X-Git-Url: https://git.lttng.org/?p=urcu.git;a=blobdiff_plain;f=test_qsbr.c;h=af5ccfd58317d06d5c1e2d6c37ac0f268b0c5e16;hp=f56234b564c8bac4a6d01ff1b2eede53beba3e0f;hb=2a7ac59da1436b86d7cb59fb8b5712c7d98c1519;hpb=9e97e4783f9b20f5d261d12acb4980b1908aa5cd

diff --git a/test_qsbr.c b/test_qsbr.c
index f56234b..af5ccfd 100644
--- a/test_qsbr.c
+++ b/test_qsbr.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)
@@ -59,12 +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.
  */
@@ -148,9 +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)
@@ -164,6 +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 */
@@ -176,7 +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);
 
@@ -187,9 +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)
 	{
 	}
@@ -212,10 +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);
@@ -228,12 +277,12 @@ 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");
 }
 
-cpu_set_t affinity;
-
 int main(int argc, char **argv)
 {
 	int err;
@@ -242,7 +291,6 @@ 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);
@@ -267,8 +315,6 @@ int main(int argc, char **argv)
 		return -1;
 	}
 
-	CPU_ZERO(&affinity);
-
 	for (i = 4; i < argc; i++) {
 		if (argv[i][0] != '-')
 			continue;
@@ -287,38 +333,45 @@ 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 = 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);
-	}
-
 	test_array = malloc(sizeof(*test_array) * ARRAY_SIZE);
 	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]);
@@ -353,8 +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);