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>
37 #include <urcu/arch.h>
38 #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 #ifndef HAVE_CPU_SET_T
117 typedef unsigned long cpu_set_t
;
118 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
119 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
122 static void set_affinity(void)
131 #if HAVE_SCHED_SETAFFINITY
132 ret
= pthread_mutex_lock(&affinity_mutex
);
134 perror("Error in pthread mutex lock");
137 cpu
= cpu_affinities
[next_aff
++];
138 ret
= pthread_mutex_unlock(&affinity_mutex
);
140 perror("Error in pthread mutex unlock");
146 #if SCHED_SETAFFINITY_ARGS == 2
147 sched_setaffinity(0, &mask
);
149 sched_setaffinity(0, sizeof(mask
), &mask
);
151 #endif /* HAVE_SCHED_SETAFFINITY */
155 * returns 0 if test should end.
157 static int test_duration_write(void)
162 static int test_duration_read(void)
167 static DEFINE_URCU_TLS(unsigned long long, nr_writes
);
168 static DEFINE_URCU_TLS(unsigned long long, nr_reads
);
171 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *tot_nr_writes
;
173 static unsigned int nr_readers
;
174 static unsigned int nr_writers
;
176 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
178 void rcu_copy_mutex_lock(void)
181 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
183 perror("Error in pthread mutex lock");
188 void rcu_copy_mutex_unlock(void)
192 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
194 perror("Error in pthread mutex unlock");
199 void *thr_reader(void *_count
)
201 unsigned long long *count
= _count
;
202 struct test_array
*local_ptr
;
204 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
205 "reader", (unsigned long) pthread_self(),
206 (unsigned long) gettid());
210 rcu_register_thread();
219 local_ptr
= rcu_dereference(test_rcu_pointer
);
222 assert(local_ptr
->a
== 8);
223 if (caa_unlikely(rduration
))
224 loop_sleep(rduration
);
226 URCU_TLS(nr_reads
)++;
227 if (caa_unlikely(!test_duration_read()))
231 rcu_unregister_thread();
233 *count
= URCU_TLS(nr_reads
);
234 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
235 "reader", (unsigned long) pthread_self(),
236 (unsigned long) gettid());
241 static void rcu_gc_clear_queue(unsigned long wtidx
)
245 /* Wait for Q.S and empty queue */
248 for (p
= pending_reclaims
[wtidx
].queue
;
249 p
< pending_reclaims
[wtidx
].head
; p
++) {
252 ((struct test_array
*)*p
)->a
= 0;
255 pending_reclaims
[wtidx
].head
= pending_reclaims
[wtidx
].queue
;
258 /* Using per-thread queue */
259 static void rcu_gc_reclaim(unsigned long wtidx
, void *old
)
262 *pending_reclaims
[wtidx
].head
= old
;
263 pending_reclaims
[wtidx
].head
++;
265 if (caa_likely(pending_reclaims
[wtidx
].head
- pending_reclaims
[wtidx
].queue
269 rcu_gc_clear_queue(wtidx
);
272 void *thr_writer(void *data
)
274 unsigned long wtidx
= (unsigned long)data
;
276 struct test_array
*old
= NULL
;
278 struct test_array
*new, *old
;
281 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
282 "writer", (unsigned long) pthread_self(),
283 (unsigned long) gettid());
293 #ifndef TEST_LOCAL_GC
294 new = malloc(sizeof(*new));
296 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
298 if (caa_unlikely(wduration
))
299 loop_sleep(wduration
);
300 rcu_gc_reclaim(wtidx
, old
);
301 URCU_TLS(nr_writes
)++;
302 if (caa_unlikely(!test_duration_write()))
304 if (caa_unlikely(wdelay
))
308 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
309 "writer", (unsigned long) pthread_self(),
