reduce number of threads with disjoint pool

Author: lplewa

benchmark/benchmark.cpp

@@ -30,11 +30,10 @@
 // The exact meaning of each argument depends on the benchmark, allocator, and size components used.
 // Refer to the 'argsName()' function in each component to find detailed descriptions of these arguments.
 
+template <size_t max_threads = 12>
 static void multithreaded(benchmark::internal::Benchmark *benchmark) {
-    benchmark->Threads(12);
-    benchmark->Threads(8);
-    benchmark->Threads(4);
     benchmark->Threads(1);
+    benchmark->DenseThreadRange(4, max_threads, 4);
 }
 
 static void singlethreaded(benchmark::internal::Benchmark *benchmark) {
@@ -91,14 +90,16 @@ UMF_BENCHMARK_TEMPLATE_DEFINE(multiple_malloc_free_benchmark, disjoint_pool_fix,
                               pool_allocator<disjoint_pool<os_provider>>);
 UMF_BENCHMARK_REGISTER_F(multiple_malloc_free_benchmark, disjoint_pool_fix)
     ->Apply(&default_multiple_alloc_fix_size)
-    ->Apply(&multithreaded);
+    // Limit benchmarks to 4 threads, as the disjoint pool scales poorly with higher thread counts.
+    ->Apply(&multithreaded<4>);
 
 UMF_BENCHMARK_TEMPLATE_DEFINE(multiple_malloc_free_benchmark,
                               disjoint_pool_uniform, uniform_alloc_size,
                               pool_allocator<disjoint_pool<os_provider>>);
 UMF_BENCHMARK_REGISTER_F(multiple_malloc_free_benchmark, disjoint_pool_uniform)
     ->Apply(&default_multiple_alloc_uniform_size)
-    ->Apply(&multithreaded);
+    // Limit benchmarks to 4 threads, as the disjoint pool scales poorly with higher thread counts.
+    ->Apply(&multithreaded<4>);
 
 #ifdef UMF_POOL_JEMALLOC_ENABLED
 UMF_BENCHMARK_TEMPLATE_DEFINE(multiple_malloc_free_benchmark, jemalloc_pool_fix,