From b35e1b289f8b4197cf553b0e1850beeb69590a3d Mon Sep 17 00:00:00 2001
From: CGH0S7 <776459475@qq.com>
Date: Tue, 3 Mar 2026 15:15:06 +0800
Subject: [PATCH] =?UTF-8?q?=E8=AE=BE=E7=BD=AE=E5=BC=80=E5=85=B3=E5=85=B3?=
 =?UTF-8?q?=E9=97=AD=E5=86=85=E5=AD=98=E6=89=93=E5=8D=B0=E7=BB=9F=E8=AE=A1?=
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---
 AMSS_NCKU_source/bssn_class.C | 56 +++++++++++++++++++++--------------
 1 file changed, 33 insertions(+), 23 deletions(-)

diff --git a/AMSS_NCKU_source/bssn_class.C b/AMSS_NCKU_source/bssn_class.C
index 432747e..bcd9117 100644
--- a/AMSS_NCKU_source/bssn_class.C
+++ b/AMSS_NCKU_source/bssn_class.C
@@ -36,12 +36,18 @@ using namespace std;
 #include "myglobal.h"
 #endif
 
-#include "perf.h"
-
-#include "derivatives.h"
-#include "ricci_gamma.h"
-
-//================================================================================================
+#include "perf.h"
+
+#include "derivatives.h"
+#include "ricci_gamma.h"
+
+// Compile-time switch for per-timestep memory usage collection/printing.
+// Default is OFF to reduce overhead in production runs.
+#ifndef BSSN_ENABLE_MEM_USAGE_LOG
+#define BSSN_ENABLE_MEM_USAGE_LOG 0
+#endif
+
+//================================================================================================
 
 // define bssn_class
 
@@ -2129,8 +2135,10 @@ void bssn_class::Evolve(int Steps)
   #endif
   */
   
-  perf bssn_perf;
-  size_t current_min, current_avg, current_max, peak_min, peak_avg, peak_max;
+#if BSSN_ENABLE_MEM_USAGE_LOG
+  perf bssn_perf;
+  size_t current_min, current_avg, current_max, peak_min, peak_avg, peak_max;
+#endif
 
   for (int lev = 0; lev < GH->levels; lev++)
     GH->Lt[lev] = PhysTime;
@@ -2224,21 +2232,23 @@ void bssn_class::Evolve(int Steps)
 //		fgt(PhysTime-dT_mon,StartTime,dT_mon/2),ErrorMonitor);
 #endif
 
-    // Retrieve memory usage information used during computation; master process prints it
-    bssn_perf.MemoryUsage(&current_min, &current_avg, &current_max,
-                          &peak_min, &peak_avg, &peak_max, nprocs);
-    if (myrank == 0)
-    {
-      printf(" Memory usage: current %0.4lg/%0.4lg/%0.4lgMB, "
-             "peak %0.4lg/%0.4lg/%0.4lgMB\n",
-             (double)current_min / (1024.0 * 1024.0),
-             (double)current_avg / (1024.0 * 1024.0),
-             (double)current_max / (1024.0 * 1024.0),
-             (double)peak_min / (1024.0 * 1024.0),
-             (double)peak_avg / (1024.0 * 1024.0),
-             (double)peak_max / (1024.0 * 1024.0));
-      cout << endl;
-    }
+#if BSSN_ENABLE_MEM_USAGE_LOG
+    // Retrieve memory usage information used during computation; master process prints it
+    bssn_perf.MemoryUsage(&current_min, &current_avg, &current_max,
+                          &peak_min, &peak_avg, &peak_max, nprocs);
+    if (myrank == 0)
+    {
+      printf(" Memory usage: current %0.4lg/%0.4lg/%0.4lgMB, "
+             "peak %0.4lg/%0.4lg/%0.4lgMB\n",
+             (double)current_min / (1024.0 * 1024.0),
+             (double)current_avg / (1024.0 * 1024.0),
+             (double)current_max / (1024.0 * 1024.0),
+             (double)peak_min / (1024.0 * 1024.0),
+             (double)peak_avg / (1024.0 * 1024.0),
+             (double)peak_max / (1024.0 * 1024.0));
+      cout << endl;
+    }
+#endif
     
     // Output puncture positions at each step
     if (myrank == 0)