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.
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
52 static volatile int test_go
, test_stop
;
54 static unsigned long wdelay
;
56 static struct test_array
*test_rcu_pointer
;
58 static unsigned int reclaim_batch
= 1;
60 struct reclaim_queue
{
61 void **queue
; /* Beginning of queue */
62 void **head
; /* Insert position */
65 static struct reclaim_queue
*pending_reclaims
;
67 static unsigned long duration
;
69 /* read-side C.S. duration, in loops */
70 static unsigned long rduration
;
72 /* write-side C.S. duration, in loops */
73 static unsigned long wduration
;
75 static inline void loop_sleep(unsigned long loops
)
81 static int verbose_mode
;
83 #define printf_verbose(fmt, args...) \
89 static unsigned int cpu_affinities
[NR_CPUS
];
90 static unsigned int next_aff
= 0;
91 static int use_affinity
= 0;
93 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
95 static void set_affinity(void)
97 #if HAVE_SCHED_SETAFFINITY
100 #endif /* HAVE_SCHED_SETAFFINITY */
105 #if HAVE_SCHED_SETAFFINITY
106 ret
= pthread_mutex_lock(&affinity_mutex
);
108 perror("Error in pthread mutex lock");
111 cpu
= cpu_affinities
[next_aff
++];
112 ret
= pthread_mutex_unlock(&affinity_mutex
);
114 perror("Error in pthread mutex unlock");
120 #if SCHED_SETAFFINITY_ARGS == 2
121 sched_setaffinity(0, &mask
);
123 sched_setaffinity(0, sizeof(mask
), &mask
);
125 #endif /* HAVE_SCHED_SETAFFINITY */
129 * returns 0 if test should end.
131 static int test_duration_write(void)
136 static int test_duration_read(void)
141 static DEFINE_URCU_TLS(unsigned long long, nr_writes
);
142 static DEFINE_URCU_TLS(unsigned long long, nr_reads
);
145 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *tot_nr_writes
;
147 static unsigned int nr_readers
;
148 static unsigned int nr_writers
;
150 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
152 void rcu_copy_mutex_lock(void)
155 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
157 perror("Error in pthread mutex lock");
162 void rcu_copy_mutex_unlock(void)
166 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
168 perror("Error in pthread mutex unlock");
173 void *thr_reader(void *_count
)
175 unsigned long long *count
= _count
;
176 struct test_array
*local_ptr
;
178 printf_verbose("thread_begin %s, tid %lu\n",
179 "reader", urcu_get_thread_id());
183 rcu_register_thread();
192 local_ptr
= rcu_dereference(test_rcu_pointer
);
193 rcu_debug_yield_read();
195 assert(local_ptr
->a
== 8);
196 if (caa_unlikely(rduration
))
197 loop_sleep(rduration
);
199 URCU_TLS(nr_reads
)++;
200 if (caa_unlikely(!test_duration_read()))
204 rcu_unregister_thread();
206 *count
= URCU_TLS(nr_reads
);
207 printf_verbose("thread_end %s, tid %lu\n",
208 "reader", urcu_get_thread_id());
213 static void rcu_gc_clear_queue(unsigned long wtidx
)
217 /* Wait for Q.S and empty queue */
220 for (p
= pending_reclaims
[wtidx
].queue
;
221 p
< pending_reclaims
[wtidx
].head
; p
++) {
224 ((struct test_array
*)*p
)->a
= 0;
227 pending_reclaims
[wtidx
].head
= pending_reclaims
[wtidx
].queue
;
230 /* Using per-thread queue */
231 static void rcu_gc_reclaim(unsigned long wtidx
, void *old
)
234 *pending_reclaims
[wtidx
].head
= old
;
235 pending_reclaims
[wtidx
].head
++;
237 if (caa_likely(pending_reclaims
[wtidx
].head
- pending_reclaims
[wtidx
].queue
241 rcu_gc_clear_queue(wtidx
);
244 void *thr_writer(void *data
)
246 unsigned long wtidx
= (unsigned long)data
;
248 struct test_array
*old
= NULL
;
250 struct test_array
*new, *old
;
253 printf_verbose("thread_begin %s, tid %lu\n",
254 "writer", urcu_get_thread_id());
264 #ifndef TEST_LOCAL_GC
265 new = malloc(sizeof(*new));
267 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
