Skip to content
Projects
Groups
Snippets
Help
Loading...
Help
Support
Keyboard shortcuts
?
Submit feedback
Contribute to GitLab
Sign in / Register
Toggle navigation
T
tsn-measures
Project overview
Project overview
Details
Activity
Releases
Repository
Repository
Files
Commits
Branches
Tags
Contributors
Graph
Compare
Issues
0
Issues
0
List
Boards
Labels
Milestones
Merge Requests
0
Merge Requests
0
CI / CD
CI / CD
Pipelines
Jobs
Schedules
Analytics
Analytics
CI / CD
Repository
Value Stream
Wiki
Wiki
Snippets
Snippets
Members
Members
Collapse sidebar
Close sidebar
Activity
Graph
Create a new issue
Jobs
Commits
Issue Boards
Open sidebar
nexedi
tsn-measures
Commits
fda562fd
Commit
fda562fd
authored
Apr 29, 2020
by
oli
Browse files
Options
Browse Files
Download
Email Patches
Plain Diff
Clean code and add back max clock resolution measure
parent
931eb065
Changes
3
Hide whitespace changes
Inline
Side-by-side
Showing
3 changed files
with
86 additions
and
127 deletions
+86
-127
.gitignore
.gitignore
+3
-0
clock-res/build/Makefile
clock-res/build/Makefile
+1
-1
clock-res/src/clockres.c
clock-res/src/clockres.c
+82
-126
No files found.
.gitignore
View file @
fda562fd
...
...
@@ -3,3 +3,6 @@
simple-server/build/main
simple-client/build/main
latency-measure/build/main
latency-measure/build/main
clock-res/build/clockres
clock-res/build/clockres_arm
clock-res/build/Makefile
View file @
fda562fd
...
...
@@ -33,6 +33,6 @@ run: $(PROG)
./
$^
clean
:
$(RM)
$(OBJS)
$(PROG)
$(
subst
.c,.d,
$(SRCS)
)
$(RM)
$(OBJS)
$(PROG)
$(
ARM_PROG)
$(
subst
.c,.d,
$(SRCS)
)
.PHONY
:
clean FORCE
clock-res/src/clockres.c
View file @
fda562fd
#include <errno.h>
#include <error.h>
#include <inttypes.h>
#include <pthread.h>
#include <sched.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <stdint.h>
#include <inttypes.h>
#define CLOCK_ID CLOCK_MONOTONIC
#define NSEC_PER_SEC INT64_C(1000000000)
typedef
struct
thread_stat
{
int
nb_cycles
;
int64_t
max_res
;
int64_t
min_res
;
u
int64_t
max_res
;
u
int64_t
min_res
;
}
thread_stat_t
;
typedef
struct
thread_param
{
int
priority
;
int
max_cycles
;
int64_t
interval
;
u
int64_t
interval
;
thread_stat_t
stat
;
}
thread_param_t
;
...
...
@@ -30,168 +30,124 @@ typedef struct main_param {
int
refresh_rate
;
}
main_param_t
;
static
inline
int64_t
calcdiff_ns
(
struct
timespec
t1
,
struct
timespec
t2
)
{
int64_t
diff
;
diff
=
NSEC_PER_SEC
*
(
int64_t
)((
int
)
t1
.
tv_sec
-
(
int
)
t2
.
tv_sec
);
diff
+=
((
int
)
t1
.
tv_nsec
-
(
int
)
t2
.
tv_nsec
);
return
diff
;
}
static
inline
int64_t
max
(
int64_t
a
,
int64_t
b
)
{
return
a
>
b
?
a
:
b
;
}
static
inline
int64_t
min
(
int64_t
a
,
int64_t
b
)
{
return
a
<
b
?
a
:
b
;
}
// Code from cyclictest
void
compute_resolution
()
{
int
clock
;
uint64_t
diff
;
int
k
;
uint64_t
min_non_zero_diff
=
UINT64_MAX
;
struct
timespec
now
;
struct
timespec
prev
;
struct
timespec
*
time
;
int
times
;
clock
=
CLOCK_ID
;
/*
* Calculate how many calls to clock_gettime are needed.
