workloads: add memcpy workload

Ported memcpy workload from WA2.

wa/workloads/memcpy/__init__.py

@@ -0,0 +1,81 @@
+#    Copyright 2013-2015 ARM Limited
+#
+# Licensed 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.
+#
+
+# pylint: disable=E1101,W0201
+
+import os
+import re
+
+from wa import Workload, Parameter, Executable
+
+
+THIS_DIR = os.path.dirname(__file__)
+
+
+RESULT_REGEX = re.compile('Total time: ([\d.]+) s.*Bandwidth: ([\d.]+) MB/s', re.S)
+
+
+class Memcpy(Workload):
+
+    name = 'memcpy'
+    description = """
+    Runs memcpy in a loop.
+
+    This will run memcpy in a loop for a specified number of times on a buffer
+    of a specified size. Additionally, the affinity of the test can be set to
+    one or more specific cores.
+
+    This workload is single-threaded. It genrates no scores or metrics by
+    itself.
+
+    """
+
+    parameters = [
+        Parameter('buffer_size', kind=int, default=1024 * 1024 * 5,
+                  description='''
+                  Specifies the size, in bytes, of the buffer to be copied.
+                  '''),
+        Parameter('iterations', kind=int, default=1000,
+                  description='''
+                  Specfies the number of iterations that will be performed.
+                  '''),
+        Parameter('cpus', kind=list,
+                  description='''
+                  A list of integers specifying ordinals of cores to which the
+                  affinity of the test process should be set. If not specified,
+                  all avaiable cores will be used.
+                  '''),
+    ]
+
+    def initialize(self, context):
+        self.binary_name = 'memcpy'
+        resource = Executable(self, self.target.abi, self.binary_name)
+        host_binary = context.resolver.get(resource)
+        Memcpy.target_exe = self.target.install_if_needed(host_binary)
+
+    def setup(self, context):
+        self.command = '{} -i {} -s {}'.format(self.target_exe, self.iterations, self.buffer_size)
+        for c in (self.cpus or []):
+            self.command += ' -c {}'.format(c)
+        self.result = None
+
+    def run(self, context):
+        self.result = self.target.execute(self.command, timeout=300)
+
+    def extract_results(self, context):
+        if self.result:
+            match = RESULT_REGEX.search(self.result)
+            context.add_metric('time', float(match.group(1)), 'seconds', lower_is_better=True)
+            context.add_metric('bandwidth', float(match.group(2)), 'MB/s')