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>
34 #include <sys/syscall.h>
38 #include <urcu/arch.h>
40 /* hardcoded number of CPUs */
43 #if defined(_syscall0)
44 _syscall0(pid_t
, gettid
)
45 #elif defined(__NR_gettid)
46 static inline pid_t
gettid(void)
48 return syscall(__NR_gettid
);
51 #warning "use pid as tid"
52 static inline pid_t
gettid(void)
59 #include <urcu-qsbr.h>
65 static volatile int test_go
, test_stop
;
67 static unsigned long wdelay
;
69 static struct test_array
*test_rcu_pointer
;
71 static unsigned long duration
;
73 /* read-side C.S. duration, in loops */
74 static unsigned long rduration
;
75 static unsigned int reclaim_batch
= 1;
77 struct reclaim_queue
{
78 void **queue
; /* Beginning of queue */
79 void **head
; /* Insert position */
82 static struct reclaim_queue
*pending_reclaims
;
85 /* write-side C.S. duration, in loops */
86 static unsigned long wduration
;
88 static inline void loop_sleep(unsigned long l
)
94 static int verbose_mode
;
96 #define printf_verbose(fmt, args...) \
102 static unsigned int cpu_affinities
[NR_CPUS
];
103 static unsigned int next_aff
= 0;
104 static int use_affinity
= 0;
106 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
108 #ifndef HAVE_CPU_SET_T
109 typedef unsigned long cpu_set_t
;
110 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
111 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
114 static void set_affinity(void)
123 #if HAVE_SCHED_SETAFFINITY
124 ret
= pthread_mutex_lock(&affinity_mutex
);
126 perror("Error in pthread mutex lock");
129 cpu
= cpu_affinities
[next_aff
++];
130 ret
= pthread_mutex_unlock(&affinity_mutex
);
132 perror("Error in pthread mutex unlock");
138 #if SCHED_SETAFFINITY_ARGS == 2
139 sched_setaffinity(0, &mask
);
141 sched_setaffinity(0, sizeof(mask
), &mask
);
143 #endif /* HAVE_SCHED_SETAFFINITY */
147 * returns 0 if test should end.
149 static int test_duration_write(void)
154 static int test_duration_read(void)
159 static unsigned long long __thread nr_writes
;
160 static unsigned long long __thread nr_reads
;
162 static unsigned int nr_readers
;
163 static unsigned int nr_writers
;
165 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
167 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *tot_nr_writes
;
170 void rcu_copy_mutex_lock(void)
173 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
175 perror("Error in pthread mutex lock");
180 void rcu_copy_mutex_unlock(void)
184 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
186 perror("Error in pthread mutex unlock");
191 void *thr_reader(void *_count
)
193 unsigned long long *count
= _count
;
194 struct test_array
*local_ptr
;
196 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
197 "reader", pthread_self(), (unsigned long)gettid());
201 rcu_register_thread();
210 local_ptr
= _rcu_dereference(test_rcu_pointer
);
213 assert(local_ptr
->a
== 8);
214 if (unlikely(rduration
))
215 loop_sleep(rduration
);
218 /* QS each 1024 reads */
219 if (unlikely((nr_reads
& ((1 << 10) - 1)) == 0))
220 _rcu_quiescent_state();
221 if (unlikely(!test_duration_read()))
225 rcu_unregister_thread();
228 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
229 "reader", pthread_self(), (unsigned long)gettid());
234 static void rcu_gc_clear_queue(unsigned long wtidx
)
238 /* Wait for Q.S and empty queue */
241 for (p
= pending_reclaims
[wtidx
].queue
;
242 p
< pending_reclaims
[wtidx
].head
; p
++) {
245 ((struct test_array
*)*p
)->a
= 0;
248 pending_reclaims
[wtidx
].head
= pending_reclaims
[wtidx
].queue
;
251 /* Using per-thread queue */
252 static void rcu_gc_reclaim(unsigned long wtidx
, void *old
)
255 *pending_reclaims
[wtidx
].head
= old
;
256 pending_reclaims
[wtidx
].head
++;
258 if (likely(pending_reclaims
[wtidx
].head
- pending_reclaims
[wtidx
].queue
262 rcu_gc_clear_queue(wtidx
);
265 void *thr_writer(void *data
)
267 unsigned long wtidx
= (unsigned long)data
;
269 struct test_array
*old
= NULL
;
271 struct test_array
*new, *old
;
