Merge pull request avocado-framework-tests#2768 from disgoel/psutil-r…

…eadme

fix tear down and add readme file

perf/perf_stress_ng.py

@@ -243,10 +243,9 @@ def tearDown(self):
         removes the log files and collects the dmesg data
         :param: none
         """
-
-        file_name = "rm -rf /tmp/stdout /tmp/stderr /tmp/data* /tmp/stressng_output*"
-        try:
-            os.remove(file_name)
-        except OSError:
-            self.log.warn("Files do not exist")
+        files_to_remove = ["/tmp/stdout", "/tmp/stderr", "/tmp/data*",
+                           "/tmp/stressng_output*"]
+        for file_path in files_to_remove:
+            if os.path.exists(file_path):
+                os.remove(file_path)
         dmesg.collect_dmesg()

perf/perf_stress_ng.py.data/README.txt

@@ -0,0 +1,16 @@
+Description:
+This test is to compare CPU load percentage from vmstat and perf
+command by running stress-ng in background.
+The test collects vmstat and perf record data with CPU load
+10, 50 and 80 by running it for 5 iterations.
+
+Steps followed:
+Run stress-ng in background with CPU load 10, 50 and 80.
+Run perf record to collect CPU load for 5 iterations.
+Run vmstat to collect CPU load for 5 iterations.
+Compare both results.
+
+Pre-requisite:
+1. Install psutil using pip
+   # pip3 install psutil
+2. Install perf, gcc and stress-ng packages