auto detect cpu avx instruction set

python/paddle_serving_server/server.py

@@ -330,12 +330,21 @@ class Server(object):
     def use_mkl(self, flag):
         self.mkl_flag = flag
 
+    def check_avx(self):
+        p = subprocess.Popen(['cat /proc/cpuinfo | grep avx 2>/dev/null'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
+        out, err = p.communicate()
+        if err == '' and len(out) > 0:
+            return True
+        else:
+            return False
+
     def get_device_version(self):
         avx_flag = False
-        mkl_flag = self.mkl_flag
-        r = os.system("cat /proc/cpuinfo | grep avx > /dev/null 2>&1")
-        if r == 0:
+        avx_support = self.check_avx()
+        if avx_suppport:
             avx_flag = True
+            self.use_mkl(True)
+        mkl_flag = self.mkl_flag
         if avx_flag:
             if mkl_flag:
                 device_version = "cpu-avx-mkl"