X-Git-Url: http://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=test_rwlock.c;h=4cc4c07f953dc5f1ae4d43ce96fb860bcc3f5f55;hp=a6f31e31f1e7328de9a0dc2303c5591b2f2b41db;hb=538d7df5086144837beb7a9c1e2a94eb637b9904;hpb=daddf5b0bf1ec7aeaa56c278cf4c1dd1094c174a diff --git a/test_rwlock.c b/test_rwlock.c index a6f31e3..4cc4c07 100644 --- a/test_rwlock.c +++ b/test_rwlock.c @@ -35,6 +35,12 @@ #include "arch.h" +/* Make this big enough to include the POWER5+ L3 cacheline size of 256B */ +#define CACHE_LINE_SIZE 4096 + +/* hardcoded number of CPUs */ +#define NR_CPUS 16384 + #if defined(_syscall0) _syscall0(pid_t, gettid) #elif defined(__NR_gettid) @@ -65,7 +71,7 @@ pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER; static volatile int test_go, test_stop; -static int wdelay; +static unsigned long wdelay; static volatile struct test_array test_array = { 8 }; @@ -80,6 +86,45 @@ static inline void loop_sleep(unsigned long l) cpu_relax(); } +static int verbose_mode; + +#define printf_verbose(fmt, args...) \ + do { \ + if (verbose_mode) \ + printf(fmt, args); \ + } while (0) + +static unsigned int cpu_affinities[NR_CPUS]; +static unsigned int next_aff = 0; +static int use_affinity = 0; + +pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; + +static void set_affinity(void) +{ + cpu_set_t mask; + int cpu; + int ret; + + if (!use_affinity) + return; + + ret = pthread_mutex_lock(&affinity_mutex); + if (ret) { + perror("Error in pthread mutex lock"); + exit(-1); + } + cpu = cpu_affinities[next_aff++]; + ret = pthread_mutex_unlock(&affinity_mutex); + if (ret) { + perror("Error in pthread mutex unlock"); + exit(-1); + } + CPU_ZERO(&mask); + CPU_SET(cpu, &mask); + sched_setaffinity(0, sizeof(mask), &mask); +} + /* * returns 0 if test should end. */ @@ -126,9 +171,11 @@ void *thr_reader(void *_count) { unsigned long long *count = _count; - printf("thread_begin %s, thread id : %lx, tid %lu\n", + printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", "reader", pthread_self(), (unsigned long)gettid()); + set_affinity(); + while (!test_go) { } @@ -145,7 +192,7 @@ void *thr_reader(void *_count) } *count = nr_reads; - printf("thread_end %s, thread id : %lx, tid %lu\n", + printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", "reader", pthread_self(), (unsigned long)gettid()); return ((void*)1); @@ -155,9 +202,11 @@ void *thr_writer(void *_count) { unsigned long long *count = _count; - printf("thread_begin %s, thread id : %lx, tid %lu\n", + printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", "writer", pthread_self(), (unsigned long)gettid()); + set_affinity(); + while (!test_go) { } @@ -172,10 +221,10 @@ void *thr_writer(void *_count) if (unlikely(!test_duration_write())) break; if (unlikely(wdelay)) - usleep(wdelay); + loop_sleep(wdelay); } - printf("thread_end %s, thread id : %lx, tid %lu\n", + printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", "writer", pthread_self(), (unsigned long)gettid()); *count = nr_writes; return ((void*)2); @@ -189,12 +238,11 @@ void show_usage(int argc, char **argv) #endif printf(" [-d delay] (writer period (us))"); printf(" [-c duration] (reader C.S. duration (in loops))"); + printf(" [-v] (verbose output)"); printf(" [-a cpu#] [-a cpu#]... (affinity)"); printf("\n"); } -cpu_set_t affinity; - int main(int argc, char **argv) { int err; @@ -203,7 +251,6 @@ int main(int argc, char **argv) unsigned long long *count_reader, *count_writer; unsigned long long tot_reads = 0, tot_writes = 0; int i, a; - int use_affinity = 0; if (argc < 4) { show_usage(argc, argv); @@ -229,8 +276,6 @@ int main(int argc, char **argv) return -1; } - CPU_ZERO(&affinity); - for (i = 4; i < argc; i++) { if (argv[i][0] != '-') continue; @@ -249,43 +294,44 @@ int main(int argc, char **argv) return -1; } a = atoi(argv[++i]); - CPU_SET(a, &affinity); + cpu_affinities[next_aff++] = a; use_affinity = 1; - printf("Adding CPU %d affinity\n", a); + printf_verbose("Adding CPU %d affinity\n", a); break; case 'c': if (argc < i + 2) { show_usage(argc, argv); return -1; } - rduration = atoi(argv[++i]); + rduration = atol(argv[++i]); break; case 'd': if (argc < i + 2) { show_usage(argc, argv); return -1; } - wdelay = atoi(argv[++i]); + wdelay = atol(argv[++i]); + break; + case 'v': + verbose_mode = 1; break; } } - printf("running test for %lu seconds, %u readers, %u writers.\n", + printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", duration, nr_readers, nr_writers); - printf("Writer delay : %u us.\n", wdelay); - printf("thread %-6s, thread id : %lx, tid %lu\n", + printf_verbose("Writer delay : %lu loops.\n", wdelay); + printf_verbose("Reader duration : %lu loops.\n", rduration); + printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", "main", pthread_self(), (unsigned long)gettid()); - if (use_affinity - && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) { - perror("sched_setaffinity"); - exit(-1); - } 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); + next_aff = 0; + for (i = 0; i < nr_readers; i++) { err = pthread_create(&tid_reader[i], NULL, thr_reader, &count_reader[i]); @@ -319,9 +365,16 @@ int main(int argc, char **argv) exit(1); tot_writes += count_writer[i]; } - - printf("total number of reads : %llu, writes %llu\n", tot_reads, + + printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, tot_writes); + printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu " + "nr_writers %3u " + "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", + argv[0], duration, nr_readers, rduration, + nr_writers, wdelay, tot_reads, tot_writes, + tot_reads + tot_writes); + free(tid_reader); free(tid_writer); free(count_reader);