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"
41 /* hardcoded number of CPUs */
44 #ifndef DYNAMIC_LINK_TEST
47 #define rcu_debug_yield_read()
55 static volatile int test_go
, test_stop
;
57 static unsigned long wdelay
;
59 static struct test_array
*test_rcu_pointer
;
61 static unsigned int reclaim_batch
= 1;
63 struct reclaim_queue
{
64 void **queue
; /* Beginning of queue */
65 void **head
; /* Insert position */
68 static struct reclaim_queue
*pending_reclaims
;
70 static unsigned long duration
;
72 /* read-side C.S. duration, in loops */
73 static unsigned long rduration
;
75 /* write-side C.S. duration, in loops */
76 static unsigned long wduration
;
78 static inline void loop_sleep(unsigned long loops
)
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)
100 #if HAVE_SCHED_SETAFFINITY
103 #endif /* HAVE_SCHED_SETAFFINITY */
108 #if HAVE_SCHED_SETAFFINITY
109 ret
= pthread_mutex_lock(&affinity_mutex
);
111 perror("Error in pthread mutex lock");
114 cpu
= cpu_affinities
[next_aff
++];
115 ret
= pthread_mutex_unlock(&affinity_mutex
);
117 perror("Error in pthread mutex unlock");
123 #if SCHED_SETAFFINITY_ARGS == 2
124 sched_setaffinity(0, &mask
);
126 sched_setaffinity(0, sizeof(mask
), &mask
);
128 #endif /* HAVE_SCHED_SETAFFINITY */
132 * returns 0 if test should end.
134 static int test_duration_write(void)
139 static int test_duration_read(void)
144 static DEFINE_URCU_TLS(unsigned long long, nr_writes
);
145 static DEFINE_URCU_TLS(unsigned long long, nr_reads
);
148 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *tot_nr_writes
;
150 static unsigned int nr_readers
;
151 static unsigned int nr_writers
;
153 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
155 void rcu_copy_mutex_lock(void)
158 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
160 perror("Error in pthread mutex lock");
165 void rcu_copy_mutex_unlock(void)
169 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
171 perror("Error in pthread mutex unlock");
176 void *thr_reader(void *_count
)
178 unsigned long long *count
= _count
;
179 struct test_array
*local_ptr
;
181 printf_verbose("thread_begin %s, tid %lu\n",
182 "reader", urcu_get_thread_id());
186 rcu_register_thread();
195 local_ptr
= rcu_dereference(test_rcu_pointer
);
196 rcu_debug_yield_read();
198 assert(local_ptr
->a
== 8);
199 if (caa_unlikely(rduration
))
200 loop_sleep(rduration
);
202 URCU_TLS(nr_reads
)++;
203 if (caa_unlikely(!test_duration_read()))
207 rcu_unregister_thread();
209 *count
= URCU_TLS(nr_reads
);
210 printf_verbose("thread_end %s, tid %lu\n",
211 "reader", urcu_get_thread_id());
216 static void rcu_gc_clear_queue(unsigned long wtidx
)
220 /* Wait for Q.S and empty queue */
223 for (p
= pending_reclaims
[wtidx
].queue
;
224 p
< pending_reclaims
[wtidx
].head
; p
++) {
227 ((struct test_array
*)*p
)->a
= 0;
230 pending_reclaims
[wtidx
].head
= pending_reclaims
[wtidx
].queue
;
233 /* Using per-thread queue */
234 static void rcu_gc_reclaim(unsigned long wtidx
, void *old
)
237 *pending_reclaims
[wtidx
].head
= old
;
238 pending_reclaims
[wtidx
].head
++;
240 if (caa_likely(pending_reclaims
[wtidx
].head
- pending_reclaims
[wtidx
].queue
244 rcu_gc_clear_queue(wtidx
);
247 void *thr_writer(void *data
)
249 unsigned long wtidx
= (unsigned long)data
;
251 struct test_array
*old
= NULL
;
253 struct test_array
*new, *old
;
256 printf_verbose("thread_begin %s, tid %lu\n",
257 "writer", urcu_get_thread_id());
267 #ifndef TEST_LOCAL_GC
268 new = malloc(sizeof(*new));
270 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
272 if (caa_unlikely(wduration
))
273 loop_sleep(wduration
);
274 rcu_gc_reclaim(wtidx
, old
);
275 URCU_TLS(nr_writes
