[core] stats: minor simplification

add timeout on nvidia-smi
add try/except
remove duplicated code
no error is no nvidia-smi available

meshroom/core/stats.py

@@ -44,7 +44,7 @@ def __init__(self):
         self.gpuMemoryTotal = 0
         self.gpuName = ''
         self.curves = defaultdict(list)
-
+        self.nvidia_smi = None
         self._isInit = False
 
     def initOnFirstTime(self):
@@ -53,40 +53,21 @@ def initOnFirstTime(self):
         self._isInit = True
 
         self.cpuFreq = psutil.cpu_freq().max
-        self.ramTotal = psutil.virtual_memory().total / 1024/1024/1024
+        self.ramTotal = psutil.virtual_memory().total / (1024*1024*1024)
 
         if platform.system() == "Windows":
             from distutils import spawn
             # If the platform is Windows and nvidia-smi
-            # could not be found from the environment path,
-            # try to find it from system drive with default installation path
             self.nvidia_smi = spawn.find_executable('nvidia-smi')
             if self.nvidia_smi is None:
-                self.nvidia_smi = "%s\\Program Files\\NVIDIA Corporation\\NVSMI\\nvidia-smi.exe" % os.environ['systemdrive']
+                # could not be found from the environment path,
+                # try to find it from system drive with default installation path
+                default_nvidia_smi = "%s\\Program Files\\NVIDIA Corporation\\NVSMI\\nvidia-smi.exe" % os.environ['systemdrive']
+                if os.path.isfile(default_nvidia_smi):
+                    self.nvidia_smi = default_nvidia_smi
         else:
             self.nvidia_smi = "nvidia-smi"
 
-        try:
-            p = subprocess.Popen([self.nvidia_smi, "-q", "-x"], stdout=subprocess.PIPE)
-            xmlGpu, stdError = p.communicate()
-
-            smiTree = ET.fromstring(xmlGpu)
-            gpuTree = smiTree.find('gpu')
-
-            try:
-                self.gpuMemoryTotal = gpuTree.find('fb_memory_usage').find('total').text.split(" ")[0]
-            except Exception as e:
-                logging.debug('Failed to get gpuMemoryTotal: "{}".'.format(str(e)))
-                pass
-            try:
-                self.gpuName = gpuTree.find('product_name').text
-            except Exception as e:
-                logging.debug('Failed to get gpuName: "{}".'.format(str(e)))
-                pass
-
-        except Exception as e:
-            logging.debug('Failed to get information from nvidia_smi at init: "{}".'.format(str(e)))
-
     def _addKV(self, k, v):
         if isinstance(v, tuple):
             for ki, vi in v._asdict().items():
@@ -98,18 +79,23 @@ def _addKV(self, k, v):
             self.curves[k].append(v)
 
     def update(self):
-        self.initOnFirstTime()
-        self._addKV('cpuUsage', psutil.cpu_percent(percpu=True)) # interval=None => non-blocking (percentage since last call)
-        self._addKV('ramUsage', psutil.virtual_memory().percent)
-        self._addKV('swapUsage', psutil.swap_memory().percent)
-        self._addKV('vramUsage', 0)
-        self._addKV('ioCounters', psutil.disk_io_counters())
-        self.updateGpu()
+        try:
+            self.initOnFirstTime()
+            self._addKV('cpuUsage', psutil.cpu_percent(percpu=True)) # interval=None => non-blocking (percentage since last call)
+            self._addKV('ramUsage', psutil.virtual_memory().percent)
+            self._addKV('swapUsage', psutil.swap_memory().percent)
+            self._addKV('vramUsage', 0)
+            self._addKV('ioCounters', psutil.disk_io_counters())
+            self.updateGpu()
+        except Exception as e:
+            logging.debug('Failed to get statistics: "{}".'.format(str(e)))
 
     def updateGpu(self):
+        if not self.nvidia_smi:
+            return
         try:
-            p = subprocess.Popen([self.nvidia_smi, "-q", "-x"], stdout=subprocess.PIPE)
-            xmlGpu, stdError = p.communicate()
+            p = subprocess.Popen([self.nvidia_smi, "-q", "-x"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+            xmlGpu, stdError = p.communicate(timeout=10) # 10 seconds
 
             smiTree = ET.fromstring(xmlGpu)
             gpuTree = smiTree.find('gpu')
@@ -129,7 +115,11 @@ def updateGpu(self):
             except Exception as e:
                 logging.debug('Failed to get gpuTemperature: "{}".'.format(str(e)))
                 pass
-
+        except subprocess.TimeoutExpired as e:
+            logging.debug('Timeout when retrieving information from nvidia_smi: "{}".'.format(str(e)))
+            p.kill()
+            outs, errs = p.communicate()
+            return
         except Exception as e:
             logging.debug('Failed to get information from nvidia_smi: "{}".'.format(str(e)))
             return