Update run_benchmarks.rb to pass the JSON to render_graph (#342)

* Update run_benchmarks.rb to pass the JSON to render_graph

* Check that --graph works in CI

Author: eregon

.github/workflows/test.yml

@@ -40,6 +40,14 @@ jobs:
           MIN_BENCH_TIME: '0'
           SKIP_BENCHMARKS: ${{ matrix.skip }}
 
+      - name: Test run_benchmarks.rb --graph
+        run: ./run_benchmarks.rb --graph fib
+        if: matrix.ruby == 'ruby'
+        env:
+          WARMUP_ITRS: '1'
+          MIN_BENCH_ITRS: '1'
+          MIN_BENCH_TIME: '0'
+
       - name: Test run_once.sh
         run: ./run_once.sh --yjit-stats benchmarks/railsbench/benchmark.rb
         if: matrix.ruby == 'head'

run_benchmarks.rb

@@ -588,14 +588,14 @@ def run_benchmarks(ruby:, ruby_description:, categories:, name_filters:, out_pat
 # Print the table to the console, with numbers truncated
 puts(output_str)
 
-# Print CSV and PNG file names
+# Print JSON and PNG file names
 puts
 puts "Output:"
 puts out_json_path
 if args.graph
   require_relative 'misc/graph'
   out_graph_path = output_path + ".png"
-  render_graph(out_tbl_path, out_graph_path)
+  render_graph(out_json_path, out_graph_path)
   puts out_graph_path
 end