avocado.tests: Port stress test from autotest

Add new 'stress' test based on autotest.
Signed-off-by: NAmador Pahim <apahim@redhat.com>

avocado/utils/disk.py

+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# See LICENSE for more details.
+#
+# This code was inspired in the autotest project,
+#
+# client/base_utils.py
+
+
+"""
+Disk utilities
+"""
+
+import os
+
+
+def freespace(path):
+    fs_stats = os.statvfs(path)
+    return fs_stats.f_bsize * fs_stats.f_bavail

examples/tests/stress.py

+#!/usr/bin/env python
+
+import os
+import multiprocessing
+
+from avocado import Test
+from avocado import main
+from avocado.utils import archive
+from avocado.utils import disk
+from avocado.utils import build
+from avocado.utils import memory
+from avocado.utils import process
+
+
+class Stress(Test):
+
+    """
+    Calls stress, a simple program which aims to impose certain types of
+    computing stress on the target machine.
+    @author: Yi Yang (yang.y.yi@gmail.com)
+    """
+
+    def setUp(self):
+        """
+        Build 'stress'.
+        Source:
+         http://people.seas.harvard.edu/~apw/stress/stress-1.0.4.tar.gz
+        """
+        stress_tarball = self.params.get('stress_tarball',
+                                         default='stress-1.0.4.tar.gz')
+        tarball_path = self.get_data_path(stress_tarball)
+        archive.extract(tarball_path, self.srcdir)
+        stress_version = stress_tarball.split('.tar.')[0]
+        self.srcdir = os.path.join(self.srcdir, stress_version)
+        os.chdir(self.srcdir)
+        process.run('./configure')
+        build.make(self.srcdir)
+
+    def test(self):
+        """
+        Execute 'stress' with proper arguments.
+        """
+        length = self.params.get('stress_lenght', default=60)
+        threads = self.params.get('threads', default=None)
+        memory_per_thread = self.params.get('memory_per_thread', default=None)
+        file_size_per_thread = self.params.get('file_size_per_thread',
+                                               default=None)
+        if threads is None:
+            # We will use 2 workers of each type for each CPU detected
+            threads = 2 * multiprocessing.cpu_count()
+
+        if memory_per_thread is None:
+            # Sometimes the default memory used by each memory worker (256 M)
+            # might make our machine go OOM and then funny things might start to
+            # happen. Let's avoid that.
+            mb = (memory.freememtotal() +
+                  memory.read_from_meminfo('SwapFree') / 2)
+            memory_per_thread = (mb * 1024) / threads
+
+        if file_size_per_thread is None:
+            # Even though unlikely, it's good to prevent from allocating more
+            # disk than this machine actually has on its autotest directory
+            # (limit the amount of disk used to max of 90 % of free space)
+            free_disk = disk.freespace(self.srcdir)
+            file_size_per_thread = 1024 ** 2
+            if (0.9 * free_disk) < file_size_per_thread * threads:
+                file_size_per_thread = (0.9 * free_disk) / threads
+
+        # Number of CPU workers spinning on sqrt()
+        args = '--cpu %d ' % threads
+        # Number of IO workers spinning on sync()
+        args += '--io %d ' % threads
+        # Number of Memory workers spinning on malloc()/free()
+        args += '--vm %d ' % threads
+        # Amount of memory used per each worker
+        args += '--vm-bytes %d ' % memory_per_thread
+        # Number of HD workers spinning on write()/ulink()
+        args += '--hdd %d ' % threads
+        # Size of the files created by each worker in bytes
+        args += '--hdd-bytes %d ' % file_size_per_thread
+        # Time for which the stress test will run
+        args += '--timeout %d ' % length
+        # Verbose flag
+        args += '--verbose'
+
+        os.chdir(self.srcdir)
+        cmd = ('./src/stress %s' % args)
+        process.run(cmd)
+
+if __name__ == "__main__":
+    main()

examples/tests/stress.py.data/stress.yaml

+setup:
+    duration: !mux
+        default:
+            stress_lenght: 60
+        quick:
+            stress_lenght: 5
+    workers: !mux
+        default:
+            threads: null
+        minimal:
+            threads: 1
+    memory:
+        memory_per_thread: null
+    files:
+        file_size_per_thread: null