4 * Userspace RCU library - test program (with batch reclamation)
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.
29 #include <sys/types.h>
36 #include <urcu/arch.h>
37 #include <urcu/tls-compat.h>
39 #include "thread-id.h"
40 #include "../common/debug-yield.h"
42 /* hardcoded number of CPUs */
45 #ifndef DYNAMIC_LINK_TEST
54 static volatile int test_go
, test_stop
;
56 static unsigned long wdelay
;
58 static struct test_array
*test_rcu_pointer
;
60 static unsigned int reclaim_batch
= 1;
62 struct reclaim_queue
{
63 void **queue
; /* Beginning of queue */
64 void **head
; /* Insert position */
67 static struct reclaim_queue
*pending_reclaims
;
69 static unsigned long duration
;
71 /* read-side C.S. duration, in loops */
72 static unsigned long rduration
;
74 /* write-side C.S. duration, in loops */
75 static unsigned long wduration
;
77 static inline void loop_sleep(unsigned long loops
)
83 static int verbose_mode
;
85 #define printf_verbose(fmt, args...) \
91 static unsigned int cpu_affinities
[NR_CPUS
];
92 static unsigned int next_aff
= 0;
93 static int use_affinity
= 0;
95 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
97 static void set_affinity(void)
99 #if HAVE_SCHED_SETAFFINITY
102 #endif /* HAVE_SCHED_SETAFFINITY */
107 #if HAVE_SCHED_SETAFFINITY
108 ret
= pthread_mutex_lock(&affinity_mutex
);
110 perror("Error in pthread mutex lock");
113 cpu
= cpu_affinities
[next_aff
++];
114 ret
= pthread_mutex_unlock(&affinity_mutex
);
116 perror("Error in pthread mutex unlock");
122 #if SCHED_SETAFFINITY_ARGS == 2
123 sched_setaffinity(0, &mask
);
125 sched_setaffinity(0, sizeof(mask
), &mask
);
127 #endif /* HAVE_SCHED_SETAFFINITY */
131 * returns 0 if test should end.
133 static int test_duration_write(void)
138 static int test_duration_read(void)
143 static DEFINE_URCU_TLS(unsigned long long, nr_writes
);
144 static DEFINE_URCU_TLS(unsigned long long, nr_reads
);
147 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *tot_nr_writes
;
149 static unsigned int nr_readers
;
150 static unsigned int nr_writers
;
152 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
154 void rcu_copy_mutex_lock(void)
157 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
159 perror("Error in pthread mutex lock");
164 void rcu_copy_mutex_unlock(void)
168 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
170 perror("Error in pthread mutex unlock");
175 void *thr_reader(void *_count
)
177 unsigned long long *count
= _count
;
178 struct test_array
*local_ptr
;
180 printf_verbose("thread_begin %s, tid %lu\n",
181 "reader", urcu_get_thread_id());
185 rcu_register_thread();
194 local_ptr
= rcu_dereference(test_rcu_pointer
);
195 rcu_debug_yield_read();
197 assert(local_ptr
->a
== 8);
198 if (caa_unlikely(rduration
))
199 loop_sleep(rduration
);
201 URCU_TLS(nr_reads
)++;
202 if (caa_unlikely(!test_duration_read()))
206 rcu_unregister_thread();
208 *count
= URCU_TLS(nr_reads
);
209 printf_verbose("thread_end %s, tid %lu\n",
210 "reader", urcu_get_thread_id());
215 static void rcu_gc_clear_queue(unsigned long wtidx
)
219 /* Wait for Q.S and empty queue */
222 for (p
= pending_reclaims
[wtidx
].queue
;
223 p
< pending_reclaims
[wtidx
].head
; p
++) {
226 ((struct test_array
*)*p
)->a
= 0;
229 pending_reclaims
[wtidx
].head
= pending_reclaims
[wtidx
].queue
;
232 /* Using per-thread queue */
233 static void rcu_gc_reclaim(unsigned long wtidx
, void *old
)
236 *pending_reclaims
[wtidx
].head
= old
;
237 pending_reclaims
[wtidx
].head
++;
239 if (caa_likely(pending_reclaims
[wtidx
].head
- pending_reclaims
[wtidx
].queue
243 rcu_gc_clear_queue(wtidx
);
246 void *thr_writer(void *data
)
248 unsigned long wtidx
= (unsigned long)data
;
250 struct test_array
*old
= NULL
;
252 struct test_array
*new, *old
;
255 printf_verbose("thread_begin %s, tid %lu\n",
256 "writer", urcu_get_thread_id());
266 #ifndef TEST_LOCAL_GC
