinX Datetime to migrate some of the date-based logs
- Adds support for LibSodium in the JVM platform
- Creates a shared test build for iOS targets
- Fixes several usages of Reflection when serializing classes
- Fixes a bug on loading RelayDB for the HintBloom filter test
- Increases the Bloom filter space to better use hints in the app.
- Removes support for iOS in x86
- Creates a Jackson mapper just for NIP-55, which stays in the Android build only.
- Keeps the event store in the android build as well.
- Removes @Syncronized tags in favor of Mutexes.
- Improved sendAndWaitForResponse NostrClient method to properly account for returns from each relay.
- Removes the need for GlobalScope and async calls in the downloadFirstEvent method.
- Restructures the parser and serialization of the relay messages and commands for performance with Jackson
- Removes the dependency on Jackson's error classes across the codebase.
- Moves the hint to quote tag extension methods to their own packages.
- Speeds up the generation of Bech32 addresses
- Migrates NIP-6 and Blossom uploads to use Kotlin Serialization
Claude