4 * Userspace RCU library - test program
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
24 #include "../config.h"
29 #include <sys/types.h>
36 #include <urcu/arch.h>
37 #include <urcu/tls-compat.h>
44 /* hardcoded number of CPUs */
47 #if defined(_syscall0)
48 _syscall0(pid_t
, gettid
)
49 #elif defined(__NR_gettid)
50 static inline pid_t
gettid(void)
52 return syscall(__NR_gettid
);
55 #warning "use pid as tid"
56 static inline pid_t
gettid(void)
62 #ifndef DYNAMIC_LINK_TEST
65 #define debug_yield_read()
73 static volatile int test_go
, test_stop
;
75 static unsigned long wdelay
;
77 static struct test_array
*test_rcu_pointer
;
79 static unsigned long duration
;
81 /* read-side C.S. duration, in loops */
82 static unsigned long rduration
;
84 /* write-side C.S. duration, in loops */
85 static unsigned long wduration
;
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 #if HAVE_SCHED_SETAFFINITY
117 ret
= pthread_mutex_lock(&affinity_mutex
);
119 perror("Error in pthread mutex lock");
122 cpu
= cpu_affinities
[next_aff
++];
123 ret
= pthread_mutex_unlock(&affinity_mutex
);
125 perror("Error in pthread mutex unlock");
131 #if SCHED_SETAFFINITY_ARGS == 2
132 sched_setaffinity(0, &mask
);
134 sched_setaffinity(0, sizeof(mask
), &mask
);
136 #endif /* HAVE_SCHED_SETAFFINITY */
140 * returns 0 if test should end.
142 static int test_duration_write(void)
147 static int test_duration_read(void)
152 static DEFINE_URCU_TLS(unsigned long long, nr_writes
);
153 static DEFINE_URCU_TLS(unsigned long long, nr_reads
);
155 static unsigned int nr_readers
;
156 static unsigned int nr_writers
;
158 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
160 void rcu_copy_mutex_lock(void)
163 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
165 perror("Error in pthread mutex lock");
170 void rcu_copy_mutex_unlock(void)
174 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
176 perror("Error in pthread mutex unlock");
182 * malloc/free are reusing memory areas too quickly, which does not let us
183 * test races appropriately. Use a large circular array for allocations.
184 * ARRAY_SIZE is larger than nr_writers, and we keep the mutex across
185 * both alloc and free, which insures we never run over our tail.
187 #define ARRAY_SIZE (1048576 * nr_writers)
188 #define ARRAY_POISON 0xDEADBEEF
189 static int array_index
;
190 static struct test_array
*test_array
;
192 static struct test_array
*test_array_alloc(void)
194 struct test_array
*ret
;
197 index
= array_index
% ARRAY_SIZE
;
198 assert(test_array
[index
].a
== ARRAY_POISON
||
199 test_array
[index
].a
== 0);
200 ret
= &test_array
[index
];
202 if (array_index
== ARRAY_SIZE
)
207 static void test_array_free(struct test_array
*ptr
)
211 ptr
->a
= ARRAY_POISON
;
214 void *thr_reader(void *_count
)
216 unsigned long long *count
= _count
;
217 struct test_array
*local_ptr
;
219 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
220 "reader", (unsigned long) pthread_self(),
221 (unsigned long) gettid());
225 rcu_register_thread();
234 local_ptr
= rcu_dereference(test_rcu_pointer
);
237 assert(local_ptr
->a
== 8);
238 if (caa_unlikely(rduration
))
239 loop_sleep(rduration
);
241 URCU_TLS(nr_reads
)++;
242 if (caa_unlikely(!test_duration_read()))
246 rcu_unregister_thread();
248 *count
= URCU_TLS(nr_reads
);
249 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
250 "reader", (unsigned long) pthread_self(),
251 (unsigned long) gettid());
256 void *thr_writer(void *_count
)
258 unsigned long long *count
= _count
;
259 struct test_array
*new, *old
;
261 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
262 "writer", (unsigned long) pthread_self(),
263 (unsigned long) gettid());
273 rcu_copy_mutex_lock();
274 new = test_array_alloc();
276 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
277 if (caa_unlikely(wduration
))
278 loop_sleep(wduration
);
282 test_array_free(old
);
283 rcu_copy_mutex_unlock();
284 URCU_TLS(nr_writes
)++;
285 if (caa_unlikely(!test_duration_write()))
287 if (caa_unlikely(wdelay
))
291 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
292 "writer", (unsigned long) pthread_self(),
293 (unsigned long) gettid());
294 *count
= URCU_TLS(nr_writes
);
298 void show_usage(int argc
, char **argv
)
300 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
302 printf(" [-r] [-w] (yield reader and/or writer)");
304 printf(" [-d delay] (writer period (us))");
305 printf(" [-c duration] (reader C.S. duration (in loops))");
306 printf(" [-e duration] (writer C.S. duration (in loops))");
307 printf(" [-v] (verbose output)");
308 printf(" [-a cpu#] [-a cpu#]... (affinity)");
312 int main(int argc
, char **argv
)
315 pthread_t
*tid_reader
, *tid_writer
;
317 unsigned long long *count_reader
, *count_writer
;
318 unsigned long long tot_reads
= 0, tot_writes
= 0;
322 show_usage(argc
, argv
);
326 err
= sscanf(argv
[1], "%u", &nr_readers
);
328 show_usage(argc
, argv
);
332 err
= sscanf(argv
[2], "%u", &nr_writers
);
334 show_usage(argc
, argv
);
338 err
= sscanf(argv
[3], "%lu", &duration
);
340 show_usage(argc
, argv
);
344 for (i
= 4; i
< argc
; i
++) {
345 if (argv
[i
][0] != '-')
347 switch (argv
[i
][1]) {
350 yield_active
|= YIELD_READ
;
353 yield_active
|= YIELD_WRITE
;
358 show_usage(argc
, argv
);
362 cpu_affinities
[next_aff
++] = a
;
364 printf_verbose("Adding CPU %d affinity\n", a
);
368 show_usage(argc
, argv
);
371 rduration
= atol(argv
[++i
]);
375 show_usage(argc
, argv
);
378 wdelay
= atol(argv
[++i
]);
382 show_usage(argc
, argv
);
385 wduration
= atol(argv
[++i
]);
393 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
394 duration
, nr_readers
, nr_writers
);
395 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
396 printf_verbose("Reader duration : %lu loops.\n", rduration
);
397 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
398 "main", (unsigned long) pthread_self(),
399 (unsigned long) gettid());
401 test_array
= calloc(1, sizeof(*test_array
) * ARRAY_SIZE
);
402 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
403 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
404 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
405 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
409 for (i
= 0; i
< nr_readers
; i
++) {
410 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
415 for (i
= 0; i
< nr_writers
; i
++) {
416 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
430 for (i
= 0; i
< nr_readers
; i
++) {
431 err
= pthread_join(tid_reader
[i
], &tret
);
434 tot_reads
+= count_reader
[i
];
436 for (i
= 0; i
< nr_writers
; i
++) {
437 err
= pthread_join(tid_writer
[i
], &tret
);
440 tot_writes
+= count_writer
[i
];
443 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
445 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
447 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
448 argv
[0], duration
, nr_readers
, rduration
, wduration
,
449 nr_writers
, wdelay
, tot_reads
, tot_writes
,
450 tot_reads
+ tot_writes
);
451 test_array_free(test_rcu_pointer
);