X-Git-Url: http://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=tests%2Fbenchmark%2Ftest_looplen.c;fp=tests%2Fbenchmark%2Ftest_looplen.c;h=16674e76ac442343b77ea27d1994a5920cd6c9e7;hp=0000000000000000000000000000000000000000;hb=f5ab766ee2c8300cb00ca5878b1cb464f960a66d;hpb=a5bae03d59c22e57263b8610b9fed99738303cf0

diff --git a/tests/benchmark/test_looplen.c b/tests/benchmark/test_looplen.c
new file mode 100644
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--- /dev/null
+++ b/tests/benchmark/test_looplen.c
@@ -0,0 +1,74 @@
+/*
+ * test_looplen.c
+ *
+ * Userspace RCU library - test program
+ *
+ * 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.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <assert.h>
+#include <sched.h>
+#include <errno.h>
+
+#include <urcu/arch.h>
+
+#ifndef DYNAMIC_LINK_TEST
+#define _LGPL_SOURCE
+#else
+#define debug_yield_read()
+#endif
+#include <urcu.h>
+
+static inline void loop_sleep(unsigned long loops)
+{
+	while (loops-- != 0)
+		caa_cpu_relax();
+}
+
+#define LOOPS 1048576
+#define TESTS 10
+
+int main(int argc, char **argv)
+{
+	unsigned long i;
+	cycles_t time1, time2;
+	cycles_t time_tot = 0;
+	double cpl;
+
+	for (i = 0; i < TESTS; i++) {
+		time1 = caa_get_cycles();
+		loop_sleep(LOOPS);
+		time2 = caa_get_cycles();
+		time_tot += time2 - time1;
+	}
+	cpl = ((double)time_tot) / (double)TESTS / (double)LOOPS;
+
+	printf("CALIBRATION : %g cycles per loop\n", cpl);
+	printf("time_tot = %llu, LOOPS = %d, TESTS = %d\n",
+	       time_tot, LOOPS, TESTS);
+
+	return 0;
+}