1 files changed, 55 insertions, 0 deletions
diff --git a/tools/dev/benchmarks/RepoPerf/ClearMemory.cpp b/tools/dev/benchmarks/RepoPerf/ClearMemory.cpp
new file mode 100644
index 0000000..06ef6f5
--- /dev/null
+++ b/tools/dev/benchmarks/RepoPerf/ClearMemory.cpp
@@ -0,0 +1,55 @@
+/* ClearMemory.cpp --- A simple Window memory cleaning tool
+ *
+ * ====================================================================
+ *    Licensed to the Apache Software Foundation (ASF) under one
+ *    or more contributor license agreements.  See the NOTICE file
+ *    distributed with this work for additional information
+ *    regarding copyright ownership.  The ASF licenses this file
+ *    to you under the Apache License, Version 2.0 (the
+ *    "License"); you may not use this file except in compliance
+ *    with the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing,
+ *    software distributed under the License is distributed on an
+ *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *    KIND, either express or implied.  See the License for the
+ *    specific language governing permissions and limitations
+ *    under the License.
+ * ====================================================================
+ */
+
+#include "targetver.h"
+
+#include <Windows.h>
+
+#include <stdio.h>
+#include <tchar.h>
+
+int _tmain(int argc, _TCHAR* argv[])
+{
+  // Get the current memory usage stats
+  MEMORYSTATUSEX statex;
+  statex.dwLength = sizeof (statex);
+  GlobalMemoryStatusEx(&statex);
+
+  // (Clean) cache memory will be listed under "available".
+  // So, allocate all available RAM, touch it and release it again.
+  unsigned char *memory = new unsigned char[statex.ullAvailPhys];
+  if (memory)
+    {
+      // Make every page dirty.
+      for (DWORDLONG i = 0; i < statex.ullAvailPhys; i += 4096)
+        memory[i]++;
+
+      // Give everything back to the OS.
+      // The in-RAM file read cache is empty now. There may still be bits in
+      // the swap file as well as dirty write buffers.  But we don't care
+      // much about these here ...
+      delete memory;
+    }
+
+  return 0;
+}
+