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 struct per_thread_lock
{
71 } __attribute__((aligned(CACHE_LINE_SIZE
))); /* cache-line aligned */
73 static struct per_thread_lock
*per_thread_lock
;
75 static volatile int test_go
, test_stop
;
77 static unsigned long wdelay
;
79 static volatile struct test_array test_array
= { 8 };
81 static unsigned long duration
;
83 /* read-side C.S. duration, in loops */
84 static unsigned long rduration
;
86 static inline void loop_sleep(unsigned long l
)
92 static int verbose_mode
;
94 #define printf_verbose(fmt, args...) \
100 static unsigned int cpu_affinities
[NR_CPUS
];
101 static unsigned int next_aff
= 0;
102 static int use_affinity
= 0;
104 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
106 #ifndef HAVE_CPU_SET_T
107 typedef unsigned long cpu_set_t
;
108 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
109 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
112 static void set_affinity(void)
121 #if HAVE_SCHED_SETAFFINITY
122 ret
= pthread_mutex_lock(&affinity_mutex
);
124 perror("Error in pthread mutex lock");
127 cpu
= cpu_affinities
[next_aff
++];
128 ret
= pthread_mutex_unlock(&affinity_mutex
);
130 perror("Error in pthread mutex unlock");
135 #if SCHED_SETAFFINITY_ARGS == 2
136 sched_setaffinity(0, &mask
);
138 sched_setaffinity(0, sizeof(mask
), &mask
);
140 #endif /* HAVE_SCHED_SETAFFINITY */
144 * returns 0 if test should end.
146 static int test_duration_write(void)
151 static int test_duration_read(void)
156 static unsigned long long __thread nr_writes
;
157 static unsigned long long __thread nr_reads
;
160 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_writes
;
162 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_reads
;
164 static unsigned int nr_readers
;
165 static unsigned int nr_writers
;
167 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
169 void rcu_copy_mutex_lock(void)
172 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
174 perror("Error in pthread mutex lock");
179 void rcu_copy_mutex_unlock(void)
183 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
185 perror("Error in pthread mutex unlock");
190 void *thr_reader(void *data
)
192 unsigned long tidx
= (unsigned long)data
;
194 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
195 "reader", pthread_self(), (unsigned long)gettid());
204 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
205 assert(test_array
.a
== 8);
206 if (unlikely(rduration
))
207 loop_sleep(rduration
);
208 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
210 if (unlikely(!test_duration_read()))
214 tot_nr_reads
[tidx
] = nr_reads
;
215 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
216 "reader", pthread_self(), (unsigned long)gettid());
221 void *thr_writer(void *data
)
223 unsigned long wtidx
= (unsigned long)data
;
226 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
227 "writer", pthread_self(), (unsigned long)gettid());
237 for (tidx
= 0; tidx
< nr_readers
; tidx
++) {
238 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
242 for (tidx
= (long)nr_readers
- 1; tidx
>= 0; tidx
--) {
243 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
246 if (unlikely(!test_duration_write()))
248 if (unlikely(wdelay
))
252 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
253 "writer", pthread_self(), (unsigned long)gettid());
254 tot_nr_writes
[wtidx
] = nr_writes
;
258 void show_usage(int argc
, char **argv
)
260 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
262 printf(" [-r] [-w] (yield reader and/or writer)");
264 printf(" [-d delay] (writer period (us))");
265 printf(" [-c duration] (reader C.S. duration (in loops))");
266 printf(" [-v] (verbose output)");
267 printf(" [-a cpu#] [-a cpu#]... (affinity)");
271 int main(int argc
, char **argv
)
274 pthread_t
*tid_reader
, *tid_writer
;
276 unsigned long long *count_reader
, *count_writer
;
277 unsigned long long tot_reads
= 0, tot_writes
= 0;
281 show_usage(argc
, argv
);
286 err
= sscanf(argv
[1], "%u", &nr_readers
);
288 show_usage(argc
, argv
);
292 err
= sscanf(argv
[2], "%u", &nr_writers
);
294 show_usage(argc
, argv
);
298 err
= sscanf(argv
[3], "%lu", &duration
);
300 show_usage(argc
, argv
);
304 for (i
= 4; i
< argc
; i
++) {
305 if (argv
[i
][0] != '-')
307 switch (argv
[i
][1]) {
310 yield_active
|= YIELD_READ
;
313 yield_active
|= YIELD_WRITE
;
318 show_usage(argc
, argv
);
322 cpu_affinities
[next_aff
++] = a
;
324 printf_verbose("Adding CPU %d affinity\n", a
);
328 show_usage(argc
, argv
);
331 rduration
= atol(argv
[++i
]);
335 show_usage(argc
, argv
);
338 wdelay
= atol(argv
[++i
]);
346 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
347 duration
, nr_readers
, nr_writers
);
348 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
349 printf_verbose("Reader duration : %lu loops.\n", rduration
);
350 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
351 "main", pthread_self(), (unsigned long)gettid());
353 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
354 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
355 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
356 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
357 tot_nr_reads
= malloc(sizeof(*tot_nr_reads
) * nr_readers
);
358 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
359 per_thread_lock
= malloc(sizeof(*per_thread_lock
) * nr_readers
);
363 for (i
= 0; i
< nr_readers
; i
++) {
364 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
369 for (i
= 0; i
< nr_writers
; i
++) {
370 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
384 for (i
= 0; i
< nr_readers
; i
++) {
385 err
= pthread_join(tid_reader
[i
], &tret
);
388 tot_reads
+= tot_nr_reads
[i
];
390 for (i
= 0; i
< nr_writers
; i
++) {
391 err
= pthread_join(tid_writer
[i
], &tret
);
394 tot_writes
+= tot_nr_writes
[i
];
397 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
399 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
401 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
402 argv
[0], duration
, nr_readers
, rduration
,
403 nr_writers
, wdelay
, tot_reads
, tot_writes
,
404 tot_reads
+ tot_writes
);
412 free(per_thread_lock
);