EXPERIMENT: [C++] Always prefer mimalloc to jemalloc

Author: pitrou

cpp/src/arrow/memory_pool.cc

@@ -85,15 +85,10 @@ struct SupportedBackend {
 
 const std::vector<SupportedBackend>& SupportedBackends() {
   static std::vector<SupportedBackend> backends = {
-  // ARROW-12316: Apple => mimalloc first, then jemalloc
-  //              non-Apple => jemalloc first, then mimalloc
-#if defined(ARROW_JEMALLOC) && !defined(__APPLE__)
-    {"jemalloc", MemoryPoolBackend::Jemalloc},
-#endif
 #ifdef ARROW_MIMALLOC
     {"mimalloc", MemoryPoolBackend::Mimalloc},
 #endif
-#if defined(ARROW_JEMALLOC) && defined(__APPLE__)
+#ifdef ARROW_JEMALLOC
     {"jemalloc", MemoryPoolBackend::Jemalloc},
 #endif
     {"system", MemoryPoolBackend::System}

dev/archery/archery/benchmark/runner.py

@@ -123,6 +123,8 @@ def default_configuration(**kwargs):
             with_csv=True,
             with_dataset=True,
             with_json=True,
+            with_mimalloc=True,
+            with_jemalloc=True,
             with_parquet=True,
             with_python=False,
             with_brotli=True,