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-rw-r--r--open_issues/performance/io_system/binutils_ld_64ksec.mdwn2
-rw-r--r--open_issues/performance/io_system/test-lseek.c17
-rw-r--r--open_issues/performance/io_system/test-mach.c19
3 files changed, 38 insertions, 0 deletions
diff --git a/open_issues/performance/io_system/binutils_ld_64ksec.mdwn b/open_issues/performance/io_system/binutils_ld_64ksec.mdwn
index 37fe9c53..d0b8ea7f 100644
--- a/open_issues/performance/io_system/binutils_ld_64ksec.mdwn
+++ b/open_issues/performance/io_system/binutils_ld_64ksec.mdwn
@@ -51,4 +51,6 @@ 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..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;
+}
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..90337346
--- /dev/null
+++ b/open_issues/performance/io_system/test-mach.c
@@ -0,0 +1,19 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <fcntl.h>
+#include <mach/mach.h>
+#define N 1000000
+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 < N; i++) {
+ mach_port_get_refs(task, task, MACH_PORT_RIGHT_RECEIVE, &refs);
+ }
+ gettimeofday(&tv2, NULL);
+ printf("%fµs\n", (float)((tv2.tv_sec-tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec)/N);
+ return 0;
+}