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>
36 #include <urcu/arch.h>
38 /* hardcoded number of CPUs */
41 #if defined(_syscall0)
42 _syscall0(pid_t
, gettid
)
43 #elif defined(__NR_gettid)
44 static inline pid_t
gettid(void)
46 return syscall(__NR_gettid
);
49 #warning "use pid as tid"
50 static inline pid_t
gettid(void)
56 #ifndef DYNAMIC_LINK_TEST
59 #define debug_yield_read()
67 static pthread_mutex_t lock
;
69 static volatile int test_go
, test_stop
;
71 static unsigned long wdelay
;
73 static volatile struct test_array test_array
= { 8 };
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 static void set_affinity(void)
109 ret
= pthread_mutex_lock(&affinity_mutex
);
111 perror("Error in pthread mutex lock");
114 cpu
= cpu_affinities
[next_aff
++];
115 ret
= pthread_mutex_unlock(&affinity_mutex
);
117 perror("Error in pthread mutex unlock");
122 sched_setaffinity(0, sizeof(mask
), &mask
);
126 * returns 0 if test should end.
128 static int test_duration_write(void)
133 static int test_duration_read(void)
138 static unsigned long long __thread nr_writes
;
139 static unsigned long long __thread nr_reads
;
142 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_writes
;
144 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_reads
;
146 static unsigned int nr_readers
;
147 static unsigned int nr_writers
;
149 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
151 void rcu_copy_mutex_lock(void)
154 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
156 perror("Error in pthread mutex lock");
161 void rcu_copy_mutex_unlock(void)
165 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
167 perror("Error in pthread mutex unlock");
172 void *thr_reader(void *data
)
174 unsigned long tidx
= (unsigned long)data
;
176 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
177 "reader", pthread_self(), (unsigned long)gettid());
186 pthread_mutex_lock(&lock
);
187 assert(test_array
.a
== 8);
188 if (unlikely(rduration
))
189 loop_sleep(rduration
);
190 pthread_mutex_unlock(&lock
);
192 if (unlikely(!test_duration_read()))
196 tot_nr_reads
[tidx
] = nr_reads
;
197 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
198 "reader", pthread_self(), (unsigned long)gettid());
203 void *thr_writer(void *data
)
205 unsigned long wtidx
= (unsigned long)data
;
207 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
208 "writer", pthread_self(), (unsigned long)gettid());
218 pthread_mutex_lock(&lock
);
221 pthread_mutex_unlock(&lock
);
223 if (unlikely(!test_duration_write()))
225 if (unlikely(wdelay
))
229 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
230 "writer", pthread_self(), (unsigned long)gettid());
231 tot_nr_writes
[wtidx
] = nr_writes
;
235 void show_usage(int argc
, char **argv
)
237 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
239 printf(" [-r] [-w] (yield reader and/or writer)");
241 printf(" [-d delay] (writer period (us))");
242 printf(" [-c duration] (reader C.S. duration (in loops))");
243 printf(" [-v] (verbose output)");
244 printf(" [-a cpu#] [-a cpu#]... (affinity)");
248 int main(int argc
, char **argv
)
251 pthread_t
*tid_reader
, *tid_writer
;
253 unsigned long long *count_reader
, *count_writer
;
254 unsigned long long tot_reads
= 0, tot_writes
= 0;
258 show_usage(argc
, argv
);
263 err
= sscanf(argv
[1], "%u", &nr_readers
);
265 show_usage(argc
, argv
);
269 err
= sscanf(argv
[2], "%u", &nr_writers
);
271 show_usage(argc
, argv
);
275 err
= sscanf(argv
[3], "%lu", &duration
);
277 show_usage(argc
, argv
);
281 for (i
= 4; i
< argc
; i
++) {
282 if (argv
[i
][0] != '-')
284 switch (argv
[i
][1]) {
287 yield_active
|= YIELD_READ
;
290 yield_active
|= YIELD_WRITE
;
295 show_usage(argc
, argv
);
299 cpu_affinities
[next_aff
++] = a
;
301 printf_verbose("Adding CPU %d affinity\n", a
);
305 show_usage(argc
, argv
);
308 rduration
= atol(argv
[++i
]);
312 show_usage(argc
, argv
);
315 wdelay
= atol(argv
[++i
]);
323 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
324 duration
, nr_readers
, nr_writers
);
325 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
326 printf_verbose("Reader duration : %lu loops.\n", rduration
);
327 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
328 "main", pthread_self(), (unsigned long)gettid());
330 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
331 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
332 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
333 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
334 tot_nr_reads
= malloc(sizeof(*tot_nr_reads
) * nr_readers
);
335 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
339 for (i
= 0; i
< nr_readers
; i
++) {
340 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
345 for (i
= 0; i
< nr_writers
; i
++) {
346 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
360 for (i
= 0; i
< nr_readers
; i
++) {
361 err
= pthread_join(tid_reader
[i
], &tret
);
364 tot_reads
+= tot_nr_reads
[i
];
366 for (i
= 0; i
< nr_writers
; i
++) {
367 err
= pthread_join(tid_writer
[i
], &tret
);
370 tot_writes
+= tot_nr_writes
[i
];
373 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
375 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
377 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
378 argv
[0], duration
, nr_readers
, rduration
,
379 nr_writers
, wdelay
, tot_reads
, tot_writes
,
380 tot_reads
+ tot_writes
);