Avoid creating SyclDevice from filter_string

numba_dpex/core/types/usm_ndarray_type.py

@@ -31,48 +31,53 @@ def __init__(
         aligned=True,
         addrspace=address_space.GLOBAL,
     ):
+        # Creating SyclDevice from filter_string is expensive. So, USMNdArray should be able to
+        # accept and SyclDevice from usm_ndarray as device parameter
+        if not isinstance(device, (str, dpctl.SyclDevice)):
+            raise TypeError(
+                "The device keyword arg should be a str object specifying "
+                "a SYCL filter selector"
+            )
+
+        if not isinstance(queue, dpctl.SyclQueue) and queue is not None:
+            raise TypeError(
+                "The queue keyword arg should be a dpctl.SyclQueue object or None"
+            )
+
         self.usm_type = usm_type
         self.addrspace = addrspace
 
-        if queue is not None and device != "unknown":
-            if not isinstance(device, str):
-                raise TypeError(
-                    "The device keyword arg should be a str object specifying "
-                    "a SYCL filter selector"
-                )
-            if not isinstance(queue, dpctl.SyclQueue):
-                raise TypeError(
-                    "The queue keyword arg should be a dpctl.SyclQueue object"
-                )
-            d1 = queue.sycl_device
-            d2 = dpctl.SyclDevice(device)
-            if d1 != d2:
-                raise TypeError(
-                    "The queue keyword arg and the device keyword arg specify "
-                    "different SYCL devices"
-                )
+        def to_device(dev):
+            if isinstance(dev, dpctl.SyclDevice):
+                return dev
+
+            return dpctl.SyclDevice(dev)
+
+        def device_as_string(dev):
+            if isinstance(dev, dpctl.SyclDevice):
+                return dev.filter_string
+
+            return dev
+
+        if queue is not None:
+            if device != "unknown":
+                if queue.sycl_device != to_device(device):
+                    raise TypeError(
+                        "The queue keyword arg and the device keyword arg specify "
+                        "different SYCL devices"
+                    )
+
             self.queue = queue
-            self.device = device
-        elif queue is None and device != "unknown":
-            if not isinstance(device, str):
-                raise TypeError(
-                    "The device keyword arg should be a str object specifying "
-                    "a SYCL filter selector"
-                )
+        else:
+            if device == "unknown":
+                device = None
+
+            device_str = device_as_string(device)
             self.queue = dpctl.tensor._device.normalize_queue_device(
-                device=device
+                device=device_str
             )
-            self.device = device
-        elif queue is not None and device == "unknown":
-            if not isinstance(queue, dpctl.SyclQueue):
-                raise TypeError(
-                    "The queue keyword arg should be a dpctl.SyclQueue object"
-                )
-            self.device = self.queue.sycl_device.filter_string
-            self.queue = queue
-        else:
-            self.queue = dpctl.tensor._device.normalize_queue_device()
-            self.device = self.queue.sycl_device.filter_string
+
+        self.device = self.queue.sycl_device.filter_string
 
         if not dtype:
             dummy_tensor = dpctl.tensor.empty(

numba_dpex/core/typing/typeof.py

@@ -43,7 +43,7 @@ def _typeof_helper(val, array_class_type):
         )
 
     try:
-        device = val.sycl_device.filter_string
+        device = val.sycl_device
     except AttributeError:
         raise ValueError("The device for the usm_ndarray could not be inferred")