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.
28 #include <sys/types.h>
33 #include <sys/syscall.h>
38 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
39 #define CACHE_LINE_SIZE 4096
41 /* hardcoded number of CPUs */
44 #if defined(_syscall0)
45 _syscall0(pid_t
, gettid
)
46 #elif defined(__NR_gettid)
47 static inline pid_t
gettid(void)
49 return syscall(__NR_gettid
);
52 #warning "use pid as tid"
53 static inline pid_t
gettid(void)
60 #include "urcu-qsbr.h"
66 static volatile int test_go
, test_stop
;
68 static unsigned long wdelay
;
70 static struct test_array
*test_rcu_pointer
;
72 static unsigned long duration
;
74 /* read-side C.S. duration, in loops */
75 static unsigned long rduration
;
77 static inline void loop_sleep(unsigned long l
)
83 static int verbose_mode
;
85 #define printf_verbose(fmt, args...) \
91 static unsigned int cpu_affinities
[NR_CPUS
];
92 static unsigned int next_aff
= 0;
93 static int use_affinity
= 0;
95 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
97 static void set_affinity(void)
106 ret
= pthread_mutex_lock(&affinity_mutex
);
108 perror("Error in pthread mutex lock");
111 cpu
= cpu_affinities
[next_aff
++];
112 ret
= pthread_mutex_unlock(&affinity_mutex
);
114 perror("Error in pthread mutex unlock");
119 sched_setaffinity(0, sizeof(mask
), &mask
);
123 * returns 0 if test should end.
125 static int test_duration_write(void)
130 static int test_duration_read(void)
135 static unsigned long long __thread nr_writes
;
136 static unsigned long long __thread nr_reads
;
138 static unsigned int nr_readers
;
139 static unsigned int nr_writers
;
141 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
143 void rcu_copy_mutex_lock(void)
146 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
148 perror("Error in pthread mutex lock");
153 void rcu_copy_mutex_unlock(void)
157 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
159 perror("Error in pthread mutex unlock");
165 * malloc/free are reusing memory areas too quickly, which does not let us
166 * test races appropriately. Use a large circular array for allocations.
167 * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail.
169 #define ARRAY_SIZE (1048576 * nr_writers)
170 #define ARRAY_POISON 0xDEADBEEF
171 static int array_index
;
172 static struct test_array
*test_array
;
174 static struct test_array
*test_array_alloc(void)
176 struct test_array
*ret
;
179 rcu_copy_mutex_lock();
180 index
= array_index
% ARRAY_SIZE
;
181 assert(test_array
[index
].a
== ARRAY_POISON
||
182 test_array
[index
].a
== 0);
183 ret
= &test_array
[index
];
185 if (array_index
== ARRAY_SIZE
)
187 rcu_copy_mutex_unlock();
191 static void test_array_free(struct test_array
*ptr
)
195 rcu_copy_mutex_lock();
196 ptr
->a
= ARRAY_POISON
;
197 rcu_copy_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 (unlikely(rduration
))
224 loop_sleep(rduration
);
227 /* QS each 1024 reads */
228 if (unlikely((nr_reads
& ((1 << 10) - 1)) == 0))
229 _rcu_quiescent_state();
230 if (unlikely(!test_duration_read()))
234 rcu_unregister_thread();
237 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
238 "reader", pthread_self(), (unsigned long)gettid());
243 void *thr_writer(void *_count
)
245 unsigned long long *count
= _count
;
246 struct test_array
*new, *old
;
248 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
249 "writer", pthread_self(), (unsigned long)gettid());
259 new = test_array_alloc();
260 rcu_copy_mutex_lock();
261 old
= test_rcu_pointer
;
265 old
= _rcu_publish_content(&test_rcu_pointer
, new);
266 rcu_copy_mutex_unlock();
267 /* can be done after unlock */
270 test_array_free(old
);
272 if (unlikely(!test_duration_write()))
274 if (unlikely(wdelay
))
278 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
279 "writer", pthread_self(), (unsigned long)gettid());
284 void show_usage(int argc
, char **argv
)
286 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
288 printf(" [-r] [-w] (yield reader and/or writer)");
290 printf(" [-d delay] (writer period (us))");
291 printf(" [-c duration] (reader C.S. duration (in loops))");
292 printf(" [-v] (verbose output)");
293 printf(" [-a cpu#] [-a cpu#]... (affinity)");
297 int main(int argc
, char **argv
)
300 pthread_t
*tid_reader
, *tid_writer
;
302 unsigned long long *count_reader
, *count_writer
;
303 unsigned long long tot_reads
= 0, tot_writes
= 0;
307 show_usage(argc
, argv
);
311 err
= sscanf(argv
[1], "%u", &nr_readers
);
313 show_usage(argc
, argv
);
317 err
= sscanf(argv
[2], "%u", &nr_writers
);
319 show_usage(argc
, argv
);
323 err
= sscanf(argv
[3], "%lu", &duration
);
325 show_usage(argc
, argv
);
329 for (i
= 4; i
< argc
; i
++) {
330 if (argv
[i
][0] != '-')
332 switch (argv
[i
][1]) {
335 yield_active
|= YIELD_READ
;
338 yield_active
|= YIELD_WRITE
;
343 show_usage(argc
, argv
);
347 cpu_affinities
[next_aff
++] = a
;
349 printf_verbose("Adding CPU %d affinity\n", a
);
353 show_usage(argc
, argv
);
356 rduration
= atol(argv
[++i
]);
360 show_usage(argc
, argv
);
363 wdelay
= atol(argv
[++i
]);
371 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
372 duration
, nr_readers
, nr_writers
);
373 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
374 printf_verbose("Reader duration : %lu loops.\n", rduration
);
375 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
376 "main", pthread_self(), (unsigned long)gettid());
378 test_array
= malloc(sizeof(*test_array
) * ARRAY_SIZE
);
379 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
380 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
381 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
382 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
386 for (i
= 0; i
< nr_readers
; i
++) {
387 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
392 for (i
= 0; i
< nr_writers
; i
++) {
393 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
407 for (i
= 0; i
< nr_readers
; i
++) {
408 err
= pthread_join(tid_reader
[i
], &tret
);
411 tot_reads
+= count_reader
[i
];
413 for (i
= 0; i
< nr_writers
; i
++) {
414 err
= pthread_join(tid_writer
[i
], &tret
);
417 tot_writes
+= count_writer
[i
];
420 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
422 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
424 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
425 argv
[0], duration
, nr_readers
, rduration
,
426 nr_writers
, wdelay
, tot_reads
, tot_writes
,
427 tot_reads
+ tot_writes
);
428 test_array_free(test_rcu_pointer
);