From 10c48e148fb55e862295fcd635fa68aa399e7362 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Tue, 9 Jun 2009 12:50:37 -0400 Subject: [PATCH 1/1] Add rwlock scalability test Signed-off-by: Mathieu Desnoyers --- Makefile | 6 +- test_rwlock.c | 292 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 297 insertions(+), 1 deletion(-) create mode 100644 test_rwlock.c diff --git a/Makefile b/Makefile index b25b241..25735dc 100644 --- a/Makefile +++ b/Makefile @@ -12,7 +12,8 @@ LDFLAGS=-lpthread SRC_DEP=`echo $^ | sed 's/[^ ]*\.h//g'` all: arch-api test_urcu test_urcu_dynamic_link test_urcu_timing \ - test_rwlock_timing test_perthreadlock_timing test_urcu_yield \ + test_rwlock_timing test_rwlock test_perthreadlock_timing \ + test_urcu_yield \ urcu-asm.S test_qsbr_timing test_qsbr urcu-asm.o urcutorture \ urcutorture-yield liburcu.so @@ -37,6 +38,9 @@ test_urcu: urcu.o test_urcu.c urcu.h test_qsbr: urcu-qsbr.o test_qsbr.c urcu-qsbr.h $(CC) ${CFLAGS} $(LDFLAGS) -o $@ $(SRC_DEP) +test_rwlock: urcu.o test_rwlock.c urcu.h + $(CC) ${CFLAGS} $(LDFLAGS) -o $@ $(SRC_DEP) + test_urcu_dynamic_link: urcu.o test_urcu.c urcu.h $(CC) ${CFLAGS} -DDYNAMIC_LINK_TEST $(LDFLAGS) -o $@ $(SRC_DEP) diff --git a/test_rwlock.c b/test_rwlock.c new file mode 100644 index 0000000..9a818ff --- /dev/null +++ b/test_rwlock.c @@ -0,0 +1,292 @@ +/* + * test_urcu.c + * + * Userspace RCU library - test program + * + * Copyright February 2009 - Mathieu Desnoyers + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#if defined(_syscall0) +_syscall0(pid_t, gettid) +#elif defined(__NR_gettid) +static inline pid_t gettid(void) +{ + return syscall(__NR_gettid); +} +#else +#warning "use pid as tid" +static inline pid_t gettid(void) +{ + return getpid(); +} +#endif + +#ifndef DYNAMIC_LINK_TEST +#define _LGPL_SOURCE +#else +#define debug_yield_read() +#endif +#include "urcu.h" + +struct test_array { + int a; +}; + +pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER; + +static volatile int test_go; + +static int wdelay; + +static struct test_array test_array = { 8 }; + +static unsigned long duration; +static time_t start_time; +static unsigned long __thread duration_interval; +#define DURATION_TEST_DELAY_WRITE 4 +#define DURATION_TEST_DELAY_READ 100 + +/* + * returns 0 if test should end. + */ +static int test_duration_write(void) +{ + if (duration_interval++ >= DURATION_TEST_DELAY_WRITE) { + duration_interval = 0; + if (time(NULL) - start_time >= duration) + return 0; + } + return 1; +} + +static int test_duration_read(void) +{ + if (duration_interval++ >= DURATION_TEST_DELAY_READ) { + duration_interval = 0; + if (time(NULL) - start_time >= duration) + return 0; + } + return 1; +} + +static unsigned long long __thread nr_writes; +static unsigned long long __thread nr_reads; + +static unsigned int nr_readers; +static unsigned int nr_writers; + +pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; + +void rcu_copy_mutex_lock(void) +{ + int ret; + ret = pthread_mutex_lock(&rcu_copy_mutex); + if (ret) { + perror("Error in pthread mutex lock"); + exit(-1); + } +} + +void rcu_copy_mutex_unlock(void) +{ + int ret; + + ret = pthread_mutex_unlock(&rcu_copy_mutex); + if (ret) { + perror("Error in pthread mutex unlock"); + exit(-1); + } +} + +void *thr_reader(void *_count) +{ + unsigned long long *count = _count; + + printf("thread_begin %s, thread id : %lx, tid %lu\n", + "reader", pthread_self(), (unsigned