timing against c

experiments/fact/gauss.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <sys/time.h>
+
+int main(int argc, char**argv) {
+  unsigned long i, n, acc=0;
+  struct timeval start, end;
+  sscanf(argv[1], "%lu", &n);
+
+
+  gettimeofday(&start, NULL);
+  for (i = 0; i <= n; i++) {
+    acc = acc + i;
+  }
+  gettimeofday(&end, NULL);
+  printf("%lu (%f milliseconds)\n", 
+	 acc,
+	 (1000.0*(end.tv_sec - start.tv_sec) + 
+	  ((end.tv_usec - start.tv_usec) / 1000.0) ));
+}