* Then call it that many times.
* Goal is to collect timestamps for ~ 0.001 sec.
* This will reliably capture resolution <= 500 usec.
*/
times
=
1000
;
clock_gettime
(
clock
,
&
prev
);
for
(
k
=
0
;
k
<
times
;
k
++
)
{
clock_gettime
(
clock
,
&
now
);
}
diff
=
calcdiff_ns
(
now
,
prev
);
if
(
diff
==
0
)
{
/*
* No clock rollover occurred.
* Use the default value for times.
*/
times
=
-
1
;
}
else
{
int
call_time
;
call_time
=
diff
/
times
;
/* duration 1 call */
times
=
NSEC_PER_SEC
/
call_time
;
/* calls per second */
times
/=
1000
;
/* calls per msec */
if
(
times
<
1000
)
times
=
1000
;
}
/* sanity check */
if
((
times
<=
0
)
||
(
times
>
100000
))
times
=
100000
;
time
=
calloc
(
times
,
sizeof
(
*
time
));
static
void
process_options
(
int
argc
,
char
*
argv
[],
thread_param_t
*
param
,
main_param_t
*
main_param
);
for
(
k
=
0
;
k
<
times
;
k
++
)
{
clock_gettime
(
clock
,
&
time
[
k
]);
}
prev
=
time
[
0
];
for
(
k
=
1
;
k
<
times
;
k
++
)
{
diff
=
calcdiff_ns
(
time
[
k
],
prev
);
prev
=
time
[
k
];
if
(
diff
&&
(
diff
<
min_non_zero_diff
))
{
min_non_zero_diff
=
diff
;
}
}
free
(
time
);
printf
(
"measured clock resolution approximately: %llu nsec
\n
"
,
(
unsigned
long
long
)
min_non_zero_diff
);
}
static
inline
uint64_t
calcdiff_ns
(
struct
timespec
t1
,
struct
timespec
t2
);
static
inline
uint64_t
max
(
uint64_t
a
,
uint64_t
b
);
static
inline
uint64_t
min
(
uint64_t
a
,
uint64_t
b
);
// Real-time thread
// Sends packets at a regular intervall
static
void
*
timerthread
(
void
*
p
)
{
struct
timespec
previous
,
current
;
struct
sched_param
priority
;
uint64_t
diff
;
thread_param_t
*
param
=
(
thread_param_t
*
)
p
;
thread_stat_t
*
stat
=
&
param
->
stat
;
thread_param_t
*
param
=
(
thread_param_t
*
)
p
;
thread_stat_t
*
stat
=
&
param
->
stat
;
priority
.
sched_priority
=
param
->
priority
;
int
err
=
sched_setscheduler
(
0
,
SCHED_FIFO
,
&
priority
);
if
(
err
)
error
(
EXIT_FAILURE
,
errno
,
"Couldn't set priority"
);
if
(
sched_setscheduler
(
0
,
SCHED_FIFO
,
&
priority
))
error
(
EXIT_FAILURE
,
errno
,
"Couldn't set priority"
);
stat
->
max_res
=
0
;
stat
->
min_res
=
1000000
;
stat
->
min_res
=
UINT64_MAX
;
for
(
stat
->
nb_cycles
=
0
;;
stat
->
nb_cycles
++
)
{
if
(
param
->
max_cycles
)
if
(
stat
->
nb_cycles
>=
param
->
max_cycles
)
break
;
for
(
stat
->
nb_cycles
=
0
;;
stat
->
nb_cycles
++
)
{
compute_resolution
();
if
(
param
->
max_cycles
&&
(
stat
->
nb_cycles
>=
param
->
max_cycles
))
break
;
usleep
(
param
->
interval
);
}
clock_gettime
(
CLOCK_ID
,
&
previous
);
clock_gettime
(
CLOCK_ID
,
&
current
);
printf
(
"Done
\n
"
);
diff
=
calcdiff_ns
(
current
,
previous
);
return
NULL
;
}
stat
->
max_res
=
max
(
stat
->
max_res
,
diff
)
;
stat
->
min_res
=
min
(
stat
->
min_res
,
diff
);
static
void
process_options
(
int
argc
,
char
*
argv
[],
thread_param_t
*
param
,
main_param_t
*
main_param
)
{
for
(;;)
{
int
c
=
getopt
(
argc
,
argv
,
"l:p:i:r:"
);
if
(
c
==
-
1
)
break
;
switch
(
c
)
{
case
'p'
:
param
->
priority
=
atoi
(
optarg
);
break
;
case
'l'
:
param
->
max_cycles
=
atoi
(
optarg
);
break
;
case
'i'
:
param
->
interval
=
atoi
(
optarg
);
break
;
case
'r'
:
main_param
->
refresh_rate
=
atoi
(
optarg
);
break
;
default:
exit
(
EXIT_FAILURE
);
break
;
}
usleep
(
param
->
interval
);
}
}
return
NULL
;
}
// Main thread, has non-real time priority
// Handles the IO and creates real time threads
int
main
(
int
argc
,
char
*
argv
[])
{
pthread_t
thread
;
thread_param_t
param
;
main_param_t
main_param
;
int
err
;
// Default values
param
.
