1 files changed, 124 insertions, 0 deletions
diff --git a/tools/load_gen/stress/stress.py b/tools/load_gen/stress/stress.py
new file mode 100644
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+++ b/tools/load_gen/stress/stress.py
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+# Copyright 2015 Intel Corporation.
+#
+# 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.
+
+"""Module with implementation of wrapper around the stress tool
+"""
+
+import logging
+import subprocess
+import copy
+from tools import tasks
+from tools import systeminfo
+from tools.load_gen.load_gen import ILoadGenerator
+
+class Stress(ILoadGenerator):
+    """Wrapper around stress tool, which generates load based on testcase
+    configuration parameter 'load'
+    """
+    _process_args = {
+        'cmd': ['sudo', 'stress'],
+        'timeout': 5,
+        'logfile': '/tmp/stress.log',
+        'expect': r'stress: info:',
+        'name': 'stress'
+    }
+    _logger = logging.getLogger(__name__)
+
+    def __init__(self, stress_config):
+        self._running = False
+        # copy stress process setings before its modification
+        process_args = copy.deepcopy(self._process_args)
+        # check if load is requested and correctly configured
+        if not (stress_config and 'load' in stress_config and
+                'pattern' in stress_config and stress_config['load'] > 0):
+            self._logger.error('stress test is not enabled')
+            return
+
+        if stress_config['load'] < 0 or stress_config['load'] > 100:
+            self._logger.error('defined load %s is out of range 0-100',
+                               stress_config['load'])
+            return
+
+        # check if load tool binary is available
+        if not ('tool' in stress_config) or subprocess.call("which " + stress_config['tool'], shell=True) > 0:
+            self._logger.error("stress tool binary '%s' is not available", stress_config['tool'])
+            return
+
+        # calculate requested load details and load split among different
+        # types of workers
+        cpus = systeminfo.get_cpu_cores()
+        if 'reserved' in stress_config:
+            cpus = cpus - int(stress_config['reserved'])
+            if cpus < 1:
+                cpus = 1
+
+        workers = round(cpus/100 * int(stress_config['load']))
+        cmd_dict = {}
+        p_types = {}
+        p_total = 0
+        for p_type in ('c', 'i', 'm'):
+            p_count = stress_config['pattern'].lower().count(p_type)
+            if p_count > 0:
+                p_types[p_type] = p_count
+                p_total += p_count
+        if p_total < 1:
+            self._logger.error('stress test pattern does not contain any of ' \
+                               'c, i or m pattern types')
+            return
+        for p_type in p_types:
+            cmd_dict['-'+p_type] = round(workers* p_types[p_type] / p_total)
+
+        # check for memory load in case that memory workers are detected
+        # in case of error or 0%, memory size is not specified and default
+        # amount of memory will be used by stress tool
+        if '-m' in cmd_dict and cmd_dict['-m'] > 0:
+            if 'load_memory' in stress_config and \
+                stress_config['load_memory'] > 0 and \
+                stress_config['load_memory'] <= 100:
+
+                mem = systeminfo.get_memory_bytes()
+                if mem:
+                    cmd_dict['--vm-bytes'] = round(int(mem) / 100 * \
+                        stress_config['load_memory'] / cmd_dict['-m'])
+
+        # append stress arguments to cmd list used by parent class Process
+        for key, value in cmd_dict.items():
+            process_args['cmd'].append(key)
+            process_args['cmd'].append(str(value))
+
+        # append load generator options if specified
+        if 'options' in stress_config:
+            process_args['cmd'].append(stress_config['options'])
+
+        # initialize load generator and remember it
+        super(Stress, self).__init__(**process_args)
+        self._running = True
+
+    def start(self):
+        """Start stress load if it was requested
+        """
+        if self._running:
+            super(Stress, self).start()
+
+    def kill(self):
+        """
+        Kill stress load if it is active
+        """
+        if self._running and self._child and self._child.isalive():
+            tasks.run_task(['sudo', 'pkill', self._proc_name],
+                           self._logger)
+
+        self._logger.info(
+            'Log available at %s', self._logfile)
+        self._running = False