update license

[urcu.git] / test_urcu_timing.c

diff --git a/test_urcu_timing.c b/test_urcu_timing.c
index 5065891a50af55b7bb10e9d1a788020f19a3bbbd..8577b8f092e472f2e25fc5e0e4c10d070320a949 100644 (file)
--- a/test_urcu_timing.c
+++ b/test_urcu_timing.c
@@ -32,6 +32,9 @@
 #include <sys/syscall.h>
 #include <arch.h>
 
+/* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
+#define CACHE_LINE_SIZE 4096
+
 #if defined(_syscall0)
 _syscall0(pid_t, gettid)
 #elif defined(__NR_gettid)
@@ -87,11 +90,14 @@ static struct test_array *test_rcu_pointer;
 #define INNER_WRITE_LOOP 200U
 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
 
-#define NR_READ 10
-#define NR_WRITE 9
+static int num_read;
+static int num_write;
+
+#define NR_READ num_read
+#define NR_WRITE num_write
 
-static cycles_t reader_time[NR_READ] __attribute__((aligned(128)));
-static cycles_t writer_time[NR_WRITE] __attribute__((aligned(128)));
+static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time;
+static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time;
 
 void *thr_reader(void *arg)
 {
@@ -140,8 +146,8 @@ void *thr_writer(void *arg)
        sleep(2);
 
        for (i = 0; i < OUTER_WRITE_LOOP; i++) {
-               time1 = get_cycles();
                for (j = 0; j < INNER_WRITE_LOOP; j++) {
+                       time1 = get_cycles();
                        new = malloc(sizeof(struct test_array));
                        rcu_copy_mutex_lock();
                        old = test_rcu_pointer;
@@ -156,10 +162,10 @@ void *thr_writer(void *arg)
                                old->a = 0;
                        }
                        free(old);
+                       time2 = get_cycles();
+                       writer_time[(unsigned long)arg] += time2 - time1;
+                       usleep(1);
                }
-               time2 = get_cycles();
-               writer_time[(unsigned long)arg] += time2 - time1;
-               usleep(1);
        }
 
        printf("thread_end %s, thread id : %lx, tid %lu\n",
@@ -167,15 +173,27 @@ void *thr_writer(void *arg)
        return ((void*)2);
 }
 
-int main()
+int main(int argc, char **argv)
 {
        int err;
-       pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE];
+       pthread_t *tid_reader, *tid_writer;
        void *tret;
        int i;
        cycles_t tot_rtime = 0;
        cycles_t tot_wtime = 0;
 
+       if (argc < 2) {
+               printf("Usage : %s nr_readers nr_writers\n", argv[0]);
+               exit(-1);
+       }
+       num_read = atoi(argv[1]);
+       num_write = atoi(argv[2]);
+
+       reader_time = malloc(sizeof(*reader_time) * num_read);
+       writer_time = malloc(sizeof(*writer_time) * num_write);
+       tid_reader = malloc(sizeof(*tid_reader) * num_read);
+       tid_writer = malloc(sizeof(*tid_writer) * num_write);
+
        printf("thread %-6s, thread id : %lx, tid %lu\n",
                        "main", pthread_self(), (unsigned long)gettid());
 
@@ -212,5 +230,10 @@ int main()
        printf("Time per write : %g cycles\n",
               (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
 
+       free(reader_time);
+       free(writer_time);
+       free(tid_reader);
+       free(tid_writer);
+
        return 0;
 }