Add fine-grained step timing and trim BH RHS overhead

AMSS_NCKU_source/macrodef.h

@@ -29,6 +29,12 @@
 
 #define REGLEV 0
 
+#define BSSN_FINE_TIMING 1
+
+#define BSSN_FINE_TIMING_EVERY 1
+
+#define BSSN_FINE_TIMING_TOPN 8
+
 //#define USE_GPU
 
 //#define CHECKDETAIL
@@ -88,6 +94,15 @@
 //     0: for every level;
 //     1: for all
 //
+// define BSSN_FINE_TIMING
+//     enable fine-grained per-timestep timing monitor
+//
+// define BSSN_FINE_TIMING_EVERY
+//     report timing every N coarse timesteps
+//
+// define BSSN_FINE_TIMING_TOPN
+//     number of hottest timing buckets shown in stdout
+//
 // define USE_GPU
 //     use gpu or not
 //