filebench/common/fb_random.c

179 rand_uniform_get(randdist_t *rndp)
183 	dmin = (double)rndp->rnd_vint_min;
184 	dround = (double)rndp->rnd_vint_round;
186 	dprob = (*rndp->rnd_src)(rndp->rnd_xi);
188 	dres = (dprob * (2.0 * (rndp->rnd_dbl_mean - dmin))) + dmin;
201 rand_gamma_get(randdist_t *rndp)
205 	dmin = (double)rndp->rnd_vint_min;
206 	dround = (double)rndp->rnd_vint_round;
208 	dmult = (rndp->rnd_dbl_mean - dmin) / rndp->rnd_dbl_gamma;
210 	dres = gamma_dist_knuth_src(rndp->rnd_dbl_gamma,
211 	    dmult, rndp->rnd_src, rndp->rnd_xi) + dmin;
224 rand_table_get(randdist_t *rndp)
229 	dmin = (double)rndp->rnd_vint_min;
230 	dround = (double)rndp->rnd_vint_round;
232 	dprob = (*rndp->rnd_src)(rndp->rnd_xi);
237 	dtabres = (rndp->rnd_rft[idx].rf_base +
238 	    (rndp->rnd_rft[idx].rf_range * (dprcnt - (double)idx)));
240 	dsclres = (dtabres * (rndp->rnd_dbl_mean - dmin)) + dmin;
252 rand_seed_set(randdist_t *rndp)
260 	temp1.ll = (uint64_t)avd_get_int(rndp->rnd_seed);
265 		rndp->rnd_xi[idx] = temp1.w[3-idx];
267 		rndp->rnd_xi[idx] = temp1.w[idx];
279 	randdist_t *rndp;
281 	if ((rndp = (randdist_t *)ipc_malloc(FILEBENCH_RANDDIST)) == NULL) {
287 	rndp->rnd_next = filebench_shm->shm_rand_list;
288 	filebench_shm->shm_rand_list = rndp;
290 	return (rndp);
299 randdist_init_one(randdist_t *rndp)
306 	rndp->rnd_dbl_gamma = (double)avd_get_int(rndp->rnd_gamma) / 1000.0;
307 	if (rndp->rnd_mean != NULL)
308 		rndp->rnd_dbl_mean  = (double)avd_get_int(rndp->rnd_mean);
310 		rndp->rnd_dbl_mean = rndp->rnd_dbl_gamma;
313 	rndp->rnd_vint_min  = avd_get_int(rndp->rnd_min);
314 	rndp->rnd_vint_round  = avd_get_int(rndp->rnd_round);
318 	    rndp->rnd_var->var_name, rndp->rnd_dbl_mean, rndp->rnd_dbl_gamma,
319 	    (u_longlong_t)rndp->rnd_vint_min);
322 	switch (rndp->rnd_type & RAND_TYPE_MASK) {
324 		rndp->rnd_get = rand_uniform_get;
328 		rndp->rnd_get = rand_gamma_get;
332 		rndp->rnd_get = rand_table_get;
342 	if (rndp->rnd_type & RAND_SRC_GENERATOR) {
343 		rndp->rnd_src = rand_src_rand48;
344 		rand_seed_set(rndp);
346 		rndp->rnd_src = rand_src_urandom;
350 	if ((rdte_hdp = rndp->rnd_probtabs) == NULL)
377 			rndp->rnd_rft[pteidx].rf_base = dmin;
378 			rndp->rnd_rft[pteidx].rf_range = dmax - dmin;
389 	if (rndp->rnd_dbl_mean == 0.0)
390 		rndp->rnd_dbl_mean = (double)tablemean / (double)PF_TAB_SIZE;
398 			rndp->rnd_rft[pteidx].rf_base = 0.0;
399 			rndp->rnd_rft[pteidx].rf_range = 0.0;
406 		rndp->rnd_rft[pteidx].rf_base =
407 		    ((rndp->rnd_rft[pteidx].rf_base - tablemin) / tablemean);
408 		rndp->rnd_rft[pteidx].rf_range =
409 		    (rndp->rnd_rft[pteidx].rf_range / tablemean);
419 	randdist_t *rndp;
421 	for (rndp = filebench_shm->shm_rand_list; rndp; rndp = rndp->rnd_next)
422 		randdist_init_one(rndp);