Fix some compilation/setup issues

README.md

@@ -19,20 +19,6 @@ cd tpch/tpch-dbgen
 make
 ```
 
-Notes:
-
-- For MacOS, the above `make` command will result in an error while compiling like below,
-
-   ```shell
-   bm_utils.c:71:10: fatal error: 'malloc.h' file not found
-   #include <malloc.h>
-            ^~~~~~~~~~
-   1 error generated.
-   make: *** [bm_utils.o] Error 1
-   ```
-  To fix this, change the import statement `#include <malloc.h>` to `#include <sys/malloc.h>` in the files where error
-  is reported (`bm_utils.c` and `varsub.c`) and then re-run the command `make`.
-
 ### Execute
 
 ```shell

run.sh

@@ -1,5 +1,5 @@
 export RUN_LOG_TIMINGS=1
-export SCALE_FACTOR=1
+export SCALE_FACTOR=1.0
 
 echo run with cached IO
 make tables

tpch-dbgen/bm_utils.c

@@ -68,7 +68,11 @@
 #include <ctype.h>
 #include <math.h>
 #ifndef _POSIX_SOURCE
-#include <malloc.h>
+#ifdef __APPLE__
+    #include <sys/malloc.h>
+#else
+    #include <malloc.h>
+#endif
 #endif /* POSIX_SOURCE */
 #include <fcntl.h>
 #include <sys/types.h>

tpch-dbgen/varsub.c

@@ -41,7 +41,11 @@
 */
 #include <stdio.h>
 #ifndef _POSIX_SOURCE
-#include <malloc.h>
+#ifdef __APPLE__
+    #include <sys/malloc.h>
+#else
+    #include <malloc.h>
+#endif
 #endif /* POSIX_SOURCE */
 #if (defined(_POSIX_)||!defined(WIN32))
 #include <unistd.h>