changed the benchmark to use different counts of threads

benchmark/search_bench.rb

@@ -4,6 +4,21 @@ require 'benchmark'
 require 'virtus'
 require 'polecat'
 
+n = 2500
+
+def run_threads threadcount, count, searcher, query
+  threads = []
+  count = count / threadcount
+  threadcount.times do
+    threads << Thread.new do
+      for i in 1..count do
+        searcher.search query
+      end
+    end
+  end
+  threads.each {|t| t.join }
+end
+
 class Document
   include Virtus
 
@@ -26,10 +41,9 @@ writer.write
 searcher = Polecat::IndexSearcher.new :reader => writer.create_reader
 query = Polecat::Query.new.add(Polecat::Term.new(:name, :lt, 25000))
 
-puts Benchmark.bm { |x|
-  x.report('search') {
-    for i in 1..5000 do
-      searcher.search query
-    end
-  }
-}
+Benchmark.bm do |x|
+  x.report('1') { run_threads 1, n, searcher, query.dup }
+  x.report('2') { run_threads 1, n, searcher, query.dup }
+  x.report('4') { run_threads 1, n, searcher, query.dup }
+  x.report('8') { run_threads 1, n, searcher, query.dup }
+end