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build: enhance JVM options for improved performance in development and CI environments
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‎flake.nix‎

Lines changed: 93 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -38,10 +38,66 @@
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let
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jdk = pkgs.openjdk23;
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sbt = pkgs.sbt.override { jre = jdk; };
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visualvm = pkgs.visualvm.override { jdk = jdk; };
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# Common JVM options for both app and sbt JVM
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commonJvmOpts = [
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# Memory settings - large heap for Scala compilation and IR processing
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# "-Xmx12G" # Maximum heap size
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"-Xms4G" # Initial heap size (reduces early GC pressure)
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"-Xss64m" # Stack size for deep recursive calls in compiler
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# Enable experimental features for Java 23
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"-XX:+UnlockExperimentalVMOptions" # Allow use of experimental VM options
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# Garbage Collection - ZGC for ultra-low latency
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"-XX:+UseZGC" # Use Z Garbage Collector (concurrent, low-latency)
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# Memory optimizations
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"-XX:+UseStringDeduplication" # Deduplicate identical strings to save memory
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"-XX:+OptimizeStringConcat" # Optimize string concatenation operations
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# Code cache settings for better JIT performance
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"-XX:ReservedCodeCacheSize=512m" # Reserve more space for compiled native code
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"-XX:InitialCodeCacheSize=64m" # Start with larger initial code cache
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# Compilation settings
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"-XX:+TieredCompilation" # Use tiered compilation (C1 + C2 compilers)
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# Memory efficiency
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"-XX:+UseCompressedOops" # Use 32-bit pointers on 64-bit JVM (saves memory)
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"-XX:+UseCompressedClassPointers" # Compress class metadata pointers
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# Java 23 preview features
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"--enable-preview" # Enable preview language features
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] ++ pkgs.lib.optionals pkgs.stdenv.isLinux [
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# Linux-specific optimizations (not available on macOS)
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"-XX:+UseTransparentHugePages" # Use OS huge pages for better memory performance
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];
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# App-specific JVM options (runtime performance focused)
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appJvmOpts = commonJvmOpts ++ [
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# JIT compiler optimizations for better runtime performance
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"-XX:MaxInlineLevel=15" # Allow deeper method inlining (Scala benefits from this)
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"-XX:MaxInlineSize=270" # Allow larger methods to be inlined
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"-XX:CompileThreshold=1000" # Compile methods to native code after 1000 invocations
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];
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# SBT-specific JVM options (optimized for faster startup)
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sbtJvmOpts = commonJvmOpts ++ [
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# Startup optimization - prioritize fast startup over peak performance
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"-XX:TieredStopAtLevel=1" # Stop at C1 compiler (faster startup, less optimization)
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"-XX:CompileThreshold=1500" # Higher threshold for native compilation (faster startup)
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# SBT-specific optimizations
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"-Dsbt.boot.lock=false" # Disable boot lock file (faster concurrent sbt instances)
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"-Dsbt.cached.resolution.cache.limit=50" # Limit dependency resolution cache size
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];
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in
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pkgs.mkShell {
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JAVA_HOME = "${jdk}";
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JAVA_OPTS = "-Xmx4g -Xss512m -XX:+UseG1GC";
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JAVA_OPTS = builtins.concatStringsSep " " appJvmOpts;
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SBT_OPTS = builtins.concatStringsSep " " sbtJvmOpts;
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CARGO_NET_GIT_FETCH_WITH_CLI = "true";
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CARGO_REGISTRIES_CRATES_IO_PROTOCOL = "sparse";
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# Fixes issues with Node.js 20+ and OpenSSL 3 during webpack build
@@ -90,10 +146,45 @@
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let
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jdk = pkgs.openjdk11;
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sbt = pkgs.sbt.override { jre = jdk; };
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# Common JVM options for CI environment (Java 11 - more conservative settings)
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ciCommonJvmOpts = [
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# Conservative memory settings for CI environments
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"-Xmx12G" # Maximum heap size (smaller than dev for CI resource limits)
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"-Xms2G" # Initial heap size (conservative for CI)
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"-Xss64m" # Stack size for deep recursive calls in compiler
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# Garbage Collection - G1GC for Java 11 stability
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"-XX:+UseG1GC" # Use G1 Garbage Collector (stable, good for large heaps)
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# Memory optimizations (Java 11 compatible)
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"-XX:+UseStringDeduplication" # Deduplicate identical strings to save memory
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# Code cache settings
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# "-XX:ReservedCodeCacheSize=512m" # Reserve space for compiled native code
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# "-XX:InitialCodeCacheSize=64m" # Start with larger initial code cache
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# Compilation settings
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# "-XX:+TieredCompilation" # Use tiered compilation (C1 + C2 compilers)
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# Memory efficiency
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"-XX:+UseCompressedOops" # Use 32-bit pointers on 64-bit JVM (saves memory)
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];
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# CI SBT-specific options (prioritize build speed and reliability)
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ciSbtJvmOpts = ciCommonJvmOpts ++ [
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# Fast startup for CI builds
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"-XX:TieredStopAtLevel=1" # Stop at C1 compiler (faster CI startup)
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"-XX:CompileThreshold=1500" # Higher threshold for native compilation
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# CI-specific optimizations
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"-Dsbt.boot.lock=false" # Disable boot lock (faster in containerized CI)
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];
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in
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pkgs.mkShell {
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JAVA_HOME = "${jdk}";
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JAVA_OPTS = "-Xmx4g -Xss512m -XX:+UseG1GC";
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JAVA_OPTS = builtins.concatStringsSep " " ciCommonJvmOpts;
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SBT_OPTS = builtins.concatStringsSep " " ciSbtJvmOpts;
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CARGO_NET_GIT_FETCH_WITH_CLI = "true";
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CARGO_REGISTRIES_CRATES_IO_PROTOCOL = "sparse";
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# Fixes issues with Node.js 20+ and OpenSSL 3 during webpack build
@@ -115,7 +206,6 @@
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ln -s ${plutus}/plutus-conformance plutus-conformance
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export LIBRARY_PATH="${tiny_keccak_wrapper}/lib:${pkgs.secp256k1}/lib:${pkgs.libsodium}/lib:$LIBRARY_PATH"
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export LD_LIBRARY_PATH="${tiny_keccak_wrapper}/lib:${pkgs.secp256k1}/lib:${pkgs.libsodium}/lib:$LD_LIBRARY_PATH"
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export SBT_OPTS="-Xss64m $SBT_OPTS"
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'';
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};
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};

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