malloclab start

malloclab/fsecs.c

@@ -0,0 +1,43 @@
+/****************************
+ * High-level timing wrappers
+ ****************************/
+#include <stdio.h>
+#include "fsecs.h"
+#include "fcyc.h"
+#include "clock.h"
+ //#include "ftimer.h"
+#include "config.h"
+
+static double Mhz;  /* estimated CPU clock frequency */
+
+extern int verbose; /* -v option in mdriver.c */
+
+/*
+ * init_fsecs - initialize the timing package
+ */
+void init_fsecs(void)
+{
+	Mhz = 0; /* keep gcc -Wall happy */
+
+	if (verbose)
+		printf("[%s]通过cycle计数器来测量性能.\n", __func__);
+
+	/* set key parameters for the fcyc package */
+	set_fcyc_maxsamples(200);
+	set_fcyc_clear_cache(1);
+	set_fcyc_epsilon(0.01);
+	set_fcyc_k(3);
+	Mhz = mhz(verbose > 0);
+	//    printf("[%s]Your CPU is %fMhz\n",__func__, Mhz);
+}
+
+/*
+ * fsecs - Return the running time of a function f (in seconds)
+ */
+double fsecs(fsecs_test_funct f, void* argp)
+{
+	double cycles = fcyc(f, argp);
+	return cycles / (Mhz * 1e6);
+}
+
+