)++;
276 if (caa_unlikely(!test_duration_write()))
278 if (caa_unlikely(wdelay
))
282 printf_verbose("thread_end %s, tid %lu\n",
283 "writer", urcu_get_thread_id());
284 tot_nr_writes
[wtidx
] = URCU_TLS(nr_writes
);
288 void show_usage(int argc
, char **argv
)
290 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
292 printf("OPTIONS:\n");
294 printf(" [-r] [-w] (yield reader and/or writer)\n");
296 printf(" [-d delay] (writer period (us))\n");
297 printf(" [-c duration] (reader C.S. duration (in loops))\n");
298 printf(" [-e duration] (writer C.S. duration (in loops))\n");
299 printf(" [-v] (verbose output)\n");
300 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
304 int main(int argc
, char **argv
)
307 pthread_t
*tid_reader
, *tid_writer
;
309 unsigned long long *count_reader
;
310 unsigned long long tot_reads
= 0, tot_writes
= 0;
314 show_usage(argc
, argv
);
318 err
= sscanf(argv
[1], "%u", &nr_readers
);
320 show_usage(argc
, argv
);
324 err
= sscanf(argv
[2], "%u", &nr_writers
);
326 show_usage(argc
, argv
);
330 err
= sscanf(argv
[3], "%lu", &duration
);
332 show_usage(argc
, argv
);
336 for (i
= 4; i
< argc
; i
++) {
337 if (argv
[i
][0] != '-')
339 switch (argv
[i
][1]) {
342 rcu_yield_active
|= RCU_YIELD_READ
;
345 rcu_yield_active
|= RCU_YIELD_WRITE
;
350 show_usage(argc
, argv
);
354 cpu_affinities
[next_aff
++] = a
;
356 printf_verbose("Adding CPU %d affinity\n", a
);
360 show_usage(argc
, argv
);
363 reclaim_batch
= atol(argv
[++i
]);
367 show_usage(argc
, argv
);
370 rduration
= atol(argv
[++i
]);
374 show_usage(argc
, argv
);
377 wdelay
= atol(argv
[++i
]);
381 show_usage(argc
, argv
);
384 wduration
= atol(argv
[++i
]);
392 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
393 duration
, nr_readers
, nr_writers
);
394 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
395 printf_verbose("Reader duration : %lu loops.\n", rduration
);
396 printf_verbose("thread %-6s, tid %lu\n",
397 "main", urcu_get_thread_id());
399 tid_reader
= calloc(nr_readers
, sizeof(*tid_reader
));
400 tid_writer
= calloc(nr_writers
, sizeof(*tid_writer
));
401 count_reader
= calloc(nr_readers
, sizeof(*count_reader
));
402 tot_nr_writes
= calloc(nr_writers
, sizeof(*tot_nr_writes
));
403 pending_reclaims
= calloc(nr_writers
, sizeof(*pending_reclaims
));
404 if (reclaim_batch
* sizeof(*pending_reclaims
[i
].queue
)
405 < CAA_CACHE_LINE_SIZE
)
406 for (i
= 0; i
< nr_writers
; i
++)
407 pending_reclaims
[i
].queue
= calloc(1, CAA_CACHE_LINE_SIZE
);
409 for (i
= 0; i
< nr_writers
; i
++)
410 pending_reclaims
[i
].queue
= calloc(reclaim_batch
,
411 sizeof(*pending_reclaims
[i
].queue
));
412 for (i
= 0; i
< nr_writers
; i
++)
413 pending_reclaims
[i
].head
= pending_reclaims
[i
].queue
;
417 for (i
= 0; i
< nr_readers
; i
++) {
418 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
423 for (i
= 0; i
< nr_writers
; i
++) {
424 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
438 for (i
= 0; i
< nr_readers
; i
++) {
439 err
= pthread_join(tid_reader
[i
], &tret
);
442 tot_reads
+= count_reader
[i
];
444 for (i
= 0; i
< nr_writers
; i
++) {
445 err
= pthread_join(tid_writer
[i
], &tret
);
448 tot_writes
+= tot_nr_writes
[i
];
449 rcu_gc_clear_queue(i
);
452 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
454 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
456 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
458 argv
[0], duration
, nr_readers
, rduration
, wduration
,
459 nr_writers
, wdelay
, tot_reads
, tot_writes
,
460 tot_reads
+ tot_writes
, reclaim_batch
);
465 for (i
= 0; i
< nr_writers
; i
++)
466 free(pending_reclaims
[i
].queue
);
467 free(pending_reclaims
);