From 3bb85e8443d626ee71a4126dbe6ebcaf751527f1 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Sat, 30 Jan 2016 22:03:39 -0700 Subject: [PATCH] Add a note of what is the default value for random_generator Signed-off-by: Jens Axboe --- HOWTO | 4 +++- fio.1 | 4 +++- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/HOWTO b/HOWTO index 7c24c1b7..4a910a1a 100644 --- a/HOWTO +++ b/HOWTO @@ -1013,7 +1013,9 @@ random_generator=str Fio supports the following engines for generating typically good enough. LFSR only works with single block sizes, not with workloads that use multiple block sizes. If used with such a workload, fio may read or write - some blocks multiple times. + some blocks multiple times. The default value is tausworthe, + unless the required space exceeds 2^32 blocks. If it does, + then tausworthe64 is selected automatically. nice=int Run the job with the given nice value. See man nice(2). diff --git a/fio.1 b/fio.1 index 7bdfea3f..6cc6379e 100644 --- a/fio.1 +++ b/fio.1 @@ -920,7 +920,9 @@ guarantees that we never generate the same offset twice, and it's also less computationally expensive. It's not a true random generator, however, though for IO purposes it's typically good enough. LFSR only works with single block sizes, not with workloads that use multiple block sizes. If used with such a -workload, fio may read or write some blocks multiple times. +workload, fio may read or write some blocks multiple times. The default +value is tausworthe, unless the required space exceeds 2^32 blocks. If it does, +then tausworthe64 is selected automatically. .TP .BI nice \fR=\fPint Run job with given nice value. See \fBnice\fR\|(2). -- 2.25.1