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>
36 #include <urcu/arch.h>
38 /* hardcoded number of CPUs */
41 #if defined(_syscall0)
42 _syscall0(pid_t
, gettid
)
43 #elif defined(__NR_gettid)
44 static inline pid_t
gettid(void)
46 return syscall(__NR_gettid
);
49 #warning "use pid as tid"
50 static inline pid_t
gettid(void)
56 #ifndef DYNAMIC_LINK_TEST
59 #define debug_yield_read()
67 static volatile int test_go
, test_stop
;
69 static unsigned long wdelay
;
71 static struct test_array
*test_rcu_pointer
;
73 static unsigned long duration
;
75 /* read-side C.S. duration, in loops */
76 static unsigned long rduration
;
78 static inline void loop_sleep(unsigned long l
)
84 static int verbose_mode
;
86 #define printf_verbose(fmt, args...) \
92 static unsigned int cpu_affinities
[NR_CPUS
];
93 static unsigned int next_aff
= 0;
94 static int use_affinity
= 0;
96 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
98 static void set_affinity(void)
107 ret
= pthread_mutex_lock(&affinity_mutex
);
109 perror("Error in pthread mutex lock");
112 cpu
= cpu_affinities
[next_aff
++];
113 ret
= pthread_mutex_unlock(&affinity_mutex
);
115 perror("Error in pthread mutex unlock");
120 sched_setaffinity(0, sizeof(mask
), &mask
);
124 * returns 0 if test should end.
126 static int test_duration_write(void)
131 static int test_duration_read(void)
136 static unsigned long long __thread nr_writes
;
137 static unsigned long long __thread nr_reads
;
139 static unsigned int nr_readers
;
140 static unsigned int nr_writers
;
142 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
144 void rcu_copy_mutex_lock(void)
147 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
149 perror("Error in pthread mutex lock");
154 void rcu_copy_mutex_unlock(void)
158 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
160 perror("Error in pthread mutex unlock");
166 * malloc/free are reusing memory areas too quickly, which does not let us
167 * test races appropriately. Use a large circular array for allocations.
168 * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail.
170 #define ARRAY_SIZE (1048576 * nr_writers)
171 #define ARRAY_POISON 0xDEADBEEF
172 static int array_index
;
173 static struct test_array
*test_array
;
175 static struct test_array
*test_array_alloc(void)
177 struct test_array
*ret
;
180 rcu_copy_mutex_lock();
181 index
= array_index
% ARRAY_SIZE
;
182 assert(test_array
[index
].a
== ARRAY_POISON
||
183 test_array
[index
].a
== 0);
184 ret
= &test_array
[index
];
186 if (array_index
== ARRAY_SIZE
)
188 rcu_copy_mutex_unlock();
192 static void test_array_free(struct test_array
*ptr
)
196 rcu_copy_mutex_lock();
197 ptr
->a
= ARRAY_POISON
;
198 rcu_copy_mutex_unlock();
201 void *thr_reader(void *_count
)
203 unsigned long long *count
= _count
;
204 struct test_array
*local_ptr
;
206 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
207 "reader", pthread_self(), (unsigned long)gettid());
211 rcu_register_thread();
220 local_ptr
= rcu_dereference(test_rcu_pointer
);
223 assert(local_ptr
->a
== 8);
224 if (unlikely(rduration
))
225 loop_sleep(rduration
);
228 if (unlikely(!test_duration_read()))
232 rcu_unregister_thread();
235 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
236 "reader", pthread_self(), (unsigned long)gettid());
241 void *thr_writer(void *_count
)
243 unsigned long long *count
= _count
;
244 struct test_array
*new, *old
;
246 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
247 "writer", pthread_self(), (unsigned long)gettid());
257 new = test_array_alloc();
259 old
= rcu_publish_content(&test_rcu_pointer
, new);
262 test_array_free(old
);
264 if (unlikely(!test_duration_write()))
266 if (unlikely(wdelay
))
270 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
271 "writer", pthread_self(), (unsigned long)gettid());
276 void show_usage(int argc
, char **argv
)
278 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
280 printf(" [-r] [-w] (yield reader and/or writer)");
282 printf(" [-d delay] (writer period (us))");
283 printf(" [-c duration] (reader C.S. duration (in loops))");
284 printf(" [-v] (verbose output)");
285 printf(" [-a cpu#] [-a cpu#]... (affinity)");
289 int main(int argc
, char **argv
)
292 pthread_t
*tid_reader
, *tid_writer
;
294 unsigned long long *count_reader
, *count_writer
;
295 unsigned long long tot_reads
= 0, tot_writes
= 0;
299 show_usage(argc
, argv
);
303 err
= sscanf(argv
[1], "%u", &nr_readers
);
305 show_usage(argc
, argv
);
309 err
= sscanf(argv
[2], "%u", &nr_writers
);
311 show_usage(argc
, argv
);
315 err
= sscanf(argv
[3], "%lu", &duration
);
317 show_usage(argc
, argv
);
321 for (i
= 4; i
< argc
; i
++) {
322 if (argv
[i
][0] != '-')
324 switch (argv
[i
][1]) {
327 yield_active
|= YIELD_READ
;
330 yield_active
|= YIELD_WRITE
;
335 show_usage(argc
, argv
);
339 cpu_affinities
[next_aff
++] = a
;
341 printf_verbose("Adding CPU %d affinity\n", a
);
345 show_usage(argc
, argv
);
348 rduration
= atol(argv
[++i
]);
352 show_usage(argc
, argv
);
355 wdelay
= atol(argv
[++i
]);
363 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
364 duration
, nr_readers
, nr_writers
);
365 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
366 printf_verbose("Reader duration : %lu loops.\n", rduration
);
367 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
368 "main", pthread_self(), (unsigned long)gettid());
370 test_array
= malloc(sizeof(*test_array
) * ARRAY_SIZE
);
371 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
372 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
373 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
374 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
378 for (i
= 0; i
< nr_readers
; i
++) {
379 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
384 for (i
= 0; i
< nr_writers
; i
++) {
385 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
399 for (i
= 0; i
< nr_readers
; i
++) {
400 err
= pthread_join(tid_reader
[i
], &tret
);
403 tot_reads
+= count_reader
[i
];
405 for (i
= 0; i
< nr_writers
; i
++) {
406 err
= pthread_join(tid_writer
[i
], &tret
);
409 tot_writes
+= count_writer
[i
];
412 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
414 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
416 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
417 argv
[0], duration
, nr_readers
, rduration
,
418 nr_writers
, wdelay
, tot_reads
, tot_writes
,
419 tot_reads
+ tot_writes
);
420 test_array_free(test_rcu_pointer
);