PyAuto test for GPU memory consumption

chrome/test/functional/gpu_mem.py

+#!/usr/bin/env python
+# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import pyauto_functional
+import pyauto
+
+class GpuMemTest(pyauto.PyUITest):
+  # Return the number of bytes of GPU memory being used
+  def _getGpuMemUsage(self):
+    gpuMemStats = self.GetGpuMemStats()
+    if gpuMemStats['gpu_active'] == False:
+      self.fail(msg='GPU process not active.')
+    return gpuMemStats['gpu_memory_bytes_used']
+
+  def testSanity(self):
+    """Report GPU memory usage when test page with 3D CSS is open."""
+    url_3dcss = self.GetFileURLForDataPath('gpu/mem_3dcss.html')
+    self.NavigateToURL(url_3dcss, 0)
+    print 'Using ', self._getGpuMemUsage(), ' bytes of GPU memory'
+
+  def testOverSubscribe(self):
+    """Over-subscribe GPU memory."""
+    url_3dcss = self.GetFileURLForDataPath('gpu/mem_3dcss.html')
+    # Let tabs_to_open be the number of instances of mem_3dcss.html that
+    # will oversubscribe all available GPU memory by a factor of 4
+    # TODO - compute this reliably -- this is a wild guess
+    tabs_to_open = 2
+    # Record memory usage statistics as each new tab is opened
+    for i in xrange(tabs_to_open):
+      self.AppendTab(url_3dcss, windex=0)
+    # TODO - verify that we never exceeded the GPU memory budget
+    # TODO - verify that we actually used 'most' of the GPU memory (say,
+    #        half of it), and that the GPU memory manager did kick
+    #        around some resources
+    print 'Using ', self._getGpuMemUsage(), ' bytes of GPU memory'
+
+if __name__ == '__main__':
+  pyauto_functional.Main()