Build harness arguments once during initialization

Author: rafaelfranca

lib/benchmark_suite.rb

@@ -33,6 +33,7 @@ def initialize(categories:, name_filters:, excludes: [], out_path:, harness:, pr
     @ractor_only = (categories == RACTOR_ONLY_CATEGORY)
 
     setup_benchmark_directories
+    @harness_args = build_harness_args
   end
 
   # Run all the benchmarks and record execution times
@@ -63,6 +64,8 @@ def run(ruby:, ruby_description:)
 
   private
 
+  attr_reader :harness_args
+
   def setup_benchmark_directories
     if @ractor_only
       @bench_dir = RACTOR_BENCHMARKS_DIR
@@ -151,15 +154,6 @@ def run_single_benchmark(script_path, result_json_path, ruby, cmd_prefix, env)
     ENV["RESULT_JSON_PATH"] = result_json_path
 
     # Set up the benchmarking command
-    # If harness is 'default', use default (no -r needed)
-    # Otherwise use -r to load the specific harness file with full path
-    harness_args = if harness == "default"
-      []
-    else
-      harness_path = File.join(HARNESS_DIR, harness)
-      ["-r", harness_path]
-    end
-
     cmd = cmd_prefix + [
       *ruby,
       *harness_args,
@@ -236,6 +230,17 @@ def setarch_prefix
     prefix
   end
 
+  # If harness is 'default', use default (no -r needed)
+  # Otherwise use -r to load the specific harness file with full path
+  def build_harness_args
+    if harness == "default"
+      []
+    else
+      harness_path = File.join(HARNESS_DIR, harness)
+      ["-r", harness_path]
+    end
+  end
+
   # Resolve the pre_init file path into a form that can be required
   def expand_pre_init(path)
     path = Pathname.new(path)