interval
=
1
00
;
param
.
interval
=
10
00
;
param
.
max_cycles
=
100000
;
param
.
priority
=
99
;
main_param
.
refresh_rate
=
10000
;
process_options
(
argc
,
argv
,
&
param
,
&
main_param
);
usleep
(
10000
);
err
=
pthread_create
(
&
thread
,
NULL
,
timerthread
,
(
void
*
)
&
param
);
if
(
err
)
error
(
EXIT_FAILURE
,
errno
,
"Couldn't create thread"
);
if
(
pthread_create
(
&
thread
,
NULL
,
timerthread
,
(
void
*
)
&
param
))
error
(
EXIT_FAILURE
,
errno
,
"Couldn't create thread"
);
for
(;;)
{
usleep
(
main_param
.
refresh_rate
);
if
(
param
.
max_cycles
==
param
.
stat
.
nb_cycles
)
break
;
printf
(
"Maximum res: %"
PRIu64
"ns (%d)"
,
(
param
.
stat
.
max_res
),
param
.
stat
.
nb_cycles
);
printf
(
", minimum res: %"
PRIu64
"ns (%d)
\n
"
,
(
param
.
stat
.
min_res
),
param
.
stat
.
nb_cycles
);
if
(
param
.
max_cycles
==
param
.
stat
.
nb_cycles
)
break
;
}
exit
(
EXIT_SUCCESS
);
}
static
void
process_options
(
int
argc
,
char
*
argv
[],
thread_param_t
*
param
,
main_param_t
*
main_param
)
{
for
(;;)
{
int
c
=
getopt
(
argc
,
argv
,
"l:p:i:r:"
);
if
(
c
==
-
1
)
break
;
switch
(
c
)
{
case
'p'
:
param
->
priority
=
atoi
(
optarg
);
break
;
case
'l'
:
param
->
max_cycles
=
atoi
(
optarg
);
break
;
case
'i'
:
param
->
interval
=
atoi
(
optarg
);
break
;
case
'r'
:
main_param
->
refresh_rate
=
atoi
(
optarg
);
break
;
default:
exit
(
EXIT_FAILURE
);
break
;
}
}
}
static
inline
uint64_t
calcdiff_ns
(
struct
timespec
t1
,
struct
timespec
t2
)
{
uint64_t
diff
;
diff
=
NSEC_PER_SEC
*
(
uint64_t
)((
int
)
t1
.
tv_sec
-
(
int
)
t2
.
tv_sec
);
diff
+=
((
int
)
t1
.
tv_nsec
-
(
int
)
t2
.
tv_nsec
);
return
diff
;
}
static
inline
uint64_t
max
(
uint64_t
a
,
uint64_t
b
)
{
return
a
>
b
?
a
:
b
;
}
static
inline
uint64_t
min
(
uint64_t
a
,
uint64_t
b
)
{
return
a
<
b
?
a
:
b
;
}
Write
Preview
Markdown
is supported
0%
Try again
or
attach a new file
Attach a file
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment