Fix memory check to work on other platforms - SC_PHYS_PAGES is not available on OS X or Windows

Author: rpep

fidimag/common/cuboid_mesh.py

@@ -27,7 +27,7 @@
 
 """
 from __future__ import print_function
-import os
+from psutil import virtual_memory
 import numpy as np
 from textwrap import dedent
 from six.moves import range
@@ -268,18 +268,20 @@ def check_size(self, system_memory_fake_for_testing=None):
 
         """
         bytes_per_float_numpy = 8
-        size_coordinates_bytes = self.nx * self.ny * self.nz * 3 * bytes_per_float_numpy
+        size_coordinates_bytes = self.nx * self.ny * \
+            self.nz * 3 * bytes_per_float_numpy
         size_coordinates_GiB = size_coordinates_bytes / (1024. ** 3)
 
         if system_memory_fake_for_testing is None:
-            mem_bytes = os.sysconf('SC_PAGE_SIZE') * os.sysconf('SC_PHYS_PAGES')
-            mem_GiB = mem_bytes / (1024. ** 3)
+            mem = virtual_memory() / (1024.0 ** 3)
         else:
             mem_GiB = system_memory_fake_for_testing
 
         if 2 * size_coordinates_GiB > mem_GiB:
             # print because no logging yet
-            print("Warning! Size of mesh coordinates i {} GiB.".format(size_coordinates_GiB))
-            print("You have {} GiB system memory. Possible halt.".format(mem_GiB))
+            print("Warning! Size of mesh coordinates i {} GiB.".format(
+                size_coordinates_GiB))
+            print(
+                "You have {} GiB system memory. Possible halt.".format(mem_GiB))
             return 1
         return 0