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 struct per_thread_lock
{
69 } __attribute__((aligned(CACHE_LINE_SIZE
))); /* cache-line aligned */
71 static struct per_thread_lock
*per_thread_lock
;
73 static volatile int test_go
, test_stop
;
75 static unsigned long wdelay
;
77 static volatile struct test_array test_array
= { 8 };
79 static unsigned long duration
;
81 /* read-side C.S. duration, in loops */
82 static unsigned long rduration
;
84 static inline void loop_sleep(unsigned long l
)
90 static int verbose_mode
;
92 #define printf_verbose(fmt, args...) \
98 static unsigned int cpu_affinities
[NR_CPUS
];
99 static unsigned int next_aff
= 0;
100 static int use_affinity
= 0;
102 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
104 static void set_affinity(void)
113 ret
= pthread_mutex_lock(&affinity_mutex
);
115 perror("Error in pthread mutex lock");
118 cpu
= cpu_affinities
[next_aff
++];
119 ret
= pthread_mutex_unlock(&affinity_mutex
);
121 perror("Error in pthread mutex unlock");
126 sched_setaffinity(0, sizeof(mask
), &mask
);
130 * returns 0 if test should end.
132 static int test_duration_write(void)
137 static int test_duration_read(void)
142 static unsigned long long __thread nr_writes
;
143 static unsigned long long __thread nr_reads
;
146 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_writes
;
148 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_reads
;
150 static unsigned int nr_readers
;
151 static unsigned int nr_writers
;
153 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
155 void rcu_copy_mutex_lock(void)
158 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
160 perror("Error in pthread mutex lock");
165 void rcu_copy_mutex_unlock(void)
169 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
171 perror("Error in pthread mutex unlock");
176 void *thr_reader(void *data
)
178 unsigned long tidx
= (unsigned long)data
;
180 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
181 "reader", pthread_self(), (unsigned long)gettid());
190 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
191 assert(test_array
.a
== 8);
192 if (unlikely(rduration
))
193 loop_sleep(rduration
);
194 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
196 if (unlikely(!test_duration_read()))
200 tot_nr_reads
[tidx
] = nr_reads
;
201 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
202 "reader", pthread_self(), (unsigned long)gettid());
207 void *thr_writer(void *data
)
209 unsigned long wtidx
= (unsigned long)data
;
212 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
213 "writer", pthread_self(), (unsigned long)gettid());
223 for (tidx
= 0; tidx
< nr_readers
; tidx
++) {
224 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
228 for (tidx
= (long)nr_readers
- 1; tidx
>= 0; tidx
--) {
229 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
232 if (unlikely(!test_duration_write()))
234 if (unlikely(wdelay
))
238 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
239 "writer", pthread_self(), (unsigned long)gettid());
240 tot_nr_writes
[wtidx
] = nr_writes
;
244 void show_usage(int argc
, char **argv
)
246 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
248 printf(" [-r] [-w] (yield reader and/or writer)");
250 printf(" [-d delay] (writer period (us))");
251 printf(" [-c duration] (reader C.S. duration (in loops))");
252 printf(" [-v] (verbose output)");
253 printf(" [-a cpu#] [-a cpu#]... (affinity)");
257 int main(int argc
, char **argv
)
260 pthread_t
*tid_reader
, *tid_writer
;
262 unsigned long long *count_reader
, *count_writer
;
263 unsigned long long tot_reads
= 0, tot_writes
= 0;
267 show_usage(argc
, argv
);
272 err
= sscanf(argv
[1], "%u", &nr_readers
);
274 show_usage(argc
, argv
);
278 err
= sscanf(argv
[2], "%u", &nr_writers
);
280 show_usage(argc
, argv
);
284 err
= sscanf(argv
[3], "%lu", &duration
);
286 show_usage(argc
, argv
);
290 for (i
= 4; i
< argc
; i
++) {
291 if (argv
[i
][0] != '-')
293 switch (argv
[i
][1]) {
296 yield_active
|= YIELD_READ
;
299 yield_active
|= YIELD_WRITE
;
304 show_usage(argc
, argv
);
308 cpu_affinities
[next_aff
++] = a
;
310 printf_verbose("Adding CPU %d affinity\n", a
);
314 show_usage(argc
, argv
);
317 rduration
= atol(argv
[++i
]);
321 show_usage(argc
, argv
);
324 wdelay
= atol(argv
[++i
]);
332 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
333 duration
, nr_readers
, nr_writers
);
334 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
335 printf_verbose("Reader duration : %lu loops.\n", rduration
);
336 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
337 "main", pthread_self(), (unsigned long)gettid());
339 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
340 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
341 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
342 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
343 tot_nr_reads
= malloc(sizeof(*tot_nr_reads
) * nr_readers
);
344 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
345 per_thread_lock
= malloc(sizeof(*per_thread_lock
) * nr_readers
);
349 for (i
= 0; i
< nr_readers
; i
++) {
350 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
355 for (i
= 0; i
< nr_writers
; i
++) {
356 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
370 for (i
= 0; i
< nr_readers
; i
++) {
371 err
= pthread_join(tid_reader
[i
], &tret
);
374 tot_reads
+= tot_nr_reads
[i
];
376 for (i
= 0; i
< nr_writers
; i
++) {
377 err
= pthread_join(tid_writer
[i
], &tret
);
380 tot_writes
+= tot_nr_writes
[i
];
383 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
385 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
387 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
388 argv
[0], duration
, nr_readers
, rduration
,
389 nr_writers
, wdelay
, tot_reads
, tot_writes
,
390 tot_reads
+ tot_writes
);
398 free(per_thread_lock
);