Switch to using our internal Tausworthe based random generator for offsets
It's both faster and more exhaustive than what is available on
glibc on my test systems. So no downsides, and the upside of having
the same offset generator across all platforms.
This will change the random series, so could alter performance for
your workload since the pattern will be different in sequence. There's
an option to revert to the OS generator, you can add use_us_rand=1
on your job files to retain the old generator offsets.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/options.c b/options.c
index 55d11ae..28a17cf 100644
--- a/options.c
+++ b/options.c
@@ -1116,6 +1116,14 @@
.parent = "rw",
},
{
+ .name = "use_os_rand",
+ .type = FIO_OPT_BOOL,
+ .off1 = td_var_offset(use_os_rand),
+ .help = "Set to use OS random generator",
+ .def = "0",
+ .parent = "rw",
+ },
+ {
.name = "norandommap",
.type = FIO_OPT_STR_SET,
.off1 = td_var_offset(norandommap),