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)
59 #ifndef DYNAMIC_LINK_TEST
62 #define debug_yield_read()
70 pthread_rwlock_t lock
= PTHREAD_RWLOCK_INITIALIZER
;
72 static volatile int test_go
, test_stop
;
74 static unsigned long wdelay
;
76 static volatile struct test_array test_array
= { 8 };
78 static unsigned long duration
;
80 /* read-side C.S. duration, in loops */
81 static unsigned long rduration
;
83 static inline void loop_sleep(unsigned long l
)
89 static int verbose_mode
;
91 #define printf_verbose(fmt, args...) \
97 static unsigned int cpu_affinities
[NR_CPUS
];
98 static unsigned int next_aff
= 0;
99 static int use_affinity
= 0;
101 static void set_affinity(void)
109 cpu
= cpu_affinities
[next_aff
++];
112 sched_setaffinity(0, sizeof(mask
), &mask
);
118 * returns 0 if test should end.
120 static int test_duration_write(void)
125 static int test_duration_read(void)
130 static unsigned long long __thread nr_writes
;
131 static unsigned long long __thread nr_reads
;
133 static unsigned int nr_readers
;
134 static unsigned int nr_writers
;
136 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
138 void rcu_copy_mutex_lock(void)
141 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
143 perror("Error in pthread mutex lock");
148 void rcu_copy_mutex_unlock(void)
152 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
154 perror("Error in pthread mutex unlock");
159 void *thr_reader(void *_count
)
161 unsigned long long *count
= _count
;
163 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
164 "reader", pthread_self(), (unsigned long)gettid());
173 pthread_rwlock_rdlock(&lock
);
174 assert(test_array
.a
== 8);
175 if (unlikely(rduration
))
176 loop_sleep(rduration
);
177 pthread_rwlock_unlock(&lock
);
179 if (unlikely(!test_duration_read()))
184 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
185 "reader", pthread_self(), (unsigned long)gettid());
190 void *thr_writer(void *_count
)
192 unsigned long long *count
= _count
;
194 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
195 "writer", pthread_self(), (unsigned long)gettid());
205 pthread_rwlock_wrlock(&lock
);
208 pthread_rwlock_unlock(&lock
);
210 if (unlikely(!test_duration_write()))
212 if (unlikely(wdelay
))
216 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
217 "writer", pthread_self(), (unsigned long)gettid());
222 void show_usage(int argc
, char **argv
)
224 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
226 printf(" [-r] [-w] (yield reader and/or writer)");
228 printf(" [-d delay] (writer period (us))");
229 printf(" [-c duration] (reader C.S. duration (in loops))");
230 printf(" [-v] (verbose output)");
231 printf(" [-a cpu#] [-a cpu#]... (affinity)");
235 int main(int argc
, char **argv
)
238 pthread_t
*tid_reader
, *tid_writer
;
240 unsigned long long *count_reader
, *count_writer
;
241 unsigned long long tot_reads
= 0, tot_writes
= 0;
245 show_usage(argc
, argv
);
250 err
= sscanf(argv
[1], "%u", &nr_readers
);
252 show_usage(argc
, argv
);
256 err
= sscanf(argv
[2], "%u", &nr_writers
);
258 show_usage(argc
, argv
);
262 err
= sscanf(argv
[3], "%lu", &duration
);
264 show_usage(argc
, argv
);
268 for (i
= 4; i
< argc
; i
++) {
269 if (argv
[i
][0] != '-')
271 switch (argv
[i
][1]) {
274 yield_active
|= YIELD_READ
;
277 yield_active
|= YIELD_WRITE
;
282 show_usage(argc
, argv
);
286 cpu_affinities
[next_aff
++] = a
;
288 printf_verbose("Adding CPU %d affinity\n", a
);
292 show_usage(argc
, argv
);
295 rduration
= atol(argv
[++i
]);
299 show_usage(argc
, argv
);
302 wdelay
= atol(argv
[++i
]);
310 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
311 duration
, nr_readers
, nr_writers
);
312 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
313 printf_verbose("Reader duration : %lu loops.\n", rduration
);
314 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
315 "main", pthread_self(), (unsigned long)gettid());
317 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
318 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
319 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
320 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
324 for (i
= 0; i
< nr_readers
; i
++) {
325 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
330 for (i
= 0; i
< nr_writers
; i
++) {
331 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
345 for (i
= 0; i
< nr_readers
; i
++) {
346 err
= pthread_join(tid_reader
[i
], &tret
);
349 tot_reads
+= count_reader
[i
];
351 for (i
= 0; i
< nr_writers
; i
++) {
352 err
= pthread_join(tid_writer
[i
], &tret
);
355 tot_writes
+= count_writer
[i
];
358 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
360 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
362 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
363 argv
[0], duration
, nr_readers
, rduration
,
364 nr_writers
, wdelay
, tot_reads
, tot_writes
,
365 tot_reads
+ tot_writes
);