[GR-34937] Fix core-string-equal benchmark to actually measure comparing bytes

PullRequest: truffleruby/3439

Author: eregon

bench/micro/string/equal.rb

@@ -13,21 +13,27 @@ def str(n)
   Array.new(n, 'a'.ord).pack('C*')
 end
 
+def are_equal?(a, b)
+  a == b
+end
+
 s1_small = str(small)
 s2_small = str(small)
 
 s1_large = str(large)
 s2_large = str(large)
 
-equal = s1_small == s2_small
-raise unless equal
-equal = s1_large == s2_large
-raise unless equal
+equal = false
+
+[[s1_small, s2_small], [s1_large, s2_large]].each do |a, b|
+  equal = are_equal?(a, b) # prevent splitting and identity caching
+  raise unless equal
+end
 
 benchmark "core-string-equal-#{small}" do
-  equal = s1_small == s2_small
+  equal = are_equal?(s1_small, s2_small)
 end
 
 benchmark "core-string-equal-#{large}" do
-  equal = s1_large == s2_large
+  equal = are_equal?(s1_large, s2_large)
 end

ci.jsonnet

@@ -692,7 +692,7 @@ local composition_environment = utils.add_inclusion_tracking(part_definitions, "
       "ruby-benchmarks-warmup-svm-graal-enterprise-multi-tier": shared + warmup + svm_configurations["svm-graal-enterprise"] + $.use.multi_tier,
       "ruby-benchmarks-warmup-svm-graal-enterprise-multi-tier-3threads": shared + warmup + svm_configurations["svm-graal-enterprise"] + $.use.multi_tier + $.use.three_threads,
 
-      local micro = $.benchmark.runner + $.benchmark.micro + { timelimit: "01:00:00" },
+      local micro = $.benchmark.runner + $.benchmark.micro + { timelimit: "01:30:00" },
       "ruby-benchmarks-micro-mri": shared + micro + other_rubies.mri,
       "ruby-benchmarks-micro-jruby": shared + micro + other_rubies.jruby,
       "ruby-benchmarks-micro-graal-core": shared + micro + graal_configurations["graal-core"] + $.use.no_multi_tier,