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.
24 #include "../config.h"
29 #include <sys/types.h>
34 #include <sys/syscall.h>
38 #include <urcu/arch.h>
40 /* hardcoded number of CPUs */
43 #if defined(_syscall0)
44 _syscall0(pid_t
, gettid
)
45 #elif defined(__NR_gettid)
46 static inline pid_t
gettid(void)
48 return syscall(__NR_gettid
);
51 #warning "use pid as tid"
52 static inline pid_t
gettid(void)
58 #ifndef DYNAMIC_LINK_TEST
61 #define debug_yield_read()
69 static pthread_mutex_t lock
;
71 static volatile int test_go
, test_stop
;
73 static unsigned long wdelay
;
75 static volatile struct test_array test_array
= { 8 };
77 static unsigned long duration
;
79 /* read-side C.S. duration, in loops */
80 static unsigned long rduration
;
82 static inline void loop_sleep(unsigned long l
)
88 static int verbose_mode
;
90 #define printf_verbose(fmt, args...) \
96 static unsigned int cpu_affinities
[NR_CPUS
];
97 static unsigned int next_aff
= 0;
98 static int use_affinity
= 0;
100 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
102 #ifndef HAVE_CPU_SET_T
103 typedef unsigned long cpu_set_t
;
104 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
105 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
108 static void set_affinity(void)
117 #if HAVE_SCHED_SETAFFINITY
118 ret
= pthread_mutex_lock(&affinity_mutex
);
120 perror("Error in pthread mutex lock");
123 cpu
= cpu_affinities
[next_aff
++];
124 ret
= pthread_mutex_unlock(&affinity_mutex
);
126 perror("Error in pthread mutex unlock");
131 #if SCHED_SETAFFINITY_ARGS == 2
132 sched_setaffinity(0, &mask
);
134 sched_setaffinity(0, sizeof(mask
), &mask
);
136 #endif /* HAVE_SCHED_SETAFFINITY */
140 * returns 0 if test should end.
142 static int test_duration_write(void)
147 static int test_duration_read(void)
152 static unsigned long long __thread nr_writes
;
153 static unsigned long long __thread nr_reads
;
156 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_writes
;
158 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_reads
;
160 static unsigned int nr_readers
;
161 static unsigned int nr_writers
;
163 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
165 void rcu_copy_mutex_lock(void)
168 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
170 perror("Error in pthread mutex lock");
175 void rcu_copy_mutex_unlock(void)
179 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
181 perror("Error in pthread mutex unlock");
186 void *thr_reader(void *data
)
188 unsigned long tidx
= (unsigned long)data
;
190 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
191 "reader", pthread_self(), (unsigned long)gettid());
200 pthread_mutex_lock(&lock
);
201 assert(test_array
.a
== 8);
202 if (unlikely(rduration
))
203 loop_sleep(rduration
);
204 pthread_mutex_unlock(&lock
);
206 if (unlikely(!test_duration_read()))
210 tot_nr_reads
[tidx
] = nr_reads
;
211 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
212 "reader", pthread_self(), (unsigned long)gettid());
217 void *thr_writer(void *data
)
219 unsigned long wtidx
= (unsigned long)data
;
221 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
222 "writer", pthread_self(), (unsigned long)gettid());
232 pthread_mutex_lock(&lock
);
235 pthread_mutex_unlock(&lock
);
237 if (unlikely(!test_duration_write()))
239 if (unlikely(wdelay
))
243 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
244 "writer", pthread_self(), (unsigned long)gettid());
245 tot_nr_writes
[wtidx
] = nr_writes
;
249 void show_usage(int argc
, char **argv
)
251 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
253 printf(" [-r] [-w] (yield reader and/or writer)");
255 printf(" [-d delay] (writer period (us))");
256 printf(" [-c duration] (reader C.S. duration (in loops))");
257 printf(" [-v] (verbose output)");
258 printf(" [-a cpu#] [-a cpu#]... (affinity)");
262 int main(int argc
, char **argv
)
265 pthread_t
*tid_reader
, *tid_writer
;
267 unsigned long long *count_reader
, *count_writer
;
268 unsigned long long tot_reads
= 0, tot_writes
= 0;
272 show_usage(argc
, argv
);
277 err
= sscanf(argv
[1], "%u", &nr_readers
);
279 show_usage(argc
, argv
);
283 err
= sscanf(argv
[2], "%u", &nr_writers
);
285 show_usage(argc
, argv
);
289 err
= sscanf(argv
[3], "%lu", &duration
);
291 show_usage(argc
, argv
);
295 for (i
= 4; i
< argc
; i
++) {
296 if (argv
[i
][0] != '-')
298 switch (argv
[i
][1]) {
301 yield_active
|= YIELD_READ
;
304 yield_active
|= YIELD_WRITE
;
309 show_usage(argc
, argv
);
313 cpu_affinities
[next_aff
++] = a
;
315 printf_verbose("Adding CPU %d affinity\n", a
);
319 show_usage(argc
, argv
);
322 rduration
= atol(argv
[++i
]);
326 show_usage(argc
, argv
);
329 wdelay
= atol(argv
[++i
]);
337 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
338 duration
, nr_readers
, nr_writers
);
339 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
340 printf_verbose("Reader duration : %lu loops.\n", rduration
);
341 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
342 "main", pthread_self(), (unsigned long)gettid());
344 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
345 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
346 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
347 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
348 tot_nr_reads
= malloc(sizeof(*tot_nr_reads
) * nr_readers
);
349 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
353 for (i
= 0; i
< nr_readers
; i
++) {
354 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
359 for (i
= 0; i
< nr_writers
; i
++) {
360 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
374 for (i
= 0; i
< nr_readers
; i
++) {
375 err
= pthread_join(tid_reader
[i
], &tret
);
378 tot_reads
+= tot_nr_reads
[i
];
380 for (i
= 0; i
< nr_writers
; i
++) {
381 err
= pthread_join(tid_writer
[i
], &tret
);
384 tot_writes
+= tot_nr_writes
[i
];
387 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
389 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
391 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
392 argv
[0], duration
, nr_readers
, rduration
,
393 nr_writers
, wdelay
, tot_reads
, tot_writes
,
394 tot_reads
+ tot_writes
);