A simple file write performance test

apps/px4/tests/tests.h

@@ -96,5 +96,6 @@ extern int	test_time(int argc, char *argv[]);
 extern int	test_uart_console(int argc, char *argv[]);
 extern int	test_jig_voltages(int argc, char *argv[]);
 extern int	test_param(int argc, char *argv[]);
+extern int	test_file(int argc, char *argv[]);
 
 #endif /* __APPS_PX4_TESTS_H */

apps/px4/tests/tests_file.c

@@ -0,0 +1,76 @@
+/****************************************************************************
+ *
+ *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file tests_file.c
+ *
+ * File write test.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <systemlib/err.h>
+#include <systemlib/perf_counter.h>
+#include <string.h>
+
+#include <arch/board/up_hrt.h>
+
+#include "tests.h"
+
+int
+test_file(int argc, char *argv[])
+{
+	uint8_t buf[512];
+	hrt_abstime start, end;
+	perf_counter_t wperf = perf_alloc(PC_ELAPSED, "SD writes");
+
+	int fd = open("/fs/microsd/testfile", O_TRUNC | O_WRONLY | O_CREAT);
+	memset(buf, 0, sizeof(buf));
+
+	start = hrt_absolute_time();
+	for (unsigned i = 0; i < 1024; i++) {
+		perf_begin(wperf);
+		write(fd, buf, sizeof(buf));
+		perf_end(wperf);
+	}
+	end = hrt_absolute_time();
+
+	close(fd);
+
+	warnx("512KiB in %llu microseconds", end - start);
+	perf_print_counter(wperf);
+	perf_free(wperf);
+
+	return 0;
+}

apps/px4/tests/tests_main.c

@@ -109,6 +109,7 @@ struct {
 	{"all",			test_all,	OPT_NOALLTEST | OPT_NOJIGTEST, 0},
 	{"jig",			test_jig,	OPT_NOJIGTEST | OPT_NOALLTEST, 0},
 	{"param",		test_param,	0, 0},
+	{"file",		test_file,	0, 0},
 	{"help",		test_help,	OPT_NOALLTEST | OPT_NOHELP | OPT_NOJIGTEST, 0},
 	{NULL,			NULL, 		0, 0}
 };