Add support for normal/gaussian random distributions

[fio.git] / options.c

diff --git a/options.c b/options.c
index 337fecdb54231fca391b837cf363f0552d03d84b..1857d4115f9a80234ec8aec2bb4a591405448a70 100644 (file)
--- a/options.c
+++ b/options.c
@@ -718,6 +718,8 @@ static int str_random_distribution_cb(void *data, const char *str)
                val = FIO_DEF_ZIPF;
        else if (td->o.random_distribution == FIO_RAND_DIST_PARETO)
                val = FIO_DEF_PARETO;
                val = FIO_DEF_ZIPF;
        else if (td->o.random_distribution == FIO_RAND_DIST_PARETO)
                val = FIO_DEF_PARETO;

+       else if (td->o.random_distribution == FIO_RAND_DIST_GAUSS)
+               val = 0.0;

        else
                return 0;
 
        else
                return 0;
 


@@ -736,13 +738,14 @@ static int str_random_distribution_cb(void *data, const char *str)
                        return 1;
                }
                td->o.zipf_theta.u.f = val;
                        return 1;
                }
                td->o.zipf_theta.u.f = val;

-       } else {
+       } else if (td->o.random_distribution == FIO_RAND_DIST_PARETO) {

                if (val <= 0.00 || val >= 1.00) {
                        log_err("fio: pareto input out of range (0 < input < 1.0)\n");
                        return 1;
                }
                td->o.pareto_h.u.f = val;
                if (val <= 0.00 || val >= 1.00) {
                        log_err("fio: pareto input out of range (0 < input < 1.0)\n");
                        return 1;
                }
                td->o.pareto_h.u.f = val;

-       }
+       } else
+               td->o.gauss_dev = val;

 
        return 0;
 }
 
        return 0;
 }


@@ -1875,6 +1878,10 @@ struct fio_option fio_options[FIO_MAX_OPTS] = {
                            .oval = FIO_RAND_DIST_PARETO,
                            .help = "Pareto distribution",
                          },
                            .oval = FIO_RAND_DIST_PARETO,
                            .help = "Pareto distribution",
                          },

+                         { .ival = "normal",
+                           .oval = FIO_RAND_DIST_GAUSS,
+                           .help = "Normal (gaussian) distribution",
+                         },

                },
                .category = FIO_OPT_C_IO,
                .group  = FIO_OPT_G_RANDOM,
                },
                .category = FIO_OPT_C_IO,
                .group  = FIO_OPT_G_RANDOM,