rand: add 64-bit tausworthe variant with a 2^258 cycle

[fio.git] / init.c

diff --git a/init.c b/init.c
index f34e8182ce7d775b7ab36d0545135a978801d408..9f1041c7a4e7b9add4b8b1b6889473b4705b7085 100644 (file)
--- a/init.c
+++ b/init.c
@@ -496,12 +496,14 @@ static int fixed_block_size(struct thread_options *o)
 static unsigned long long get_rand_start_delay(struct thread_data *td)
 {
        unsigned long long delayrange;
+       uint64_t frand_max;
        unsigned long r;
 
        delayrange = td->o.start_delay_high - td->o.start_delay;
 
+       frand_max = rand_max(&td->delay_state);
        r = __rand(&td->delay_state);
-       delayrange = (unsigned long long) ((double) delayrange * (r / (FRAND_MAX + 1.0)));
+       delayrange = (unsigned long long) ((double) delayrange * (r / (frand_max + 1.0)));
 
        delayrange += td->o.start_delay;
        return delayrange;
@@ -827,18 +829,18 @@ static int exists_and_not_file(const char *filename)
        return 1;
 }
 
-static void td_fill_rand_seeds_internal(struct thread_data *td)
+static void td_fill_rand_seeds_internal(struct thread_data *td, int use64)
 {
-       init_rand_seed(&td->bsrange_state, td->rand_seeds[FIO_RAND_BS_OFF]);
-       init_rand_seed(&td->verify_state, td->rand_seeds[FIO_RAND_VER_OFF]);
-       init_rand_seed(&td->rwmix_state, td->rand_seeds[FIO_RAND_MIX_OFF]);
+       init_rand_seed(&td->bsrange_state, td->rand_seeds[FIO_RAND_BS_OFF], use64);
+       init_rand_seed(&td->verify_state, td->rand_seeds[FIO_RAND_VER_OFF], use64);
+       init_rand_seed(&td->rwmix_state, td->rand_seeds[FIO_RAND_MIX_OFF], use64);
 
        if (td->o.file_service_type == FIO_FSERVICE_RANDOM)
-               init_rand_seed(&td->next_file_state, td->rand_seeds[FIO_RAND_FILE_OFF]);
+               init_rand_seed(&td->next_file_state, td->rand_seeds[FIO_RAND_FILE_OFF], use64);
 
-       init_rand_seed(&td->file_size_state, td->rand_seeds[FIO_RAND_FILE_SIZE_OFF]);
-       init_rand_seed(&td->trim_state, td->rand_seeds[FIO_RAND_TRIM_OFF]);
-       init_rand_seed(&td->delay_state, td->rand_seeds[FIO_RAND_START_DELAY]);
+       init_rand_seed(&td->file_size_state, td->rand_seeds[FIO_RAND_FILE_SIZE_OFF], use64);
+       init_rand_seed(&td->trim_state, td->rand_seeds[FIO_RAND_TRIM_OFF], use64);
+       init_rand_seed(&td->delay_state, td->rand_seeds[FIO_RAND_START_DELAY], use64);
 
        if (!td_random(td))
                return;
@@ -846,14 +848,16 @@ static void td_fill_rand_seeds_internal(struct thread_data *td)
        if (td->o.rand_repeatable)
                td->rand_seeds[FIO_RAND_BLOCK_OFF] = FIO_RANDSEED * td->thread_number;
 
-       init_rand_seed(&td->random_state, td->rand_seeds[FIO_RAND_BLOCK_OFF]);
-       init_rand_seed(&td->seq_rand_state[DDIR_READ], td->rand_seeds[FIO_RAND_SEQ_RAND_READ_OFF]);
-       init_rand_seed(&td->seq_rand_state[DDIR_WRITE], td->rand_seeds[FIO_RAND_SEQ_RAND_WRITE_OFF]);
-       init_rand_seed(&td->seq_rand_state[DDIR_TRIM], td->rand_seeds[FIO_RAND_SEQ_RAND_TRIM_OFF]);
+       init_rand_seed(&td->random_state, td->rand_seeds[FIO_RAND_BLOCK_OFF], use64);
+       init_rand_seed(&td->seq_rand_state[DDIR_READ], td->rand_seeds[FIO_RAND_SEQ_RAND_READ_OFF], use64);
+       init_rand_seed(&td->seq_rand_state[DDIR_WRITE], td->rand_seeds[FIO_RAND_SEQ_RAND_WRITE_OFF], use64);
+       init_rand_seed(&td->seq_rand_state[DDIR_TRIM], td->rand_seeds[FIO_RAND_SEQ_RAND_TRIM_OFF], use64);
 }
 
 void td_fill_rand_seeds(struct thread_data *td)
 {
+       int use64;
+
        if (td->o.allrand_repeatable) {
                unsigned int i;
 
@@ -862,12 +866,17 @@ void td_fill_rand_seeds(struct thread_data *td)
                                + i;
        }
 
-       td_fill_rand_seeds_internal(td);
+       if (td->o.random_generator == FIO_RAND_GEN_TAUSWORTHE64)
+               use64 = 1;
+       else
+               use64 = 0;
+
+       td_fill_rand_seeds_internal(td, use64);
 
-       init_rand_seed(&td->buf_state, td->rand_seeds[FIO_RAND_BUF_OFF]);
+       init_rand_seed(&td->buf_state, td->rand_seeds[FIO_RAND_BUF_OFF], use64);
        frand_copy(&td->buf_state_prev, &td->buf_state);
 
-       init_rand_seed(&td->dedupe_state, td->rand_seeds[FIO_DEDUPE_OFF]);
+       init_rand_seed(&td->dedupe_state, td->rand_seeds[FIO_DEDUPE_OFF], use64);
 }
 
 /*