Update check_ready_to_run in windows local mode (#1025)

* Update mnist-hyperband.test.yml

* Fix system node

* Fix pgrep in windows

tools/nni_gpu_tool/gpu_metrics_collector.py

@@ -25,15 +25,20 @@
 from xml.dom import minidom
 
 def check_ready_to_run():
-    #TODO check process in windows
     if sys.platform == 'win32':
-        return True
-    pgrep_output =subprocess.check_output('pgrep -fx \'python3 -m nni_gpu_tool.gpu_metrics_collector\'', shell=True)
-    pidList = []
-    for pid in pgrep_output.splitlines():
-        pidList.append(int(pid))
-    pidList.remove(os.getpid())
-    return len(pidList) == 0
+        pgrep_output = subprocess.check_output('wmic process where "CommandLine like \'%nni_gpu_tool.gpu_metrics_collector%\' and name like \'%python%\'" get processId')
+        pidList = pgrep_output.decode("utf-8").strip().split()
+        pidList.pop(0) # remove the key word 'ProcessId'
+        pidList = list(map(int, pidList))
+        pidList.remove(os.getpid())
+        return len(pidList) == 0
+    else:
+        pgrep_output =subprocess.check_output('pgrep -fx \'python3 -m nni_gpu_tool.gpu_metrics_collector\'', shell=True)
+        pidList = []
+        for pid in pgrep_output.splitlines():
+            pidList.append(int(pid))
+        pidList.remove(os.getpid())
+        return len(pidList) == 0
 
 def main(argv):
     metrics_output_dir = os.environ['METRIC_OUTPUT_DIR']