4 * Userspace RCU library - test program (with baatch reclamation)
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
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)
58 #ifndef DYNAMIC_LINK_TEST
61 #define debug_yield_read()
69 static volatile int test_go
, test_stop
;
71 static unsigned long wdelay
;
73 static struct test_array
*test_rcu_pointer
;
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
;
84 static unsigned long duration
;
86 /* read-side C.S. duration, in loops */
87 static unsigned long rduration
;
89 static inline void loop_sleep(unsigned long l
)
95 static int verbose_mode
;
97 #define printf_verbose(fmt, args...) \
103 static unsigned int cpu_affinities
[NR_CPUS
];
104 static unsigned int next_aff
= 0;
105 static int use_affinity
= 0;
107 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
109 #ifndef HAVE_CPU_SET_T
110 typedef unsigned long cpu_set_t
;
111 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
112 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
115 static void set_affinity(void)
124 #if HAVE_SCHED_SETAFFINITY
125 ret
= pthread_mutex_lock(&affinity_mutex
);
127 perror("Error in pthread mutex lock");
130 cpu
= cpu_affinities
[next_aff
++];
131 ret
= pthread_mutex_unlock(&affinity_mutex
);
133 perror("Error in pthread mutex unlock");
139 #if SCHED_SETAFFINITY_ARGS == 2
140 sched_setaffinity(0, &mask
);
142 sched_setaffinity(0, sizeof(mask
), &mask
);
144 #endif /* HAVE_SCHED_SETAFFINITY */
148 * returns 0 if test should end.
150 static int test_duration_write(void)
155 static int test_duration_read(void)
160 static unsigned long long __thread nr_writes
;
161 static unsigned long long __thread nr_reads
;
164 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_writes
;
166 static unsigned int nr_readers
;
167 static unsigned int nr_writers
;
169 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
171 void rcu_copy_mutex_lock(void)
174 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
176 perror("Error in pthread mutex lock");
181 void rcu_copy_mutex_unlock(void)
185 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
187 perror("Error in pthread mutex unlock");
192 void *thr_reader(void *_count
)
194 unsigned long long *count
= _count
;
195 struct test_array
*local_ptr
;
197 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
198 "reader", pthread_self(), (unsigned long)gettid());
202 rcu_register_thread();
211 local_ptr
= rcu_dereference(test_rcu_pointer
);
214 assert(local_ptr
->a
== 8);
215 if (unlikely(rduration
))
216 loop_sleep(rduration
);
219 if (unlikely(!test_duration_read()))
223 rcu_unregister_thread();
226 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
227 "reader", pthread_self(), (unsigned long)gettid());
232 static void rcu_gc_clear_queue(unsigned long wtidx
)
236 /* Wait for Q.S and empty queue */
239 for (p
= pending_reclaims
[wtidx
].queue
;
240 p
< pending_reclaims
[wtidx
].head
; p
++) {
243 ((struct test_array
*)*p
)->a
= 0;
246 pending_reclaims
[wtidx
].head
= pending_reclaims
[wtidx
].queue
;
249 /* Using per-thread queue */
250 static void rcu_gc_reclaim(unsigned long wtidx
, void *old
)
253 *pending_reclaims
[wtidx
].head
= old
;
254 pending_reclaims
[wtidx
].head
++;
256 if (likely(pending_reclaims
[wtidx
].head
- pending_reclaims
[wtidx
].queue
260 rcu_gc_clear_queue(wtidx
);
263 void *thr_writer(void *data
)
265 unsigned long wtidx
= (unsigned long)data
;
267 struct test_array
*old
= NULL
;
269 struct test_array
*new, *old
;
272 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
273 "writer", pthread_self(), (unsigned long)gettid());
283 #ifndef TEST_LOCAL_GC
284 new = malloc(sizeof(*new));
286 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
288 rcu_gc_reclaim(wtidx
, old
);
290 if (unlikely(!test_duration_write()))
292 if (unlikely(wdelay
))
296 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
297 "writer", pthread_self(), (unsigned long)gettid());
298 tot_nr_writes
[wtidx
] = nr_writes
;
302 void show_usage(int argc
, char **argv
)
304 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
306 printf(" [-r] [-w] (yield reader and/or writer)");
308 printf(" [-d delay] (writer period (us))");
309 printf(" [-c duration] (reader C.S. duration (in loops))");
310 printf(" [-v] (verbose output)");
311 printf(" [-a cpu#] [-a cpu#]... (affinity)");
315 int main(int argc
, char **argv
)
318 pthread_t
*tid_reader
, *tid_writer
;
320 unsigned long long *count_reader
;
321 unsigned long long tot_reads
= 0, tot_writes
= 0;
325 show_usage(argc
, argv
);
329 err
= sscanf(argv
[1], "%u", &nr_readers
);
331 show_usage(argc
, argv
);
335 err
= sscanf(argv
[2], "%u", &nr_writers
);
337 show_usage(argc
, argv
);
341 err
= sscanf(argv
[3], "%lu", &duration
);
343 show_usage(argc
, argv
);
347 for (i
= 4; i
< argc
; i
++) {
348 if (argv
[i
][0] != '-')
350 switch (argv
[i
][1]) {
353 yield_active
|= YIELD_READ
;
356 yield_active
|= YIELD_WRITE
;
361 show_usage(argc
, argv
);
365 cpu_affinities
[next_aff
++] = a
;
367 printf_verbose("Adding CPU %d affinity\n", a
);
371 show_usage(argc
, argv
);
374 reclaim_batch
= atol(argv
[++i
]);
378 show_usage(argc
, argv
);
381 rduration
= atol(argv
[++i
]);
385 show_usage(argc
, argv
);
388 wdelay
= atol(argv
[++i
]);
396 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
397 duration
, nr_readers
, nr_writers
);
398 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
399 printf_verbose("Reader duration : %lu loops.\n", rduration
);
400 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
401 "main", pthread_self(), (unsigned long)gettid());
403 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
404 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
405 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
406 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
407 pending_reclaims
= malloc(sizeof(*pending_reclaims
) * nr_writers
);
408 if (reclaim_batch
* sizeof(*pending_reclaims
[i
].queue
)
410 for (i
= 0; i
< nr_writers
; i
++)
411 pending_reclaims
[i
].queue
= calloc(1, CACHE_LINE_SIZE
);
413 for (i
= 0; i
< nr_writers
; i
++)
414 pending_reclaims
[i
].queue
= calloc(reclaim_batch
,
415 sizeof(*pending_reclaims
[i
].queue
));
416 for (i
= 0; i
< nr_writers
; i
++)
417 pending_reclaims
[i
].head
= pending_reclaims
[i
].queue
;
421 for (i
= 0; i
< nr_readers
; i
++) {
422 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
427 for (i
= 0; i
< nr_writers
; i
++) {
428 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
442 for (i
= 0; i
< nr_readers
; i
++) {
443 err
= pthread_join(tid_reader
[i
], &tret
);
446 tot_reads
+= count_reader
[i
];
448 for (i
= 0; i
< nr_writers
; i
++) {
449 err
= pthread_join(tid_writer
[i
], &tret
);
452 tot_writes
+= tot_nr_writes
[i
];
453 rcu_gc_clear_queue(i
);
456 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
458 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
460 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
462 argv
[0], duration
, nr_readers
, rduration
,
463 nr_writers
, wdelay
, tot_reads
, tot_writes
,
464 tot_reads
+ tot_writes
, reclaim_batch
);
469 for (i
= 0; i
< nr_writers
; i
++)
470 free(pending_reclaims
[i
].queue
);
471 free(pending_reclaims
);