Benchmarks: provide reports to simplify the code for statistical analysis.

spec/benchmark-cars.cr

@@ -29,6 +29,18 @@ class Context
 	class_property incr        = 1_000
 end
 
+# To simplify the creation of graphs, it's better to have fake data for
+# partitions and tags that won't be actually covered.
+# 0 means the absence of data.
+def fake_report(name)
+	durations = Array(Int32).new Context.nb_run, 0
+	File.open("#{Context.report_dir}/#{name}.raw", "w") do |file|
+		durations.each do |d|
+			file.puts d
+		end
+	end
+	puts "#{name}: no report"
+end
 def report(storage, name, &block)
 	durations = run_n_times Context.nb_run, &block
 	File.open("#{Context.report_dir}/#{name}.raw", "w") do |file|
@@ -98,12 +110,17 @@ def batch()
 		report(storage, "#{name}_#{current_db_size}_index") do
 			corvet = search_name.get name_to_search
 		end
+		if current_db_size <= Context.max_indexes
 			report(storage, "#{name}_#{current_db_size}_partitions") do
 				corvet = search_color.get? color_to_search
 			end
 			report(storage, "#{name}_#{current_db_size}_tags") do
 				corvet = search_keywords.get? keyword_to_search
 			end
+		else
+			fake_report("#{name}_#{current_db_size}_partitions")
+			fake_report("#{name}_#{current_db_size}_tags")
+		end
 	}
 
 	prepare_env cars_cached,   "cached",   cached_Sby_name, cached_Sby_color, cached_Sby_keywords, &fn