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 #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...) \
99 * returns 0 if test should end.
101 static int test_duration_write(void)
106 static int test_duration_read(void)
111 static unsigned long long __thread nr_writes
;
112 static unsigned long long __thread nr_reads
;
115 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_writes
;
117 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_reads
;
119 static unsigned int nr_readers
;
120 static unsigned int nr_writers
;
122 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
124 void rcu_copy_mutex_lock(void)
127 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
129 perror("Error in pthread mutex lock");
134 void rcu_copy_mutex_unlock(void)
138 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
140 perror("Error in pthread mutex unlock");
145 void *thr_reader(void *data
)
147 unsigned long tidx
= (unsigned long)data
;
149 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
150 "reader", pthread_self(), (unsigned long)gettid());
157 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
158 assert(test_array
.a
== 8);
159 if (unlikely(rduration
))
160 loop_sleep(rduration
);
161 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
163 if (unlikely(!test_duration_read()))
167 tot_nr_reads
[tidx
] = nr_reads
;
168 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
169 "reader", pthread_self(), (unsigned long)gettid());
174 void *thr_writer(void *data
)
176 unsigned long wtidx
= (unsigned long)data
;
179 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
180 "writer", pthread_self(), (unsigned long)gettid());
188 for (tidx
= 0; tidx
< nr_readers
; tidx
++) {
189 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
193 for (tidx
= (long)nr_readers
- 1; tidx
>= 0; tidx
--) {
194 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
197 if (unlikely(!test_duration_write()))
199 if (unlikely(wdelay
))
203 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
204 "writer", pthread_self(), (unsigned long)gettid());
205 tot_nr_writes
[wtidx
] = nr_writes
;
209 void show_usage(int argc
, char **argv
)
211 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
213 printf(" [-r] [-w] (yield reader and/or writer)");
215 printf(" [-d delay] (writer period (us))");
216 printf(" [-c duration] (reader C.S. duration (in loops))");
217 printf(" [-v] (verbose output)");
218 printf(" [-a cpu#] [-a cpu#]... (affinity)");
224 int main(int argc
, char **argv
)
227 pthread_t
*tid_reader
, *tid_writer
;
229 unsigned long long *count_reader
, *count_writer
;
230 unsigned long long tot_reads
= 0, tot_writes
= 0;
232 int use_affinity
= 0;
235 show_usage(argc
, argv
);
240 err
= sscanf(argv
[1], "%u", &nr_readers
);
242 show_usage(argc
, argv
);
246 err
= sscanf(argv
[2], "%u", &nr_writers
);
248 show_usage(argc
, argv
);
252 err
= sscanf(argv
[3], "%lu", &duration
);
254 show_usage(argc
, argv
);
260 for (i
= 4; i
< argc
; i
++) {
261 if (argv
[i
][0] != '-')
263 switch (argv
[i
][1]) {
266 yield_active
|= YIELD_READ
;
269 yield_active
|= YIELD_WRITE
;
274 show_usage(argc
, argv
);
278 CPU_SET(a
, &affinity
);
280 printf_verbose("Adding CPU %d affinity\n", a
);
284 show_usage(argc
, argv
);
287 rduration
= atol(argv
[++i
]);
291 show_usage(argc
, argv
);
294 wdelay
= atol(argv
[++i
]);
302 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
303 duration
, nr_readers
, nr_writers
);
304 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
305 printf_verbose("Reader duration : %lu loops.\n", rduration
);
306 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
307 "main", pthread_self(), (unsigned long)gettid());
310 && sched_setaffinity(0, sizeof(affinity
), &affinity
) < 0) {
311 perror("sched_setaffinity");
315 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
316 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
317 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
318 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
319 tot_nr_reads
= malloc(sizeof(*tot_nr_reads
) * nr_readers
);
320 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
321 per_thread_lock
= malloc(sizeof(*per_thread_lock
) * nr_readers
);
323 for (i
= 0; i
< nr_readers
; i
++) {
324 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
329 for (i
= 0; i
< nr_writers
; i
++) {
330 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
344 for (i
= 0; i
< nr_readers
; i
++) {
345 err
= pthread_join(tid_reader
[i
], &tret
);
348 tot_reads
+= tot_nr_reads
[i
];
350 for (i
= 0; i
< nr_writers
; i
++) {
351 err
= pthread_join(tid_writer
[i
], &tret
);
354 tot_writes
+= tot_nr_writes
[i
];
357 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
359 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
361 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
362 argv
[0], duration
, nr_readers
, rduration
,
363 nr_writers
, wdelay
, tot_reads
, tot_writes
,
364 tot_reads
+ tot_writes
);
372 free(per_thread_lock
);