X-Git-Url: https://git.lttng.org/?p=urcu.git;a=blobdiff_plain;f=test_qsbr.c;h=af5ccfd58317d06d5c1e2d6c37ac0f268b0c5e16;hp=a8cb79946a8db0ee5160efc8bd78ab58fd10b663;hb=2a7ac59da1436b86d7cb59fb8b5712c7d98c1519;hpb=061159a0c1aba841cdaea0164afd4e67f7a1a43e diff --git a/test_qsbr.c b/test_qsbr.c index a8cb799..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 @@ -30,6 +31,15 @@ #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) @@ -53,39 +63,62 @@ struct test_array { int a; }; -static volatile int test_go; +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; -static time_t start_time; -static unsigned long __thread duration_interval; -#define DURATION_TEST_DELAY_WRITE 4 -#define DURATION_TEST_DELAY_READ 100 + +/* 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. */ 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; + return !test_stop; } 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; + return !test_stop; } static unsigned long long __thread nr_writes; @@ -158,14 +191,17 @@ 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) { } + smp_mb(); for (;;) { _rcu_read_lock(); @@ -173,18 +209,21 @@ 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++; - if (duration_interval >= DURATION_TEST_DELAY_READ - 1) + /* QS each 1024 reads */ + if (unlikely((nr_reads & ((1 << 10) - 1)) == 0)) _rcu_quiescent_state(); - if (!test_duration_read()) + if (unlikely(!test_duration_read())) break; } 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); @@ -195,12 +234,15 @@ 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) { } + smp_mb(); for (;;) { new = test_array_alloc(); @@ -216,13 +258,13 @@ void *thr_writer(void *_count) old->a = 0; test_array_free(old); nr_writes++; - if (!test_duration_write()) + if (unlikely(!test_duration_write())) break; - if (wdelay) - usleep(wdelay); + if (unlikely(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); @@ -234,7 +276,10 @@ void show_usage(int argc, char **argv) #ifdef DEBUG_YIELD printf(" [-r] [-w] (yield reader and/or writer)"); #endif - printf(" [-d delay] (writer period)"); + 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"); } @@ -245,7 +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); @@ -282,21 +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); - start_time = time(NULL); - 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); @@ -305,6 +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]); @@ -318,8 +385,14 @@ int main(int argc, char **argv) exit(1); } + smp_mb(); + test_go = 1; + sleep(duration); + + test_stop = 1; + for (i = 0; i < nr_readers; i++) { err = pthread_join(tid_reader[i], &tret); if (err != 0) @@ -333,8 +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);