Add implementation of and signature for State.getDevice

make batch/sync arguments of State.exec keyword-only

Provide default column_name value for State.addElementCount method,
so that it can be called state.addElementCount(count), or as
state.addElementCount(count, column_name="Descriptive Name")

python/cuda/nvbench/__init__.pyi

@@ -1,7 +1,7 @@
 # from __future__ import annotations
 
 from collections.abc import Callable, Sequence
-from typing import Optional, Self
+from typing import Optional, Self, Union
 
 class CudaStream:
     """Represents CUDA stream
@@ -15,6 +15,18 @@ class CudaStream:
         Special method implement CUDA stream protocol
         from `cuda.core`. Returns a pair of integers:
         (protocol_version, integral_value_of_cudaStream_t pointer)
+
+        Example
+        -------
+            import cuda.core.experimental as core
+            import cuda.nvbench as nvbench
+
+            def bench(state: nvbench.State):
+                dev = core.Device(state.getDevice())
+                dev.set_current()
+                # converts CudaString to core.Stream
+                # using __cuda_stream__ protocol
+                dev.create_stream(state.getStream())
         """
         ...
 
@@ -68,6 +80,9 @@ class State:
     def hasPrinters(self) -> bool:
         "True if configuration has a printer"
         ...
+    def getDevice(self) -> Union[int, None]:
+        "Get device_id of the device from this configuration"
+        ...
     def getStream(self) -> CudaStream:
         "CudaStream object from this configuration"
         ...
@@ -150,6 +165,8 @@ class State:
     def exec(
         self,
         fn: Callable[[Launch], None],
+        /,
+        *,
         batched: Optional[bool] = True,
         sync: Optional[bool] = False,
     ):

python/src/py_nvbench.cpp

@@ -344,6 +344,14 @@ PYBIND11_MODULE(_nvbench, m)
   pystate_cls.def("hasPrinters", [](nvbench::state &state) -> bool {
     return state.get_benchmark().get_printer().has_value();
   });
+  pystate_cls.def("getDevice", [](nvbench::state &state) {
+    auto dev = state.get_device();
+    if (dev.has_value())
+    {
+      return py::cast(dev.value().get_id());
+    }
+    return py::object(py::none());
+  });
 
   pystate_cls.def(
     "getStream",
@@ -359,7 +367,10 @@ PYBIND11_MODULE(_nvbench, m)
   pystate_cls.def("getString", &nvbench::state::get_string);
   pystate_cls.def("getString", &nvbench::state::get_string_or_default);
 
-  pystate_cls.def("addElementCount", &nvbench::state::add_element_count);
+  pystate_cls.def("addElementCount",
+                  &nvbench::state::add_element_count,
+                  py::arg("count"),
+                  py::arg("column_name") = py::str(""));
   pystate_cls.def("setElementCount", &nvbench::state::set_element_count);
   pystate_cls.def("getElementCount", &nvbench::state::get_element_count);