1 files changed, 7 insertions, 0 deletions
diff --git a/Src/mem.c b/Src/mem.c
index 158ad9641..3138bb1d5 100644
--- a/Src/mem.c
+++ b/Src/mem.c
@@ -79,9 +79,16 @@
 
 #include <sys/mman.h>
 
+#if 0
+/*
+ * This change was designed to enable use of memory mapping on MacOS.
+ * However, performance tests indicate that MacOS mapped regions are
+ * significantly slower to allocate than memory from malloc().
+ */
 #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
 #define MAP_ANONYMOUS MAP_ANON
 #endif
+#endif /* 0 */
 
 #if defined(MAP_ANONYMOUS) && defined(MAP_PRIVATE)