3 files changed, 62 insertions, 18 deletions
diff --git a/benchmark/bm_vm3_thread_mutex1.rb b/benchmark/bm_vm3_thread_mutex1.rb
new file mode 100644
index 0000000000..d1ba792291
--- /dev/null
+++ b/benchmark/bm_vm3_thread_mutex1.rb
@@ -0,0 +1,21 @@
+# one thread, one mutex (no contention)
+
+require 'thread'
+m = Mutex.new
+r = 0
+max = 1000
+lmax = max * max
+(1..1).map{
+  Thread.new{
+    i=0
+    while i<lmax
+      i+=1
+      m.synchronize{
+        r += 1
+      }
+    end
+  }
+}.each{|e|
+  e.join
+}
+raise r.to_s if r != max * max
diff --git a/benchmark/bm_vm3_thread_mutex2.rb b/benchmark/bm_vm3_thread_mutex2.rb
new file mode 100644
index 0000000000..2903845c3e
--- /dev/null
+++ b/benchmark/bm_vm3_thread_mutex2.rb
@@ -0,0 +1,21 @@
+# two threads, one mutex
+
+require 'thread'
+m = Mutex.new
+r = 0
+max = 1000
+lmax = (max * max)/2
+(1..2).map{
+  Thread.new{
+    i=0
+    while i<lmax
+      i+=1
+      m.synchronize{
+        r += 1
+      }
+    end
+  }
+}.each{|e|
+  e.join
+}
+raise r.to_s if r != max * max
diff --git a/benchmark/bm_vm3_thread_mutex.rb b/benchmark/bm_vm3_thread_mutex3.rb
index 649f1fddac..888ae8eaad 100644
--- a/benchmark/bm_vm3_thread_mutex.rb
+++ b/benchmark/bm_vm3_thread_mutex3.rb
@@ -1,18 +1,20 @@
-require 'thread'
-m = Mutex.new
-r = 0
-max = 1000
-(1..max).map{
-  Thread.new{
-    i=0
-    while i<max
-      i+=1
-      m.synchronize{
-        r += 1
-      }
-    end
-  }
-}.each{|e|
-  e.join
-}
-raise r.to_s if r != max * max
+# 1000 threads, one mutex
+
+require 'thread'
+m = Mutex.new
+r = 0
+max = 1000
+(1..max).map{
+  Thread.new{
+    i=0
+    while i<max
+      i+=1
+      m.synchronize{
+        r += 1
+      }
+    end
+  }
+}.each{|e|
+  e.join
+}
+raise r.to_s if r != max * max