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.
27 #include <sys/types.h>
34 #include <urcu/arch.h>
35 #include <urcu/tls-compat.h>
37 #include "thread-id.h"
38 #include "../common/debug-yield.h"
40 /* hardcoded number of CPUs */
43 #ifndef DYNAMIC_LINK_TEST
48 static volatile int test_go
, test_stop
;
50 static unsigned long wdelay
;
52 static int *test_rcu_pointer
;
54 static unsigned long duration
;
56 /* read-side C.S. duration, in loops */
57 static unsigned long rduration
;
59 /* write-side C.S. duration, in loops */
60 static unsigned long wduration
;
62 static inline void loop_sleep(unsigned long loops
)
68 static int verbose_mode
;
70 #define printf_verbose(fmt, args...) \
76 static unsigned int cpu_affinities
[NR_CPUS
];
77 static unsigned int next_aff
= 0;
78 static int use_affinity
= 0;
80 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
82 static void set_affinity(void)
84 #if HAVE_SCHED_SETAFFINITY
87 #endif /* HAVE_SCHED_SETAFFINITY */
92 #if HAVE_SCHED_SETAFFINITY
93 ret
= pthread_mutex_lock(&affinity_mutex
);
95 perror("Error in pthread mutex lock");
98 cpu
= cpu_affinities
[next_aff
++];
99 ret
= pthread_mutex_unlock(&affinity_mutex
);
101 perror("Error in pthread mutex unlock");
107 #if SCHED_SETAFFINITY_ARGS == 2
108 sched_setaffinity(0, &mask
);
110 sched_setaffinity(0, sizeof(mask
), &mask
);
112 #endif /* HAVE_SCHED_SETAFFINITY */
116 * returns 0 if test should end.
118 static int test_duration_write(void)
123 static int test_duration_read(void)
128 static DEFINE_URCU_TLS(unsigned long long, nr_writes
);
129 static DEFINE_URCU_TLS(unsigned long long, nr_reads
);
131 static unsigned int nr_readers
;
132 static unsigned int nr_writers
;
134 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
136 void rcu_copy_mutex_lock(void)
139 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
141 perror("Error in pthread mutex lock");
146 void rcu_copy_mutex_unlock(void)
150 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
152 perror("Error in pthread mutex unlock");
157 void *thr_reader(void *_count
)
159 unsigned long long *count
= _count
;
162 printf_verbose("thread_begin %s, tid %lu\n",
163 "reader", urcu_get_thread_id());
167 rcu_register_thread();
168 assert(!rcu_read_ongoing());
177 assert(rcu_read_ongoing());
178 local_ptr
= rcu_dereference(test_rcu_pointer
);
179 rcu_debug_yield_read();
181 assert(*local_ptr
== 8);
182 if (caa_unlikely(rduration
))
183 loop_sleep(rduration
);
185 URCU_TLS(nr_reads
)++;
186 if (caa_unlikely(!test_duration_read()))
190 rcu_unregister_thread();
192 *count
= URCU_TLS(nr_reads
);
193 printf_verbose("thread_end %s, tid %lu\n",
194 "reader", urcu_get_thread_id());
199 void *thr_writer(void *_count
)
201 unsigned long long *count
= _count
;
204 printf_verbose("thread_begin %s, tid %lu\n",
205 "writer", urcu_get_thread_id());
215 new = malloc(sizeof(int));
217 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
218 if (caa_unlikely(wduration
))
219 loop_sleep(wduration
);
224 URCU_TLS(nr_writes
)++;
225 if (caa_unlikely(!test_duration_write()))
227 if (caa_unlikely(wdelay
))
231 printf_verbose("thread_end %s, tid %lu\n",
232 "writer", urcu_get_thread_id());
233 *count
= URCU_TLS(nr_writes
);
237 void show_usage(int argc
, char **argv
)
239 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
241 printf("OPTIONS:\n");
242 printf(" [-r] [-w] (yield reader and/or writer)\n");
243 printf(" [-d delay] (writer period (us))\n");
244 printf(" [-c duration] (reader C.S. duration (in loops))\n");
245 printf(" [-e duration] (writer C.S. duration (in loops))\n");
246 printf(" [-v] (verbose output)\n");
247 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
251 int main(int argc
, char **argv
)
254 pthread_t
*tid_reader
, *tid_writer
;
256 unsigned long long *count_reader
, *count_writer
;
257 unsigned long long tot_reads
= 0, tot_writes
= 0;
261 show_usage(argc
, argv
);
265 err
= sscanf(argv
[1], "%u", &nr_readers
);
267 show_usage(argc
, argv
);
271 err
= sscanf(argv
[2], "%u", &nr_writers
);
273 show_usage(argc
, argv
);
277 err
= sscanf(argv
[3], "%lu", &duration
);
279 show_usage(argc
, argv
);
283 for (i
= 4; i
< argc
; i
++) {
284 if (argv
[i
][0] != '-')
286 switch (argv
[i
][1]) {
288 rcu_debug_yield_enable(RCU_YIELD_READ
);
291 rcu_debug_yield_enable(RCU_YIELD_WRITE
);
295 show_usage(argc
, argv
);
299 cpu_affinities
[next_aff
++] = a
;
301 printf_verbose("Adding CPU %d affinity\n", a
);
305 show_usage(argc
, argv
);
308 rduration
= atol(argv
[++i
]);
312 show_usage(argc
, argv
);
315 wdelay
= atol(argv
[++i
]);
319 show_usage(argc
, argv
);
322 wduration
= atol(argv
[++i
]);
330 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
331 duration
, nr_readers
, nr_writers
);
332 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
333 printf_verbose("Reader duration : %lu loops.\n", rduration
);
334 printf_verbose("thread %-6s, tid %lu\n",
335 "main", urcu_get_thread_id());
337 tid_reader
= calloc(nr_readers
, sizeof(*tid_reader
));
338 tid_writer
= calloc(nr_writers
, sizeof(*tid_writer
));
339 count_reader
= calloc(nr_readers
, sizeof(*count_reader
));
340 count_writer
= calloc(nr_writers
, sizeof(*count_writer
));
344 for (i
= 0; i
< nr_readers
; i
++) {
345 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
350 for (i
= 0; i
< nr_writers
; i
++) {
351 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
365 for (i
= 0; i
< nr_readers
; i
++) {
366 err
= pthread_join(tid_reader
[i
], &tret
);
369 tot_reads
+= count_reader
[i
];
371 for (i
= 0; i
< nr_writers
; i
++) {
372 err
= pthread_join(tid_writer
[i
], &tret
);
375 tot_writes
+= count_writer
[i
];
378 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
380 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
382 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
383 argv
[0], duration
, nr_readers
, rduration
, wduration
,
384 nr_writers
, wdelay
, tot_reads
, tot_writes
,
385 tot_reads
+ tot_writes
);
386 free(test_rcu_pointer
);