long)gettid()); + + while (!test_go) + { + } + + for (;;) { + pthread_rwlock_rdlock(&lock); + assert(test_array.a == 8); + pthread_rwlock_unlock(&lock); + nr_reads++; + if (!test_duration_read()) + break; + } + + *count = nr_reads; + printf("thread_end %s, thread id : %lx, tid %lu\n", + "reader", pthread_self(), (unsigned long)gettid()); + return ((void*)1); + +} + +void *thr_writer(void *_count) +{ + unsigned long long *count = _count; + + printf("thread_begin %s, thread id : %lx, tid %lu\n", + "writer", pthread_self(), (unsigned long)gettid()); + + while (!test_go) + { + } + + for (;;) { + pthread_rwlock_wrlock(&lock); + test_array.a = 8; + pthread_rwlock_unlock(&lock); + nr_writes++; + if (!test_duration_write()) + break; + if (wdelay) + usleep(wdelay); + } + + printf("thread_end %s, thread id : %lx, tid %lu\n", + "writer", pthread_self(), (unsigned long)gettid()); + *count = nr_writes; + return ((void*)2); +} + +void show_usage(int argc, char **argv) +{ + printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); +#ifdef DEBUG_YIELD + printf(" [-r] [-w] (yield reader and/or writer)"); +#endif + printf(" [-d delay] (writer period)"); + printf("\n"); +} + +int main(int argc, char **argv) +{ + int err; + pthread_t *tid_reader, *tid_writer; + void *tret; + unsigned long long *count_reader, *count_writer; + unsigned long long tot_reads = 0, tot_writes = 0; + int i; + + if (argc < 4) { + show_usage(argc, argv); + return -1; + } + + err = sscanf(argv[1], "%u", &nr_readers); + if (err != 1) { + show_usage(argc, argv); + return -1; + } + + err = sscanf(argv[2], "%u", &nr_writers); + if (err != 1) { + show_usage(argc, argv); + return -1; + } + + err = sscanf(argv[3], "%lu", &duration); + if (err != 1) { + show_usage(argc, argv); + return -1; + } + + for (i = 4; i < argc; i++) { + if (argv[i][0] != '-') + continue; + switch (argv[i][1]) { +#ifdef DEBUG_YIELD + case 'r': + yield_active |= YIELD_READ; + break; + case 'w': + yield_active |= YIELD_WRITE; + break; +#endif + case 'd': + if (argc < i + 2) { + show_usage(argc, argv); + return -1; + } + wdelay = atoi(argv[++i]); + break; + } + } + + printf("running test for %lu seconds, %u readers, %u writers.\n", + duration, nr_readers, nr_writers); + printf("Writer delay : %u us.\n", wdelay); + start_time = time(NULL); + printf("thread %-6s, thread id : %lx, tid %lu\n", + "main", pthread_self(), (unsigned long)gettid()); + + tid_reader = malloc(sizeof(*tid_reader) * nr_readers); + tid_writer = malloc(sizeof(*tid_writer) * nr_writers); + count_reader = malloc(sizeof(*count_reader) * nr_readers); + count_writer = malloc(sizeof(*count_writer) * nr_writers); + + for (i = 0; i < nr_readers; i++) { + err = pthread_create(&tid_reader[i], NULL, thr_reader, + &count_reader[i]); + if (err != 0) + exit(1); + } + for (i = 0; i < nr_writers; i++) { + err = pthread_create(&tid_writer[i], NULL, thr_writer, + &count_writer[i]); + if (err != 0) + exit(1); + } + + test_go = 1; + + for (i = 0; i < nr_readers; i++) { + err = pthread_join(tid_reader[i], &tret); + if (err != 0) + exit(1); + tot_reads += count_reader[i]; + } + for (i = 0; i < nr_writers; i++) { + err = pthread_join(tid_writer[i], &tret); + if (err != 0) + exit(1); + tot_writes += count_writer[i]; + } + + printf("total number of reads : %llu, writes %llu\n", tot_reads, + tot_writes); + free(tid_reader); + free(tid_writer); + free(count_reader); + free(count_writer); + return 0; +} -- 2.34.1