269 if (caa_unlikely(wduration
))
270 loop_sleep(wduration
);
271 rcu_gc_reclaim(wtidx
, old
);
272 URCU_TLS(nr_writes
)++;
273 if (caa_unlikely(!test_duration_write()))
275 if (caa_unlikely(wdelay
))
279 printf_verbose("thread_end %s, tid %lu\n",
280 "writer", urcu_get_thread_id());
281 tot_nr_writes
[wtidx
] = URCU_TLS(nr_writes
);
285 void show_usage(int argc
, char **argv
)
287 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
289 printf("OPTIONS:\n");
290 printf(" [-r] [-w] (yield reader and/or writer)\n");
291 printf(" [-d delay] (writer period (us))\n");
292 printf(" [-c duration] (reader C.S. duration (in loops))\n");
293 printf(" [-e duration] (writer C.S. duration (in loops))\n");
294 printf(" [-v] (verbose output)\n");
295 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
299 int main(int argc
, char **argv
)
302 pthread_t
*tid_reader
, *tid_writer
;
304 unsigned long long *count_reader
;
305 unsigned long long tot_reads
= 0, tot_writes
= 0;
310 show_usage(argc
, argv
);
314 err
= sscanf(argv
[1], "%u", &nr_readers
);
316 show_usage(argc
, argv
);
320 err
= sscanf(argv
[2], "%u", &nr_writers
);
322 show_usage(argc
, argv
);
326 err
= sscanf(argv
[3], "%lu", &duration
);
328 show_usage(argc
, argv
);
332 for (i
= 4; i
< argc
; i
++) {
333 if (argv
[i
][0] != '-')
335 switch (argv
[i
][1]) {
337 rcu_debug_yield_enable(RCU_YIELD_READ
);
340 rcu_debug_yield_enable(RCU_YIELD_WRITE
);
344 show_usage(argc
, argv
);
348 cpu_affinities
[next_aff
++] = a
;
350 printf_verbose("Adding CPU %d affinity\n", a
);
354 show_usage(argc
, argv
);
357 reclaim_batch
= atol(argv
[++i
]);
361 show_usage(argc
, argv
);
364 rduration
= atol(argv
[++i
]);
368 show_usage(argc
, argv
);
371 wdelay
= atol(argv
[++i
]);
375 show_usage(argc
, argv
);
378 wduration
= atol(argv
[++i
]);
386 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
387 duration
, nr_readers
, nr_writers
);
388 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
389 printf_verbose("Reader duration : %lu loops.\n", rduration
);
390 printf_verbose("thread %-6s, tid %lu\n",
391 "main", urcu_get_thread_id());
393 tid_reader
= calloc(nr_readers
, sizeof(*tid_reader
));
394 tid_writer
= calloc(nr_writers
, sizeof(*tid_writer
));
395 count_reader
= calloc(nr_readers
, sizeof(*count_reader
));
396 tot_nr_writes
= calloc(nr_writers
, sizeof(*tot_nr_writes
));
397 pending_reclaims
= calloc(nr_writers
, sizeof(*pending_reclaims
));
399 if (reclaim_batch
* sizeof(*pending_reclaims
[0].queue
)
400 < CAA_CACHE_LINE_SIZE
)
401 for (i_thr
= 0; i_thr
< nr_writers
; i_thr
++)
402 pending_reclaims
[i_thr
].queue
= calloc(1, CAA_CACHE_LINE_SIZE
);
404 for (i_thr
= 0; i_thr
< nr_writers
; i_thr
++)
405 pending_reclaims
[i_thr
].queue
= calloc(reclaim_batch
,
406 sizeof(*pending_reclaims
[i_thr
].queue
));
407 for (i_thr
= 0; i_thr
< nr_writers
; i_thr
++)
408 pending_reclaims
[i_thr
].head
= pending_reclaims
[i_thr
].queue
;
412 for (i_thr
= 0; i_thr
< nr_readers
; i_thr
++) {
413 err
= pthread_create(&tid_reader
[i_thr
], NULL
, thr_reader
,
414 &count_reader
[i_thr
]);
418 for (i_thr
= 0; i_thr
< nr_writers
; i_thr
++) {
419 err
= pthread_create(&tid_writer
[i_thr
], NULL
, thr_writer
,
420 (void *)(long)i_thr
);
433 for (i_thr
= 0; i_thr
< nr_readers
; i_thr
++) {
434 err
= pthread_join(tid_reader
[i_thr
], &tret
);
437 tot_reads
+= count_reader
[i_thr
];
439 for (i_thr
= 0; i_thr
< nr_writers
; i_thr
++) {
440 err
= pthread_join(tid_writer
[i_thr
], &tret
);
443 tot_writes
+= tot_nr_writes
[i_thr
];
444 rcu_gc_clear_queue(i_thr
);
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
);
462 for (i_thr
= 0; i_thr
< nr_writers
; i_thr
++)
463 free(pending_reclaims
[i_thr
].queue
);
464 free(pending_reclaims
);