arch: make sure Device get thread config from host

devito/arch/archinfo.py

@@ -648,6 +648,10 @@ def numa_domains(self):
     def threads_per_core(self):
         return self.cores_logical // self.cores_physical
 
+    @property
+    def cores_physical_per_numa_domain(self):
+        return self.cores_physical // self.numa_domains
+
     @property
     def memtotal(self):
         """Physical memory size in bytes, or None if unknown."""
@@ -734,10 +738,6 @@ def numa_domains(self):
             warning("NUMA domain count autodetection failed")
             return 1
 
-    @property
-    def cores_physical_per_numa_domain(self):
-        return self.cores_physical // self.numa_domains
-
     @cached_property
     def memtotal(self):
         return psutil.virtual_memory().total
@@ -804,13 +804,15 @@ def _detect_isa(self):
 
 class Device(Platform):
 
-    def __init__(self, name, cores_logical=1, cores_physical=1, isa='cpp',
+    def __init__(self, name, cores_logical=None, cores_physical=None, isa='cpp',
                  max_threads_per_block=1024, max_threads_dimx=1024,
                  max_threads_dimy=1024, max_threads_dimz=64):
         super().__init__(name)
 
-        self.cores_logical = cores_logical
-        self.cores_physical = cores_physical
+        cpu_info = get_cpu_info()
+
+        self.cores_logical = cores_logical or cpu_info['logical']
+        self.cores_physical = cores_physical or cpu_info['physical']
         self.isa = isa
 
         self.max_threads_per_block = max_threads_per_block

tests/test_gpu_common.py

@@ -10,7 +10,7 @@
                     SubDimension, SubDomain, SubDomainSet, TimeFunction,
                     Operator, configuration, switchconfig, TensorTimeFunction,
                     Buffer)
-from devito.arch import get_gpu_info
+from devito.arch import get_gpu_info, get_cpu_info, Device, Cpu64
 from devito.exceptions import InvalidArgument
 from devito.ir import (Conditional, Expression, Section, FindNodes, FindSymbols,
                        retrieve_iteration_tree)
@@ -47,6 +47,15 @@ def custom_compiler(self):
             op.apply(time_M=10)
             assert np.all(u.data[1] == 11)
 
+    def test_host_threads():
+        plat = configuration['platform']
+
+        assert isinstance(plat, Device)
+
+        nth = plat.cores_physical
+        assert nth == get_cpu_info()['physical']
+        assert nth == Cpu64().cores_physical
+
 
 class TestCodeGeneration: