4 * Userspace RCU library - test program (with baatch 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.
24 #include "../config.h"
29 #include <sys/types.h>
36 #include <urcu/arch.h>
37 #include <urcu/tls-compat.h>
44 /* hardcoded number of CPUs */
47 #if defined(_syscall0)
48 _syscall0(pid_t
, gettid
)
49 #elif defined(__NR_gettid)
50 static inline pid_t
gettid(void)
52 return syscall(__NR_gettid
);
55 #warning "use pid as tid"
56 static inline pid_t
gettid(void)
62 #ifndef DYNAMIC_LINK_TEST
65 #define debug_yield_read()
73 static volatile int test_go
, test_stop
;
75 static unsigned long wdelay
;
77 static struct test_array
*test_rcu_pointer
;
79 static unsigned int reclaim_batch
= 1;
81 struct reclaim_queue
{
82 void **queue
; /* Beginning of queue */
83 void **head
; /* Insert position */
86 static struct reclaim_queue
*pending_reclaims
;
88 static unsigned long duration
;
90 /* read-side C.S. duration, in loops */
91 static unsigned long rduration
;
93 /* write-side C.S. duration, in loops */
94 static unsigned long wduration
;
96 static inline void loop_sleep(unsigned long l
)
102 static int verbose_mode
;
104 #define printf_verbose(fmt, args...) \
110 static unsigned int cpu_affinities
[NR_CPUS
];
111 static unsigned int next_aff
= 0;
112 static int use_affinity
= 0;
114 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
116 static void set_affinity(void)
125 #if HAVE_SCHED_SETAFFINITY
126 ret
= pthread_mutex_lock(&affinity_mutex
);
128 perror("Error in pthread mutex lock");
131 cpu
= cpu_affinities
[next_aff
++];
132 ret
= pthread_mutex_unlock(&affinity_mutex
);
134 perror("Error in pthread mutex unlock");
140 #if SCHED_SETAFFINITY_ARGS == 2
141 sched_setaffinity(0, &mask
);
143 sched_setaffinity(0, sizeof(mask
), &mask
);
145 #endif /* HAVE_SCHED_SETAFFINITY */
149 * returns 0 if test should end.
151 static int test_duration_write(void)
156 static int test_duration_read(void)
161 static DEFINE_URCU_TLS(unsigned long long, nr_writes
);
162 static DEFINE_URCU_TLS(unsigned long long, nr_reads
);
165 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *tot_nr_writes
;
167 static unsigned int nr_readers
;
168 static unsigned int nr_writers
;
170 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
172 void rcu_copy_mutex_lock(void)
175 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
177 perror("Error in pthread mutex lock");
182 void rcu_copy_mutex_unlock(void)
186 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
188 perror("Error in pthread mutex unlock");
193 void *thr_reader(void *_count
)
195 unsigned long long *count
= _count
;
196 struct test_array
*local_ptr
;
198 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
199 "reader", (unsigned long) pthread_self(),
200 (unsigned long) gettid());
204 rcu_register_thread();
213 local_ptr
= rcu_dereference(test_rcu_pointer
);
216 assert(local_ptr
->a
== 8);
217 if (caa_unlikely(rduration
))
218 loop_sleep(rduration
);
220 URCU_TLS(nr_reads
)++;
221 if (caa_unlikely(!test_duration_read()))
225 rcu_unregister_thread();
227 *count
= URCU_TLS(nr_reads
);
228 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
229 "reader", (unsigned long) pthread_self(),
230 (unsigned long) gettid());
235 static void rcu_gc_clear_queue(unsigned long wtidx
)
239 /* Wait for Q.S and empty queue */
242 for (p
= pending_reclaims
[wtidx
].queue
;
243 p
< pending_reclaims
[wtidx
].head
; p
++) {
246 ((struct test_array
*)*p
)->a
= 0;
249 pending_reclaims
[wtidx
].head
= pending_reclaims
[wtidx
].queue
;
252 /* Using per-thread queue */
253 static void rcu_gc_reclaim(unsigned long wtidx
, void *old
)
256 *pending_reclaims
[wtidx
].head
= old
;
257 pending_reclaims
[wtidx
].head
++;
259 if (caa_likely(pending_reclaims
[wtidx
].head
- pending_reclaims
[wtidx
].queue
263 rcu_gc_clear_queue(wtidx
);
266 void *thr_writer(void *data
)
268 unsigned long wtidx
= (unsigned long)data
;
270 struct test_array
*old
= NULL
;
272 struct test_array
*new, *old
;
275 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
276 "writer", (unsigned long) pthread_self(),
277 (unsigned long) gettid());
287 #ifndef TEST_LOCAL_GC
288 new = malloc(sizeof(*new));
290 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
292 if (caa_unlikely(wduration
))
293 loop_sleep(wduration
);
294 rcu_gc_reclaim(wtidx
, old
);
295 URCU_TLS(nr_writes
)++;
296 if (caa_unlikely(!test_duration_write()))
298 if (caa_unlikely(wdelay
))
302 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
303 "writer", (unsigned long) pthread_self(),
304 (unsigned long) gettid());
305 tot_nr_writes
[wtidx
] = URCU_TLS(nr_writes
);
309 void show_usage(int argc
, char **argv
)
311 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
313 printf(" [-r] [-w] (yield reader and/or writer)");
315 printf(" [-d delay] (writer period (us))");
316 printf(" [-c duration] (reader C.S. duration (in loops))");
317 printf(" [-e duration] (writer C.S. duration (in loops))");
318 printf(" [-v] (verbose output)");
319 printf(" [-a cpu#] [-a cpu#]... (affinity)");
323 int main(int argc
, char **argv
)
326 pthread_t
*tid_reader
, *tid_writer
;
328 unsigned long long *count_reader
;
329 unsigned long long tot_reads
= 0, tot_writes
= 0;
333 show_usage(argc
, argv
);
337 err
= sscanf(argv
[1], "%u", &nr_readers
);
339 show_usage(argc
, argv
);
343 err
= sscanf(argv
[2], "%u", &nr_writers
);
345 show_usage(argc
, argv
);
349 err
= sscanf(argv
[3], "%lu", &duration
);
351 show_usage(argc
, argv
);
355 for (i
= 4; i
< argc
; i
++) {
356 if (argv
[i
][0] != '-')
358 switch (argv
[i
][1]) {
361 yield_active
|= YIELD_READ
;
364 yield_active
|= YIELD_WRITE
;
369 show_usage(argc
, argv
);
373 cpu_affinities
[next_aff
++] = a
;
375 printf_verbose("Adding CPU %d affinity\n", a
);
379 show_usage(argc
, argv
);
382 reclaim_batch
= atol(argv
[++i
]);
386 show_usage(argc
, argv
);
389 rduration
= atol(argv
[++i
]);
393 show_usage(argc
, argv
);
396 wdelay
= atol(argv
[++i
]);
400 show_usage(argc
, argv
);
403 wduration
= atol(argv
[++i
]);
411 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
412 duration
, nr_readers
, nr_writers
);
413 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
414 printf_verbose("Reader duration : %lu loops.\n", rduration
);
415 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
416 "main", (unsigned long) pthread_self(),
417 (unsigned long) gettid());
419 tid_reader
= calloc(nr_readers
, sizeof(*tid_reader
));
420 tid_writer
= calloc(nr_writers
, sizeof(*tid_writer
));
421 count_reader
= calloc(nr_readers
, sizeof(*count_reader
));
422 tot_nr_writes
= calloc(nr_writers
, sizeof(*tot_nr_writes
));
423 pending_reclaims
= calloc(nr_writers
, sizeof(*pending_reclaims
));
424 if (reclaim_batch
* sizeof(*pending_reclaims
[i
].queue
)
425 < CAA_CACHE_LINE_SIZE
)
426 for (i
= 0; i
< nr_writers
; i
++)
427 pending_reclaims
[i
].queue
= calloc(1, CAA_CACHE_LINE_SIZE
);
429 for (i
= 0; i
< nr_writers
; i
++)
430 pending_reclaims
[i
].queue
= calloc(reclaim_batch
,
431 sizeof(*pending_reclaims
[i
].queue
));
432 for (i
= 0; i
< nr_writers
; i
++)
433 pending_reclaims
[i
].head
= pending_reclaims
[i
].queue
;
437 for (i
= 0; i
< nr_readers
; i
++) {
438 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
443 for (i
= 0; i
< nr_writers
; i
++) {
444 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
458 for (i
= 0; i
< nr_readers
; i
++) {
459 err
= pthread_join(tid_reader
[i
], &tret
);
462 tot_reads
+= count_reader
[i
];
464 for (i
= 0; i
< nr_writers
; i
++) {
465 err
= pthread_join(tid_writer
[i
], &tret
);
468 tot_writes
+= tot_nr_writes
[i
];
469 rcu_gc_clear_queue(i
);
472 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
474 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
476 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
478 argv
[0], duration
, nr_readers
, rduration
, wduration
,
479 nr_writers
, wdelay
, tot_reads
, tot_writes
,
480 tot_reads
+ tot_writes
, reclaim_batch
);
485 for (i
= 0; i
< nr_writers
; i
++)
486 free(pending_reclaims
[i
].queue
);
487 free(pending_reclaims
);