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 loops
)
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)
124 #if HAVE_SCHED_SETAFFINITY
127 #endif /* HAVE_SCHED_SETAFFINITY */
132 #if HAVE_SCHED_SETAFFINITY
133 ret
= pthread_mutex_lock(&affinity_mutex
);
135 perror("Error in pthread mutex lock");
138 cpu
= cpu_affinities
[next_aff
++];
139 ret
= pthread_mutex_unlock(&affinity_mutex
);
141 perror("Error in pthread mutex unlock");
147 #if SCHED_SETAFFINITY_ARGS == 2
148 sched_setaffinity(0, &mask
);
150 sched_setaffinity(0, sizeof(mask
), &mask
);
152 #endif /* HAVE_SCHED_SETAFFINITY */
156 * returns 0 if test should end.
158 static int test_duration_write(void)
163 static int test_duration_read(void)
168 static DEFINE_URCU_TLS(unsigned long long, nr_writes
);
169 static DEFINE_URCU_TLS(unsigned long long, nr_reads
);
172 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *tot_nr_writes
;
174 static unsigned int nr_readers
;
175 static unsigned int nr_writers
;
177 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
179 void rcu_copy_mutex_lock(void)
182 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
184 perror("Error in pthread mutex lock");
189 void rcu_copy_mutex_unlock(void)
193 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
195 perror("Error in pthread mutex unlock");
200 void *thr_reader(void *_count
)
202 unsigned long long *count
= _count
;
203 struct test_array
*local_ptr
;
205 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
206 "reader", pthread_self(), (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", pthread_self(), (unsigned long)gettid());
240 static void rcu_gc_clear_queue(unsigned long wtidx
)
244 /* Wait for Q.S and empty queue */
247 for (p
= pending_reclaims
[wtidx
].queue
;
248 p
< pending_reclaims
[wtidx
].head
; p
++) {
251 ((struct test_array
*)*p
)->a
= 0;
254 pending_reclaims
[wtidx
].head
= pending_reclaims
[wtidx
].queue
;
257 /* Using per-thread queue */
258 static void rcu_gc_reclaim(unsigned long wtidx
, void *old
)
261 *pending_reclaims
[wtidx
].head
= old
;
262 pending_reclaims
[wtidx
].head
++;
264 if (caa_likely(pending_reclaims
[wtidx
].head
- pending_reclaims
[wtidx
].queue
268 rcu_gc_clear_queue(wtidx
);
271 void *thr_writer(void *data
)
273 unsigned long wtidx
= (unsigned long)data
;
275 struct test_array
*old
= NULL
;
277 struct test_array
*new, *old
;
280 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
281 "writer", pthread_self(), (unsigned long)gettid());
291 #ifndef TEST_LOCAL_GC
292 new = malloc(sizeof(*new));
294 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
296 if (caa_unlikely(wduration
))
297 loop_sleep(wduration
);
298 rcu_gc_reclaim(wtidx
, old
);
299 URCU_TLS(nr_writes
)++;
300 if (caa_unlikely(!test_duration_write()))
302 if (caa_unlikely(wdelay
))
306 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
307 "writer", pthread_self(), (unsigned long)gettid());
308 tot_nr_writes
[wtidx
] = URCU_TLS(nr_writes
);
312 void show_usage(int argc
, char **argv
)
314 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
316 printf(" [-r] [-w] (yield reader and/or writer)");
318 printf(" [-d delay] (writer period (us))");
319 printf(" [-c duration] (reader C.S. duration (in loops))");
320 printf(" [-e duration] (writer C.S. duration (in loops))");
321 printf(" [-v] (verbose output)");
322 printf(" [-a cpu#] [-a cpu#]... (affinity)");
326 int main(int argc
, char **argv
)
329 pthread_t
*tid_reader
, *tid_writer
;
331 unsigned long long *count_reader
;
332 unsigned long long tot_reads
= 0, tot_writes
= 0;
336 show_usage(argc
, argv
);
340 err
= sscanf(argv
[1], "%u", &nr_readers
);
342 show_usage(argc
, argv
);
346 err
= sscanf(argv
[2], "%u", &nr_writers
);
348 show_usage(argc
, argv
);
352 err
= sscanf(argv
[3], "%lu", &duration
);
354 show_usage(argc
, argv
);
358 for (i
= 4; i
< argc
; i
++) {
359 if (argv
[i
][0] != '-')
361 switch (argv
[i
][1]) {
364 yield_active
|= YIELD_READ
;
367 yield_active
|= YIELD_WRITE
;
372 show_usage(argc
, argv
);
376 cpu_affinities
[next_aff
++] = a
;
378 printf_verbose("Adding CPU %d affinity\n", a
);
382 show_usage(argc
, argv
);
385 reclaim_batch
= atol(argv
[++i
]);
389 show_usage(argc
, argv
);
392 rduration
= atol(argv
[++i
]);
396 show_usage(argc
, argv
);
399 wdelay
= atol(argv
[++i
]);
403 show_usage(argc
, argv
);
406 wduration
= atol(argv
[++i
]);
414 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
415 duration
, nr_readers
, nr_writers
);
416 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
417 printf_verbose("Reader duration : %lu loops.\n", rduration
);
418 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
419 "main", pthread_self(), (unsigned long)gettid());
421 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
422 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
423 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
424 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
425 pending_reclaims
= malloc(sizeof(*pending_reclaims
) * nr_writers
);
426 if (reclaim_batch
* sizeof(*pending_reclaims
[i
].queue
)
427 < CAA_CACHE_LINE_SIZE
)
428 for (i
= 0; i
< nr_writers
; i
++)
429 pending_reclaims
[i
].queue
= calloc(1, CAA_CACHE_LINE_SIZE
);
431 for (i
= 0; i
< nr_writers
; i
++)
432 pending_reclaims
[i
].queue
= calloc(reclaim_batch
,
433 sizeof(*pending_reclaims
[i
].queue
));
434 for (i
= 0; i
< nr_writers
; i
++)
435 pending_reclaims
[i
].head
= pending_reclaims
[i
].queue
;
439 for (i
= 0; i
< nr_readers
; i
++) {
440 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
445 for (i
= 0; i
< nr_writers
; i
++) {
446 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
460 for (i
= 0; i
< nr_readers
; i
++) {
461 err
= pthread_join(tid_reader
[i
], &tret
);
464 tot_reads
+= count_reader
[i
];
466 for (i
= 0; i
< nr_writers
; i
++) {
467 err
= pthread_join(tid_writer
[i
], &tret
);
470 tot_writes
+= tot_nr_writes
[i
];
471 rcu_gc_clear_queue(i
);
474 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
476 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
478 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
480 argv
[0], duration
, nr_readers
, rduration
, wduration
,
481 nr_writers
, wdelay
, tot_reads
, tot_writes
,
482 tot_reads
+ tot_writes
, reclaim_batch
);
487 for (i
= 0; i
< nr_writers
; i
++)
488 free(pending_reclaims
[i
].queue
);
489 free(pending_reclaims
);