Define buffer size in benchmark according to user's cpu architecture

test/performance/target/buffer.cpp

@@ -19,7 +19,19 @@
 #include <benchmark/benchmark.h>
 #include <stumpless.h>
 #include "test/helper/memory_counter.hpp"
-#define MAX_BUFFER_SIZE (1024 * 1024 * 1024 * 1) // 1 GB
+
+// Define size constants
+#define SIZE_4KB  (4ull * 1024ull)
+#define SIZE_16KB (16ull * 1024ull)
+#define SIZE_32KB (32ull * 1024ull)
+
+#if defined(__x86_64__) || defined(_M_X64) || defined(__aarch64__)
+    #define MAX_BUFFER_SIZE SIZE_32KB
+#elif defined(__i386__) || defined(_M_IX86) || defined(__arm__)
+    #define MAX_BUFFER_SIZE SIZE_16KB
+#else
+    #define MAX_BUFFER_SIZE SIZE_4KB
+#endif
 
 NEW_MEMORY_COUNTER( buffer );