X-Git-Url: https://git.lttng.org/?p=urcu.git;a=blobdiff_plain;f=test_qsbr.c;h=af5ccfd58317d06d5c1e2d6c37ac0f268b0c5e16;hp=82521efcf83a9babbf743f7741ad05a473efabb6;hb=2a7ac59da1436b86d7cb59fb8b5712c7d98c1519;hpb=59d5a40624428364374c306409979155beddfaac diff --git a/test_qsbr.c b/test_qsbr.c index 82521ef..af5ccfd 100644 --- a/test_qsbr.c +++ b/test_qsbr.c @@ -20,6 +20,7 @@ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ +#define _GNU_SOURCE #include #include #include @@ -30,9 +31,16 @@ #include #include #include +#include #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) @@ -57,12 +65,49 @@ struct test_array { static volatile int test_go, test_stop; -static int wdelay; +static unsigned long wdelay; static struct test_array *test_rcu_pointer; static unsigned long duration; +/* read-side C.S. duration, in loops */ +static unsigned long rduration; + +static inline void loop_sleep(unsigned long l) +{ + while(l-- != 0) + 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; + +static void set_affinity(void) +{ + cpu_set_t mask; + int cpu; + + if (!use_affinity) + return; + + cpu = cpu_affinities[next_aff++]; + CPU_ZERO(&mask); + CPU_SET(cpu, &mask); + sched_setaffinity(0, sizeof(mask), &mask); +} + + + /* * returns 0 if test should end. */ @@ -146,9 +191,11 @@ void *thr_reader(void *_count) unsigned long long *count = _count; struct test_array *local_ptr; - 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(); + rcu_register_thread(); while (!test_go) @@ -162,6 +209,8 @@ void *thr_reader(void *_count) debug_yield_read(); if (local_ptr) assert(local_ptr->a == 8); + if (unlikely(rduration)) + loop_sleep(rduration); _rcu_read_unlock(); nr_reads++; /* QS each 1024 reads */ @@ -174,7 +223,7 @@ void *thr_reader(void *_count) rcu_unregister_thread(); *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); @@ -185,9 +234,11 @@ void *thr_writer(void *_count) unsigned long long *count = _count; struct test_array *new, *old; - 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) { } @@ -210,10 +261,10 @@ 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); @@ -226,6 +277,9 @@ void show_usage(int argc, char **argv) printf(" [-r] [-w] (yield reader and/or writer)"); #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"); } @@ -236,7 +290,7 @@ int main(int argc, char **argv) void *tret; unsigned long long *count_reader, *count_writer; unsigned long long tot_reads = 0, tot_writes = 0; - int i; + int i, a; if (argc < 4) { show_usage(argc, argv); @@ -273,20 +327,41 @@ int main(int argc, char **argv) yield_active |= YIELD_WRITE; break; #endif + case 'a': + if (argc < i + 2) { + show_usage(argc, argv); + return -1; + } + a = atoi(argv[++i]); + cpu_affinities[next_aff++] = a; + use_affinity = 1; + printf_verbose("Adding CPU %d affinity\n", a); + break; + case 'c': + if (argc < i + 2) { + show_usage(argc, argv); + return -1; + } + 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()); test_array = malloc(sizeof(*test_array) * ARRAY_SIZE); @@ -295,6 +370,8 @@ int main(int argc, char **argv) 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]); @@ -329,8 +406,14 @@ int main(int argc, char **argv) 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); test_array_free(test_rcu_pointer); free(test_array); free(tid_reader);