diff options
| -rw-r--r-- | hurd/porting/guidelines.mdwn | 4 | ||||
| -rw-r--r-- | open_issues/performance/io_system/binutils_ld_64ksec.mdwn | 2 | ||||
| -rw-r--r-- | open_issues/performance/io_system/test-lseek.c | 17 | ||||
| -rw-r--r-- | open_issues/performance/io_system/test-mach.c | 19 |
4 files changed, 42 insertions, 0 deletions
diff --git a/hurd/porting/guidelines.mdwn b/hurd/porting/guidelines.mdwn index efc8982a..7de9a6f2 100644 --- a/hurd/porting/guidelines.mdwn +++ b/hurd/porting/guidelines.mdwn @@ -306,6 +306,10 @@ Not implemented, not POSIX. Try to disable the feature in the package. There is no programming interface for the parallel port on GNU/Hurd yet. +## <a name="baud"> CBAUD </a> + +This is not actually standard; cfsetspeed, cfsetispeed, or cfsetospeed should be used instead. + ## <a name="errno"> `errno` values </a> When dealing with `errno`, you should always use the predefined error codes defined with the `E*` constants, instead of manually comparing/assigning/etc with their values. 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; +} |