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 static pthread_mutex_t lock
;
69 static volatile int test_go
, test_stop
;
71 static unsigned long wdelay
;
73 static volatile struct test_array test_array
= { 8 };
75 static unsigned long duration
;
77 /* read-side C.S. duration, in loops */
78 static unsigned long rduration
;
80 static inline void loop_sleep(unsigned long l
)
86 static int verbose_mode
;
88 #define printf_verbose(fmt, args...) \
95 * returns 0 if test should end.
97 static int test_duration_write(void)
102 static int test_duration_read(void)
107 static unsigned long long __thread nr_writes
;
108 static unsigned long long __thread nr_reads
;
111 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_writes
;
113 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_reads
;
115 static unsigned int nr_readers
;
116 static unsigned int nr_writers
;
118 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
120 void rcu_copy_mutex_lock(void)
123 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
125 perror("Error in pthread mutex lock");
130 void rcu_copy_mutex_unlock(void)
134 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
136 perror("Error in pthread mutex unlock");
141 void *thr_reader(void *data
)
143 unsigned long tidx
= (unsigned long)data
;
145 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
146 "reader", pthread_self(), (unsigned long)gettid());
153 pthread_mutex_lock(&lock
);
154 assert(test_array
.a
== 8);
155 if (unlikely(rduration
))
156 loop_sleep(rduration
);
157 pthread_mutex_unlock(&lock
);
159 if (unlikely(!test_duration_read()))
163 tot_nr_reads
[tidx
] = nr_reads
;
164 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
165 "reader", pthread_self(), (unsigned long)gettid());
170 void *thr_writer(void *data
)
172 unsigned long wtidx
= (unsigned long)data
;
174 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
175 "writer", pthread_self(), (unsigned long)gettid());
183 pthread_mutex_lock(&lock
);
186 pthread_mutex_unlock(&lock
);
188 if (unlikely(!test_duration_write()))
190 if (unlikely(wdelay
))
194 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
195 "writer", pthread_self(), (unsigned long)gettid());
196 tot_nr_writes
[wtidx
] = nr_writes
;
200 void show_usage(int argc
, char **argv
)
202 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
204 printf(" [-r] [-w] (yield reader and/or writer)");
206 printf(" [-d delay] (writer period (us))");
207 printf(" [-c duration] (reader C.S. duration (in loops))");
208 printf(" [-v] (verbose output)");
209 printf(" [-a cpu#] [-a cpu#]... (affinity)");
215 int main(int argc
, char **argv
)
218 pthread_t
*tid_reader
, *tid_writer
;
220 unsigned long long *count_reader
, *count_writer
;
221 unsigned long long tot_reads
= 0, tot_writes
= 0;
223 int use_affinity
= 0;
226 show_usage(argc
, argv
);
231 err
= sscanf(argv
[1], "%u", &nr_readers
);
233 show_usage(argc
, argv
);
237 err
= sscanf(argv
[2], "%u", &nr_writers
);
239 show_usage(argc
, argv
);
243 err
= sscanf(argv
[3], "%lu", &duration
);
245 show_usage(argc
, argv
);
251 for (i
= 4; i
< argc
; i
++) {
252 if (argv
[i
][0] != '-')
254 switch (argv
[i
][1]) {
257 yield_active
|= YIELD_READ
;
260 yield_active
|= YIELD_WRITE
;
265 show_usage(argc
, argv
);
269 CPU_SET(a
, &affinity
);
271 printf_verbose("Adding CPU %d affinity\n", a
);
275 show_usage(argc
, argv
);
278 rduration
= atol(argv
[++i
]);
282 show_usage(argc
, argv
);
285 wdelay
= atol(argv
[++i
]);
293 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
294 duration
, nr_readers
, nr_writers
);
295 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
296 printf_verbose("Reader duration : %lu loops.\n", rduration
);
297 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
298 "main", pthread_self(), (unsigned long)gettid());
301 && sched_setaffinity(0, sizeof(affinity
), &affinity
) < 0) {
302 perror("sched_setaffinity");
306 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
307 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
308 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
309 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
310 tot_nr_reads
= malloc(sizeof(*tot_nr_reads
) * nr_readers
);
311 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
313 for (i
= 0; i
< nr_readers
; i
++) {
314 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
319 for (i
= 0; i
< nr_writers
; i
++) {
320 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
334 for (i
= 0; i
< nr_readers
; i
++) {
335 err
= pthread_join(tid_reader
[i
], &tret
);
338 tot_reads
+= tot_nr_reads
[i
];
340 for (i
= 0; i
< nr_writers
; i
++) {
341 err
= pthread_join(tid_writer
[i
], &tret
);
344 tot_writes
+= tot_nr_writes
[i
];
347 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
349 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
351 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
352 argv
[0], duration
, nr_readers
, rduration
,
353 nr_writers
, wdelay
, tot_reads
, tot_writes
,
354 tot_reads
+ tot_writes
);