Merge branch 'master' into urcu/rcuja-range-merge

[userspace-rcu.git] / tests / benchmark / test_cycles_per_loop.c

diff --git a/tests/benchmark/test_cycles_per_loop.c b/tests/benchmark/test_cycles_per_loop.c
new file mode 100644 (file)
index 0000000..6ff100b
--- /dev/null
+++ b/tests/benchmark/test_cycles_per_loop.c
@@ -0,0 +1,44 @@
+/*
+ * test_cycles_per_loop.c
+ *
+ * Userspace RCU library - test cycles per loop
+ *
+ * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <urcu/arch.h>
+#include <stdio.h>
+
+#define NR_LOOPS 1000000UL
+
+static inline void loop_sleep(unsigned long loops)
+{
+       while (loops-- != 0)
+               caa_cpu_relax();
+}
+
+int main()
+{
+       cycles_t time1, time2;
+
+       time1 = caa_get_cycles();
+       loop_sleep(NR_LOOPS);
+       time2 = caa_get_cycles();
+       printf("CPU clock cycles per loop: %g\n", (time2 - time1) /
+                                                 (double)NR_LOOPS);
+       return 0;
+}