310 (unsigned long) gettid());
311 tot_nr_writes
[wtidx
] = URCU_TLS(nr_writes
);
315 void show_usage(int argc
, char **argv
)
317 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
319 printf(" [-r] [-w] (yield reader and/or writer)");
321 printf(" [-d delay] (writer period (us))");
322 printf(" [-c duration] (reader C.S. duration (in loops))");
323 printf(" [-e duration] (writer C.S. duration (in loops))");
324 printf(" [-v] (verbose output)");
325 printf(" [-a cpu#] [-a cpu#]... (affinity)");
329 int main(int argc
, char **argv
)
332 pthread_t
*tid_reader
, *tid_writer
;
334 unsigned long long *count_reader
;
335 unsigned long long tot_reads
= 0, tot_writes
= 0;
339 show_usage(argc
, argv
);
343 err
= sscanf(argv
[1], "%u", &nr_readers
);
345 show_usage(argc
, argv
);
349 err
= sscanf(argv
[2], "%u", &nr_writers
);
351 show_usage(argc
, argv
);
355 err
= sscanf(argv
[3], "%lu", &duration
);
357 show_usage(argc
, argv
);
361 for (i
= 4; i
< argc
; i
++) {
362 if (argv
[i
][0] != '-')
364 switch (argv
[i
][1]) {
367 yield_active
|= YIELD_READ
;
370 yield_active
|= YIELD_WRITE
;
375 show_usage(argc
, argv
);
379 cpu_affinities
[next_aff
++] = a
;
381 printf_verbose("Adding CPU %d affinity\n", a
);
385 show_usage(argc
, argv
);
388 reclaim_batch
= atol(argv
[++i
]);
392 show_usage(argc
, argv
);
395 rduration
= atol(argv
[++i
]);
399 show_usage(argc
, argv
);
402 wdelay
= atol(argv
[++i
]);
406 show_usage(argc
, argv
);
409 wduration
= atol(argv
[++i
]);
417 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
418 duration
, nr_readers
, nr_writers
);
419 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
420 printf_verbose("Reader duration : %lu loops.\n", rduration
);
421 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
422 "main", (unsigned long) pthread_self(),
423 (unsigned long) gettid());
425 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
426 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
427 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
428 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
429 pending_reclaims
= malloc(sizeof(*pending_reclaims
) * nr_writers
);
430 if (reclaim_batch
* sizeof(*pending_reclaims
[i
].queue
)
431 < CAA_CACHE_LINE_SIZE
)
432 for (i
= 0; i
< nr_writers
; i
++)
433 pending_reclaims
[i
].queue
= calloc(1, CAA_CACHE_LINE_SIZE
);
435 for (i
= 0; i
< nr_writers
; i
++)
436 pending_reclaims
[i
].queue
= calloc(reclaim_batch
,
437 sizeof(*pending_reclaims
[i
].queue
));
438 for (i
= 0; i
< nr_writers
; i
++)
439 pending_reclaims
[i
].head
= pending_reclaims
[i
].queue
;
443 for (i
= 0; i
< nr_readers
; i
++) {
444 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
449 for (i
= 0; i
< nr_writers
; i
++) {
450 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
464 for (i
= 0; i
< nr_readers
; i
++) {
465 err
= pthread_join(tid_reader
[i
], &tret
);
468 tot_reads
+= count_reader
[i
];
470 for (i
= 0; i
< nr_writers
; i
++) {
471 err
= pthread_join(tid_writer
[i
], &tret
);
474 tot_writes
+= tot_nr_writes
[i
];
475 rcu_gc_clear_queue(i
);
478 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
480 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
482 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
484 argv
[0], duration
, nr_readers
, rduration
, wduration
,
485 nr_writers
, wdelay
, tot_reads
, tot_writes
,
486 tot_reads
+ tot_writes
, reclaim_batch
);
491 for (i
= 0; i
< nr_writers
; i
++)
492 free(pending_reclaims
[i
].queue
);
493 free(pending_reclaims
);