runs as C++, no vector support yet

test/memusage.cc

@@ -0,0 +1,64 @@
+/*
+ *  This file is part of libc_utils.
+ *
+ *  libc_utils is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  libc_utils is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with libc_utils; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/* libc_utils is being developed at the Max-Planck-Institut fuer Astrophysik */
+
+/*
+ *  Functionality for measuring memory consumption
+ *
+ *  Copyright (C) 2012-2019 Max-Planck-Society
+ *  Author: Martin Reinecke
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include "test/memusage.h"
+
+double residentSetSize(void)
+  {
+  FILE *statm = fopen("/proc/self/statm","r");
+  double res;
+  if (!statm) return -1.0;
+  if (fscanf(statm,"%*f %lf",&res))
+      { fclose(statm); return -1.0; }
+  fclose(statm);
+  return (res*4096);
+  }
+
+double VmHWM(void)
+  {
+  char word[1024];
+  FILE *f = fopen("/proc/self/status", "r");
+  double res;
+  if (!f) return -1.0;
+  while(1)
+    {
+    if (fscanf (f,"%1023s",word)<0)
+      { fclose(f); return -1.0; }
+    if (!strncmp(word, "VmHWM:", 6))
+      {
+      if (fscanf(f,"%lf%2s",&res,word)<0)
+        { fclose(f); return -1.0; }
+      if (strncmp(word, "kB", 2))
+        { fclose(f); return -1.0; }
+      res *=1024;
+      fclose(f);
+      return res;
+      }
+    }
+  }