267 new = malloc(sizeof(*new));
269 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
271 if (caa_unlikely(wduration
))
272 loop_sleep(wduration
);
273 rcu_gc_reclaim(wtidx
, old
);
274 URCU_TLS(nr_writes
)++;
275 if (caa_unlikely(!test_duration_write()))
277 if (caa_unlikely(wdelay
))
281 printf_verbose("thread_end %s, tid %lu\n",
282 "writer", urcu_get_thread_id());
283 tot_nr_writes
[wtidx
] = URCU_TLS(nr_writes
);
287 void show_usage(int argc
, char **argv
)
289 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
291 printf("OPTIONS:\n");
292 printf(" [-r] [-w] (yield reader and/or writer)\n");
293 printf(" [-d delay] (writer period (us))\n");
294 printf(" [-c duration] (reader C.S. duration (in loops))\n");
295 printf(" [-e duration] (writer C.S. duration (in loops))\n");
296 printf(" [-v] (verbose output)\n");
297 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
301 int main(int argc
, char **argv
)
304 pthread_t
*tid_reader
, *tid_writer
;
306 unsigned long long *count_reader
;
307 unsigned long long tot_reads
= 0, tot_writes
= 0;
311 show_usage(argc
, argv
);
315 err
= sscanf(argv
[1], "%u", &nr_readers
);
317 show_usage(argc
, argv
);
321 err
= sscanf(argv
[2], "%u", &nr_writers
);
323 show_usage(argc
, argv
);
327 err
= sscanf(argv
[3], "%lu", &duration
);
329 show_usage(argc
, argv
);
333 for (i
= 4; i
< argc
; i
++) {
334 if (argv
[i
][0] != '-')
336 switch (argv
[i
][1]) {
338 rcu_debug_yield_enable(RCU_YIELD_READ
);
341 rcu_debug_yield_enable(RCU_YIELD_WRITE
);
345 show_usage(argc
, argv
);
349 cpu_affinities
[next_aff
++] = a
;
351 printf_verbose("Adding CPU %d affinity\n", a
);
355 show_usage(argc
, argv
);
358 reclaim_batch
= atol(argv
[++i
]);
362 show_usage(argc
, argv
);
365 rduration
= atol(argv
[++i
]);
369 show_usage(argc
, argv
);
372 wdelay
= atol(argv
[++i
]);
376 show_usage(argc
, argv
);
379 wduration
= atol(argv
[++i
]);
387 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
388 duration
, nr_readers
, nr_writers
);
389 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
390 printf_verbose("Reader duration : %lu loops.\n", rduration
);
391 printf_verbose("thread %-6s, tid %lu\n",
392 "main", urcu_get_thread_id());
394 tid_reader
= calloc(nr_readers
, sizeof(*tid_reader
));
395 tid_writer
= calloc(nr_writers
, sizeof(*tid_writer
));
396 count_reader
= calloc(nr_readers
, sizeof(*count_reader
));
397 tot_nr_writes
= calloc(nr_writers
, sizeof(*tot_nr_writes
));
398 pending_reclaims
= calloc(nr_writers
, sizeof(*pending_reclaims
));
399 if (reclaim_batch
* sizeof(*pending_reclaims
[i
].queue
)
400 < CAA_CACHE_LINE_SIZE
)
401 for (i
= 0; i
< nr_writers
; i
++)
402 pending_reclaims
[i
].queue
= calloc(1, CAA_CACHE_LINE_SIZE
);
404 for (i
= 0; i
< nr_writers
; i
++)
405 pending_reclaims
[i
].queue
= calloc(reclaim_batch
,
406 sizeof(*pending_reclaims
[i
].queue
));
407 for (i
= 0; i
< nr_writers
; i
++)
408 pending_reclaims
[i
].head
= pending_reclaims
[i
].queue
;
412 for (i
= 0; i
< nr_readers
; i
++) {
413 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
418 for (i
= 0; i
< nr_writers
; i
++) {
419 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
433 for (i
= 0; i
< nr_readers
; i
++) {
434 err
= pthread_join(tid_reader
[i
], &tret
);
437 tot_reads
+= count_reader
[i
];
439 for (i
= 0; i
< nr_writers
; i
++) {
440 err
= pthread_join(tid_writer
[i
], &tret
);
443 tot_writes
+= tot_nr_writes
[i
];
444 rcu_gc_clear_queue(i
);
447 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
449 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
451 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
453 argv
[0], duration
, nr_readers
, rduration
, wduration
,
454 nr_writers
, wdelay
, tot_reads
, tot_writes
,
455 tot_reads
+ tot_writes
, reclaim_batch
);
460 for (i
= 0; i
< nr_writers
; i
++)
461 free(pending_reclaims
[i
].queue
);
462 free(pending_reclaims
);