4 * Userspace RCU library - test program
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
24 #include "../config.h"
29 #include <sys/types.h>
36 #include <urcu/arch.h>
37 #include <urcu/tls-compat.h>
44 /* hardcoded number of CPUs */
47 #if defined(_syscall0)
48 _syscall0(pid_t
, gettid
)
49 #elif defined(__NR_gettid)
50 static inline pid_t
gettid(void)
52 return syscall(__NR_gettid
);
55 #warning "use pid as tid"
56 static inline pid_t
gettid(void)
62 #ifndef DYNAMIC_LINK_TEST
65 #define debug_yield_read()
73 struct per_thread_lock
{
75 } __attribute__((aligned(CAA_CACHE_LINE_SIZE
))); /* cache-line aligned */
77 static struct per_thread_lock
*per_thread_lock
;
79 static volatile int test_go
, test_stop
;
81 static unsigned long wdelay
;
83 static volatile struct test_array test_array
= { 8 };
85 static unsigned long duration
;
87 /* read-side C.S. duration, in loops */
88 static unsigned long rduration
;
90 /* write-side C.S. duration, in loops */
91 static unsigned long wduration
;
93 static inline void loop_sleep(unsigned long l
)
99 static int verbose_mode
;
101 #define printf_verbose(fmt, args...) \
107 static unsigned int cpu_affinities
[NR_CPUS
];
108 static unsigned int next_aff
= 0;
109 static int use_affinity
= 0;
111 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
113 static void set_affinity(void)
122 #if HAVE_SCHED_SETAFFINITY
123 ret
= pthread_mutex_lock(&affinity_mutex
);
125 perror("Error in pthread mutex lock");
128 cpu
= cpu_affinities
[next_aff
++];
129 ret
= pthread_mutex_unlock(&affinity_mutex
);
131 perror("Error in pthread mutex unlock");
136 #if SCHED_SETAFFINITY_ARGS == 2
137 sched_setaffinity(0, &mask
);
139 sched_setaffinity(0, sizeof(mask
), &mask
);
141 #endif /* HAVE_SCHED_SETAFFINITY */
145 * returns 0 if test should end.
147 static int test_duration_write(void)
152 static int test_duration_read(void)
157 static DEFINE_URCU_TLS(unsigned long long, nr_writes
);
158 static DEFINE_URCU_TLS(unsigned long long, nr_reads
);
161 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *tot_nr_writes
;
163 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *tot_nr_reads
;
165 static unsigned int nr_readers
;
166 static unsigned int nr_writers
;
168 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
170 void rcu_copy_mutex_lock(void)
173 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
175 perror("Error in pthread mutex lock");
180 void rcu_copy_mutex_unlock(void)
184 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
186 perror("Error in pthread mutex unlock");
191 void *thr_reader(void *data
)
193 unsigned long tidx
= (unsigned long)data
;
195 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
196 "reader", (unsigned long) pthread_self(),
197 (unsigned long) gettid());
206 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
207 assert(test_array
.a
== 8);
208 if (caa_unlikely(rduration
))
209 loop_sleep(rduration
);
210 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
211 URCU_TLS(nr_reads
)++;
212 if (caa_unlikely(!test_duration_read()))
216 tot_nr_reads
[tidx
] = URCU_TLS(nr_reads
);
217 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
218 "reader", (unsigned long) pthread_self(),
219 (unsigned long) gettid());
224 void *thr_writer(void *data
)
226 unsigned long wtidx
= (unsigned long)data
;
229 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
230 "writer", (unsigned long) pthread_self(),
231 (unsigned long) gettid());
241 for (tidx
= 0; tidx
< nr_readers
; tidx
++) {
242 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
246 if (caa_unlikely(wduration
))
247 loop_sleep(wduration
);
248 for (tidx
= (long)nr_readers
- 1; tidx
>= 0; tidx
--) {
249 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
251 URCU_TLS(nr_writes
)++;
252 if (caa_unlikely(!test_duration_write()))
254 if (caa_unlikely(wdelay
))
258 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
259 "writer", (unsigned long) pthread_self(),
260 (unsigned long) gettid());
261 tot_nr_writes
[wtidx
] = URCU_TLS(nr_writes
);
265 void show_usage(int argc
, char **argv
)
267 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
269 printf(" [-r] [-w] (yield reader and/or writer)");
271 printf(" [-d delay] (writer period (us))");
272 printf(" [-c duration] (reader C.S. duration (in loops))");
273 printf(" [-e duration] (writer C.S. duration (in loops))");
274 printf(" [-v] (verbose output)");
275 printf(" [-a cpu#] [-a cpu#]... (affinity)");
279 int main(int argc
, char **argv
)
282 pthread_t
*tid_reader
, *tid_writer
;
284 unsigned long long tot_reads
= 0, tot_writes
= 0;
288 show_usage(argc
, argv
);
293 err
= sscanf(argv
[1], "%u", &nr_readers
);
295 show_usage(argc
, argv
);
299 err
= sscanf(argv
[2], "%u", &nr_writers
);
301 show_usage(argc
, argv
);
305 err
= sscanf(argv
[3], "%lu", &duration
);
307 show_usage(argc
, argv
);
311 for (i
= 4; i
< argc
; i
++) {
312 if (argv
[i
][0] != '-')
314 switch (argv
[i
][1]) {
317 yield_active
|= YIELD_READ
;
320 yield_active
|= YIELD_WRITE
;
325 show_usage(argc
, argv
);
329 cpu_affinities
[next_aff
++] = a
;
331 printf_verbose("Adding CPU %d affinity\n", a
);
335 show_usage(argc
, argv
);
338 rduration
= atol(argv
[++i
]);
342 show_usage(argc
, argv
);
345 wdelay
= atol(argv
[++i
]);
349 show_usage(argc
, argv
);
352 wduration
= atol(argv
[++i
]);
360 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
361 duration
, nr_readers
, nr_writers
);
362 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
363 printf_verbose("Reader duration : %lu loops.\n", rduration
);
364 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
365 "main", (unsigned long) pthread_self(), (unsigned long) gettid());
367 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
368 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
369 tot_nr_reads
= malloc(sizeof(*tot_nr_reads
) * nr_readers
);
370 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
371 per_thread_lock
= malloc(sizeof(*per_thread_lock
) * nr_readers
);
372 for (i
= 0; i
< nr_readers
; i
++) {
373 err
= pthread_mutex_init(&per_thread_lock
[i
].lock
, NULL
);
380 for (i
= 0; i
< nr_readers
; i
++) {
381 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
386 for (i
= 0; i
< nr_writers
; i
++) {
387 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
401 for (i
= 0; i
< nr_readers
; i
++) {
402 err
= pthread_join(tid_reader
[i
], &tret
);
405 tot_reads
+= tot_nr_reads
[i
];
407 for (i
= 0; i
< nr_writers
; i
++) {
408 err
= pthread_join(tid_writer
[i
], &tret
);
411 tot_writes
+= tot_nr_writes
[i
];
414 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
416 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
418 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
419 argv
[0], duration
, nr_readers
, rduration
, wduration
,
420 nr_writers
, wdelay
, tot_reads
, tot_writes
,
421 tot_reads
+ tot_writes
);
427 free(per_thread_lock
);