From ad0f2aa843232649166e0252e28b96c1736c5082 Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Wed, 2 Nov 2011 12:48:18 +0100
Subject: Add lseek/mach testcases

---
 .../performance/io_system/binutils_ld_64ksec.mdwn      |  2 ++
 open_issues/performance/io_system/test-lseek.c         | 16 ++++++++++++++++
 open_issues/performance/io_system/test-mach.c          | 18 ++++++++++++++++++
 3 files changed, 36 insertions(+)
 create mode 100644 open_issues/performance/io_system/test-lseek.c
 create mode 100644 open_issues/performance/io_system/test-mach.c

(limited to 'open_issues/performance/io_system')

diff --git a/open_issues/performance/io_system/binutils_ld_64ksec.mdwn b/open_issues/performance/io_system/binutils_ld_64ksec.mdwn
index 359d5fee..39d95349 100644
--- a/open_issues/performance/io_system/binutils_ld_64ksec.mdwn
+++ b/open_issues/performance/io_system/binutils_ld_64ksec.mdwn
@@ -47,4 +47,6 @@ IRC, freenode, #hurd, 2011-09-01:
     <youpi> (fgetpos actually, but that's the same)
     <youpi> and it is indeed about 10 times slower under Xen for some reason
 
+Also see testcase [[test-lseek.c]] and [[test-mach.c]]
+
 [[!tag open_issue_xen]]
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..691e9d07
--- /dev/null
+++ b/open_issues/performance/io_system/test-lseek.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <math.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/time.h>
+int main(void) {
+	int fd = open("test.c", O_RDONLY);
+	struct timeval tv1, tv2;
+	int i;
+	gettimeofday(&tv1, NULL);
+	for (i = 0; i < 100000; i++)
+		lseek(fd, 0, SEEK_CUR);
+	gettimeofday(&tv2, NULL);
+	printf("%07lu\n", (tv2.tv_sec-tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec);
+	return 0;
+}
diff --git a/open_issues/performance/io_system/test-mach.c b/open_issues/performance/io_system/test-mach.c
new file mode 100644
index 00000000..44f62a4e
--- /dev/null
+++ b/open_issues/performance/io_system/test-mach.c
@@ -0,0 +1,18 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <fcntl.h>
+#include <mach/mach.h>
+int main(void) {
+	struct timeval tv1, tv2;
+	int i;
+	task_t task;
+	task = mach_task_self();
+	mach_port_urefs_t refs;
+	gettimeofday(&tv1, NULL);
+	for (i = 0; i < 1000000; i++) {
+		mach_port_get_refs(task, task, MACH_PORT_RIGHT_RECEIVE, &refs);
+	}
+	gettimeofday(&tv2, NULL);
+	printf("%07lu\n", (tv2.tv_sec-tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec);
+	return 0;
+}
-- 
cgit v1.2.3


From 2e315ef11db39e8ee0a0decc054801521ee049dd Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Sat, 5 Nov 2011 15:23:57 +0100
Subject: better formatting

---
 open_issues/performance/io_system/test-lseek.c | 5 +++--
 open_issues/performance/io_system/test-mach.c  | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

(limited to 'open_issues/performance/io_system')

diff --git a/open_issues/performance/io_system/test-lseek.c b/open_issues/performance/io_system/test-lseek.c
index 691e9d07..667dce66 100644
--- a/open_issues/performance/io_system/test-lseek.c
+++ b/open_issues/performance/io_system/test-lseek.c
@@ -3,14 +3,15 @@
 #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 < 100000; i++)
+	for (i = 0; i < N; i++)
 		lseek(fd, 0, SEEK_CUR);
 	gettimeofday(&tv2, NULL);
-	printf("%07lu\n", (tv2.tv_sec-tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec);
+	printf("%fµs\n", (float)((tv2.tv_sec-tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec)/N);
 	return 0;
 }
diff --git a/open_issues/performance/io_system/test-mach.c b/open_issues/performance/io_system/test-mach.c
index 44f62a4e..90337346 100644
--- a/open_issues/performance/io_system/test-mach.c
+++ b/open_issues/performance/io_system/test-mach.c
@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <fcntl.h>
 #include <mach/mach.h>
+#define N 1000000
 int main(void) {
 	struct timeval tv1, tv2;
 	int i;
@@ -9,10 +10,10 @@ int main(void) {
 	task = mach_task_self();
 	mach_port_urefs_t refs;
 	gettimeofday(&tv1, NULL);
-	for (i = 0; i < 1000000; i++) {
+	for (i = 0; i < N; i++) {
 		mach_port_get_refs(task, task, MACH_PORT_RIGHT_RECEIVE, &refs);
 	}
 	gettimeofday(&tv2, NULL);
-	printf("%07lu\n", (tv2.tv_sec-tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec);
+	printf("%fµs\n", (float)((tv2.tv_sec-tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec)/N);
 	return 0;
 }
-- 
cgit v1.2.3