Merge commit '2e315ef11db39e8ee0a0decc054801521ee049dd'

1 files changed, 17 insertions, 0 deletions

diff --git a/open_issues/performance/io_system/test-lseek.c b/open_issues/performance/io_system/test-lseek.c
new file mode 100644
index 00000000..667dce66
--- /dev/null
+++ b/open_issues/performance/io_system/test-lseek.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <math.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/time.h>
+#define N 100000
+int main(void) {
+	int fd = open("test.c", O_RDONLY);
+	struct timeval tv1, tv2;
+	int i;
+	gettimeofday(&tv1, NULL);
+	for (i = 0; i < N; i++)
+		lseek(fd, 0, SEEK_CUR);
+	gettimeofday(&tv2, NULL);
+	printf("%fµs\n", (float)((tv2.tv_sec-tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec)/N);
+	return 0;
+}