274 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
275 "writer", pthread_self(), (unsigned long)gettid());
285 #ifndef TEST_LOCAL_GC
286 new = malloc(sizeof(*new));
288 old
= _rcu_xchg_pointer(&test_rcu_pointer
, new);
290 if (unlikely(wduration
))
291 loop_sleep(wduration
);
292 rcu_gc_reclaim(wtidx
, old
);
294 if (unlikely(!test_duration_write()))
296 if (unlikely(wdelay
))
300 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
301 "writer", pthread_self(), (unsigned long)gettid());
302 tot_nr_writes
[wtidx
] = nr_writes
;
306 void show_usage(int argc
, char **argv
)
308 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
310 printf(" [-r] [-w] (yield reader and/or writer)");
312 printf(" [-b batch] (batch reclaim)");
313 printf(" [-d delay] (writer period (us))");
314 printf(" [-c duration] (reader C.S. duration (in loops))");
315 printf(" [-e duration] (writer C.S. duration (in loops))");
316 printf(" [-v] (verbose output)");
317 printf(" [-a cpu#] [-a cpu#]... (affinity)");
321 int main(int argc
, char **argv
)
324 pthread_t
*tid_reader
, *tid_writer
;
326 unsigned long long *count_reader
;
327 unsigned long long tot_reads
= 0, tot_writes
= 0;
331 show_usage(argc
, argv
);
335 err
= sscanf(argv
[1], "%u", &nr_readers
);
337 show_usage(argc
, argv
);
341 err
= sscanf(argv
[2], "%u", &nr_writers
);
343 show_usage(argc
, argv
);
347 err
= sscanf(argv
[3], "%lu", &duration
);
349 show_usage(argc
, argv
);
353 for (i
= 4; i
< argc
; i
++) {
354 if (argv
[i
][0] != '-')
356 switch (argv
[i
][1]) {
359 yield_active
|= YIELD_READ
;
362 yield_active
|= YIELD_WRITE
;
367 show_usage(argc
, argv
);
371 cpu_affinities
[next_aff
++] = a
;
373 printf_verbose("Adding CPU %d affinity\n", a
);
377 show_usage(argc
, argv
);
380 reclaim_batch
= atol(argv
[++i
]);
384 show_usage(argc
, argv
);
387 rduration
= atol(argv
[++i
]);
391 show_usage(argc
, argv
);
394 wdelay
= atol(argv
[++i
]);
398 show_usage(argc
, argv
);
401 wduration
= atol(argv
[++i
]);
409 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
410 duration
, nr_readers
, nr_writers
);
411 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
412 printf_verbose("Reader duration : %lu loops.\n", rduration
);
413 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
414 "main", pthread_self(), (unsigned long)gettid());
416 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
417 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
418 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
419 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
420 pending_reclaims
= malloc(sizeof(*pending_reclaims
) * nr_writers
);
421 if (reclaim_batch
* sizeof(*pending_reclaims
[i
].queue
)
422 < CAA_CACHE_LINE_SIZE
)
423 for (i
= 0; i
< nr_writers
; i
++)
424 pending_reclaims
[i
].queue
= calloc(1, CAA_CACHE_LINE_SIZE
);
426 for (i
= 0; i
< nr_writers
; i
++)
427 pending_reclaims
[i
].queue
= calloc(reclaim_batch
,
428 sizeof(*pending_reclaims
[i
].queue
));
429 for (i
= 0; i
< nr_writers
; i
++)
430 pending_reclaims
[i
].head
= pending_reclaims
[i
].queue
;
434 for (i
= 0; i
< nr_readers
; i
++) {
435 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
440 for (i
= 0; i
< nr_writers
; i
++) {
441 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
455 for (i
= 0; i
< nr_readers
; i
++) {
456 err
= pthread_join(tid_reader
[i
], &tret
);
459 tot_reads
+= count_reader
[i
];
461 for (i
= 0; i
< nr_writers
; i
++) {
462 err
= pthread_join(tid_writer
[i
], &tret
);
465 tot_writes
+= tot_nr_writes
[i
];
466 rcu_gc_clear_queue(i
);
469 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
471 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
473 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
475 argv
[0], duration
, nr_readers
, rduration
, wduration
,
476 nr_writers
, wdelay
, tot_reads
, tot_writes
,
477 tot_reads
+ tot_writes
, reclaim_batch
);
482 for (i
= 0; i
< nr_writers
; i
++)
483 free(pending_reclaims
[i
].queue
);
484 free(pending_reclaims
);