4 * Userspace RCU library - test program
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 long duration
;
77 /* read-side C.S. duration, in loops */
78 static unsigned long rduration
;
80 static inline void loop_sleep(unsigned long l
)
86 static int verbose_mode
;
88 #define printf_verbose(fmt, args...) \
94 static unsigned int cpu_affinities
[NR_CPUS
];
95 static unsigned int next_aff
= 0;
96 static int use_affinity
= 0;
98 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
100 #ifndef HAVE_CPU_SET_T
101 typedef unsigned long cpu_set_t
;
102 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
103 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
106 static void set_affinity(void)
115 #if HAVE_SCHED_SETAFFINITY
116 ret
= pthread_mutex_lock(&affinity_mutex
);
118 perror("Error in pthread mutex lock");
121 cpu
= cpu_affinities
[next_aff
++];
122 ret
= pthread_mutex_unlock(&affinity_mutex
);
124 perror("Error in pthread mutex unlock");
130 #if SCHED_SETAFFINITY_ARGS == 2
131 sched_setaffinity(0, &mask
);
133 sched_setaffinity(0, sizeof(mask
), &mask
);
135 #endif /* HAVE_SCHED_SETAFFINITY */
139 * returns 0 if test should end.
141 static int test_duration_write(void)
146 static int test_duration_read(void)
151 static unsigned long long __thread nr_writes
;
152 static unsigned long long __thread nr_reads
;
154 static unsigned int nr_readers
;
155 static unsigned int nr_writers
;
157 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
159 void rcu_copy_mutex_lock(void)
162 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
164 perror("Error in pthread mutex lock");
169 void rcu_copy_mutex_unlock(void)
173 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
175 perror("Error in pthread mutex unlock");
181 * malloc/free are reusing memory areas too quickly, which does not let us
182 * test races appropriately. Use a large circular array for allocations.
183 * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail.
185 #define ARRAY_SIZE (1048576 * nr_writers)
186 #define ARRAY_POISON 0xDEADBEEF
187 static int array_index
;
188 static struct test_array
*test_array
;
190 static struct test_array
*test_array_alloc(void)
192 struct test_array
*ret
;
195 rcu_copy_mutex_lock();
196 index
= array_index
% ARRAY_SIZE
;
197 assert(test_array
[index
].a
== ARRAY_POISON
||
198 test_array
[index
].a
== 0);
199 ret
= &test_array
[index
];
201 if (array_index
== ARRAY_SIZE
)
203 rcu_copy_mutex_unlock();
207 static void test_array_free(struct test_array
*ptr
)
211 rcu_copy_mutex_lock();
212 ptr
->a
= ARRAY_POISON
;
213 rcu_copy_mutex_unlock();
216 void *thr_reader(void *_count
)
218 unsigned long long *count
= _count
;
219 struct test_array
*local_ptr
;
221 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
222 "reader", pthread_self(), (unsigned long)gettid());
226 rcu_register_thread();
235 local_ptr
= rcu_dereference(test_rcu_pointer
);
238 assert(local_ptr
->a
== 8);
239 if (unlikely(rduration
))
240 loop_sleep(rduration
);
243 if (unlikely(!test_duration_read()))
247 rcu_unregister_thread();
250 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
251 "reader", pthread_self(), (unsigned long)gettid());
256 void *thr_writer(void *_count
)
258 unsigned long long *count
= _count
;
259 struct test_array
*new, *old
;
261 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
262 "writer", pthread_self(), (unsigned long)gettid());
272 new = test_array_alloc();
274 rcu_copy_mutex_lock();
275 old
= test_rcu_pointer
;
276 rcu_assign_pointer(test_rcu_pointer
, new);
277 rcu_copy_mutex_unlock();
281 test_array_free(old
);
283 if (unlikely(!test_duration_write()))
285 if (unlikely(wdelay
))
289 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
290 "writer", pthread_self(), (unsigned long)gettid());
295 void show_usage(int argc
, char **argv
)
297 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
299 printf(" [-r] [-w] (yield reader and/or writer)");
301 printf(" [-d delay] (writer period (us))");
302 printf(" [-c duration] (reader C.S. duration (in loops))");
303 printf(" [-v] (verbose output)");
304 printf(" [-a cpu#] [-a cpu#]... (affinity)");
308 int main(int argc
, char **argv
)
311 pthread_t
*tid_reader
, *tid_writer
;
313 unsigned long long *count_reader
, *count_writer
;
314 unsigned long long tot_reads
= 0, tot_writes
= 0;
318 show_usage(argc
, argv
);
322 err
= sscanf(argv
[1], "%u", &nr_readers
);
324 show_usage(argc
, argv
);
328 err
= sscanf(argv
[2], "%u", &nr_writers
);
330 show_usage(argc
, argv
);
334 err
= sscanf(argv
[3], "%lu", &duration
);
336 show_usage(argc
, argv
);
340 for (i
= 4; i
< argc
; i
++) {
341 if (argv
[i
][0] != '-')
343 switch (argv
[i
][1]) {
346 yield_active
|= YIELD_READ
;
349 yield_active
|= YIELD_WRITE
;
354 show_usage(argc
, argv
);
358 cpu_affinities
[next_aff
++] = a
;
360 printf_verbose("Adding CPU %d affinity\n", a
);
364 show_usage(argc
, argv
);
367 rduration
= atol(argv
[++i
]);
371 show_usage(argc
, argv
);
374 wdelay
= atol(argv
[++i
]);
382 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
383 duration
, nr_readers
, nr_writers
);
384 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
385 printf_verbose("Reader duration : %lu loops.\n", rduration
);
386 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
387 "main", pthread_self(), (unsigned long)gettid());
389 test_array
= malloc(sizeof(*test_array
) * ARRAY_SIZE
);
390 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
391 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
392 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
393 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
397 for (i
= 0; i
< nr_readers
; i
++) {
398 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
403 for (i
= 0; i
< nr_writers
; i
++) {
404 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
418 for (i
= 0; i
< nr_readers
; i
++) {
419 err
= pthread_join(tid_reader
[i
], &tret
);
422 tot_reads
+= count_reader
[i
];
424 for (i
= 0; i
< nr_writers
; i
++) {
425 err
= pthread_join(tid_writer
[i
], &tret
);
428 tot_writes
+= count_writer
[i
];
431 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
433 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
435 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
436 argv
[0], duration
, nr_readers
, rduration
,
437 nr_writers
, wdelay
, tot_reads
, tot_writes
,
438 tot_reads
+ tot_writes
);
439 test_array_free(test_rcu_pointer
);