Add count benchmarks + fix a const issue

benchmarks/CMakeLists.txt

@@ -64,6 +64,11 @@ ConfigureBench(STATIC_MAP_BENCH
   hash_table/static_map/contains_bench.cu
   hash_table/static_map/erase_bench.cu)
 
+###################################################################################################
+# - static_multiset benchmarks --------------------------------------------------------------------
+ConfigureBench(STATIC_MULTISET_BENCH
+  hash_table/static_multiset/count_bench.cu)
+
 ###################################################################################################
 # - static_multimap benchmarks --------------------------------------------------------------------
 ConfigureBench(STATIC_MULTIMAP_BENCH

benchmarks/hash_table/static_multiset/count_bench.cu

@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2024, NVIDIA CORPORATION.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <defaults.hpp>
+#include <utils.hpp>
+
+#include <cuco/static_multiset.cuh>
+#include <cuco/utility/key_generator.cuh>
+
+#include <nvbench/nvbench.cuh>
+
+#include <thrust/device_vector.h>
+#include <thrust/transform.h>
+
+using namespace cuco::benchmark;
+using namespace cuco::utility;
+
+template <typename Key, typename Dist>
+void static_multimap_count(nvbench::state& state, nvbench::type_list<Key, Dist>)
+{
+  auto const num_keys      = state.get_int64_or_default("NumInputs", defaults::N);
+  auto const occupancy     = state.get_float64_or_default("Occupancy", defaults::OCCUPANCY);
+  auto const matching_rate = state.get_float64_or_default("MatchingRate", defaults::MATCHING_RATE);
+
+  std::size_t const size = num_keys / occupancy;
+
+  thrust::device_vector<Key> keys(num_keys);
+
+  key_generator gen;
+  gen.generate(dist_from_state<Dist>(state), keys.begin(), keys.end());
+
+  auto map = cuco::static_multiset{size, cuco::empty_key<Key>{-1}};
+  map.insert(keys.begin(), keys.end());
+
+  gen.dropout(keys.begin(), keys.end(), matching_rate);
+
+  state.add_element_count(num_keys);
+  state.exec(nvbench::exec_tag::sync, [&](nvbench::launch& launch) {
+    auto const count = map.count(keys.begin(), keys.end(), {launch.get_stream()});
+  });
+}
+
+NVBENCH_BENCH_TYPES(static_multimap_count,
+                    NVBENCH_TYPE_AXES(defaults::KEY_TYPE_RANGE,
+                                      nvbench::type_list<distribution::uniform>))
+  .set_name("static_multimap_count_uniform_occupancy")
+  .set_type_axes_names({"Key", "Distribution"})
+  .set_max_noise(defaults::MAX_NOISE)
+  .add_float64_axis("Occupancy", defaults::OCCUPANCY_RANGE);
+
+NVBENCH_BENCH_TYPES(static_multimap_count,
+                    NVBENCH_TYPE_AXES(defaults::KEY_TYPE_RANGE,
+                                      nvbench::type_list<distribution::uniform>))
+  .set_name("static_multimap_count_uniform_matching_rate")
+  .set_type_axes_names({"Key", "Distribution"})
+  .set_max_noise(defaults::MAX_NOISE)
+  .add_float64_axis("MatchingRate", defaults::MATCHING_RATE_RANGE);
+
+NVBENCH_BENCH_TYPES(static_multimap_count,
+                    NVBENCH_TYPE_AXES(defaults::KEY_TYPE_RANGE,
+                                      nvbench::type_list<distribution::uniform>))
+  .set_name("static_multimap_count_uniform_multiplicity")
+  .set_type_axes_names({"Key", "Distribution"})
+  .set_max_noise(defaults::MAX_NOISE)
+  .add_int64_axis("Multiplicity", defaults::MULTIPLICITY_RANGE);

include/cuco/detail/static_multiset/static_multiset_ref.inl

@@ -478,7 +478,7 @@ class operator_impl<
   template <typename ProbeKey>
   __device__ size_type count(ProbeKey const& key) const noexcept
   {
-    ref_type& ref_ = static_cast<ref_type&>(*this);
+    auto const& ref_ = static_cast<ref_type const&>(*this);
     return ref_.impl_.count(key);
   }
 
@@ -496,7 +496,7 @@ class operator_impl<
   __device__ size_type count(cooperative_groups::thread_block_tile<cg_size> const& group,
                              ProbeKey const& key) const noexcept
   {
-    auto& ref_ = static_cast<ref_type&>(*this);
+    auto const& ref_ = static_cast<ref_type const&>(*this);
     return ref_.impl_.count(group, key);
   }
 };