4 * Userspace RCU library - test program
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
28 #include <sys/types.h>
33 #include <sys/syscall.h>
38 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
39 #define CACHE_LINE_SIZE 4096
41 /* hardcoded number of CPUs */
44 #if defined(_syscall0)
45 _syscall0(pid_t
, gettid
)
46 #elif defined(__NR_gettid)
47 static inline pid_t
gettid(void)
49 return syscall(__NR_gettid
);
52 #warning "use pid as tid"
53 static inline pid_t
gettid(void)
59 #ifndef DYNAMIC_LINK_TEST
62 #define debug_yield_read()
70 struct per_thread_lock
{
72 } __attribute__((aligned(CACHE_LINE_SIZE
))); /* cache-line aligned */
74 static struct per_thread_lock
*per_thread_lock
;
76 static volatile int test_go
, test_stop
;
78 static unsigned long wdelay
;
80 static volatile struct test_array test_array
= { 8 };
82 static unsigned long duration
;
84 /* read-side C.S. duration, in loops */
85 static unsigned long rduration
;
87 static inline void loop_sleep(unsigned long l
)
93 static int verbose_mode
;
95 #define printf_verbose(fmt, args...) \
101 static unsigned int cpu_affinities
[NR_CPUS
];
102 static unsigned int next_aff
= 0;
103 static int use_affinity
= 0;
105 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
107 static void set_affinity(void)
116 ret
= pthread_mutex_lock(&affinity_mutex
);
118 perror("Error in pthread mutex lock");
121 cpu
= cpu_affinities
[next_aff
++];
122 ret
= pthread_mutex_unlock(&affinity_mutex
);
124 perror("Error in pthread mutex unlock");
129 sched_setaffinity(0, sizeof(mask
), &mask
);
133 * returns 0 if test should end.
135 static int test_duration_write(void)
140 static int test_duration_read(void)
145 static unsigned long long __thread nr_writes
;
146 static unsigned long long __thread nr_reads
;
149 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_writes
;
151 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_reads
;
153 static unsigned int nr_readers
;
154 static unsigned int nr_writers
;
156 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
158 void rcu_copy_mutex_lock(void)
161 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
163 perror("Error in pthread mutex lock");
168 void rcu_copy_mutex_unlock(void)
172 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
174 perror("Error in pthread mutex unlock");
179 void *thr_reader(void *data
)
181 unsigned long tidx
= (unsigned long)data
;
183 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
184 "reader", pthread_self(), (unsigned long)gettid());
193 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
194 assert(test_array
.a
== 8);
195 if (unlikely(rduration
))
196 loop_sleep(rduration
);
197 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
199 if (unlikely(!test_duration_read()))
203 tot_nr_reads
[tidx
] = nr_reads
;
204 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
205 "reader", pthread_self(), (unsigned long)gettid());
210 void *thr_writer(void *data
)
212 unsigned long wtidx
= (unsigned long)data
;
215 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
216 "writer", pthread_self(), (unsigned long)gettid());
226 for (tidx
= 0; tidx
< nr_readers
; tidx
++) {
227 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
231 for (tidx
= (long)nr_readers
- 1; tidx
>= 0; tidx
--) {
232 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
235 if (unlikely(!test_duration_write()))
237 if (unlikely(wdelay
))
241 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
242 "writer", pthread_self(), (unsigned long)gettid());
243 tot_nr_writes
[wtidx
] = nr_writes
;
247 void show_usage(int argc
, char **argv
)
249 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
251 printf(" [-r] [-w] (yield reader and/or writer)");
253 printf(" [-d delay] (writer period (us))");
254 printf(" [-c duration] (reader C.S. duration (in loops))");
255 printf(" [-v] (verbose output)");
256 printf(" [-a cpu#] [-a cpu#]... (affinity)");
260 int main(int argc
, char **argv
)
263 pthread_t
*tid_reader
, *tid_writer
;
265 unsigned long long *count_reader
, *count_writer
;
266 unsigned long long tot_reads
= 0, tot_writes
= 0;
270 show_usage(argc
, argv
);
275 err
= sscanf(argv
[1], "%u", &nr_readers
);
277 show_usage(argc
, argv
);
281 err
= sscanf(argv
[2], "%u", &nr_writers
);
283 show_usage(argc
, argv
);
287 err
= sscanf(argv
[3], "%lu", &duration
);
289 show_usage(argc
, argv
);
293 for (i
= 4; i
< argc
; i
++) {
294 if (argv
[i
][0] != '-')
296 switch (argv
[i
][1]) {
299 yield_active
|= YIELD_READ
;
302 yield_active
|= YIELD_WRITE
;
307 show_usage(argc
, argv
);
311 cpu_affinities
[next_aff
++] = a
;
313 printf_verbose("Adding CPU %d affinity\n", a
);
317 show_usage(argc
, argv
);
320 rduration
= atol(argv
[++i
]);
324 show_usage(argc
, argv
);
327 wdelay
= atol(argv
[++i
]);
335 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
336 duration
, nr_readers
, nr_writers
);
337 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
338 printf_verbose("Reader duration : %lu loops.\n", rduration
);
339 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
340 "main", pthread_self(), (unsigned long)gettid());
342 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
343 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
344 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
345 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
346 tot_nr_reads
= malloc(sizeof(*tot_nr_reads
) * nr_readers
);
347 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
348 per_thread_lock
= malloc(sizeof(*per_thread_lock
) * nr_readers
);
352 for (i
= 0; i
< nr_readers
; i
++) {
353 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
358 for (i
= 0; i
< nr_writers
; i
++) {
359 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
373 for (i
= 0; i
< nr_readers
; i
++) {
374 err
= pthread_join(tid_reader
[i
], &tret
);
377 tot_reads
+= tot_nr_reads
[i
];
379 for (i
= 0; i
< nr_writers
; i
++) {
380 err
= pthread_join(tid_writer
[i
], &tret
);
383 tot_writes
+= tot_nr_writes
[i
];
386 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
388 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
390 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
391 argv
[0], duration
, nr_readers
, rduration
,
392 nr_writers
, wdelay
, tot_reads
, tot_writes
,
393 tot_reads
+ tot_writes
);
401 free(per_thread_lock
);