From 774af4a2ced9a268a47527f9f61f6d23ffe8bbe5 Mon Sep 17 00:00:00 2001 From: Song Liu Date: Mon, 9 Nov 2015 14:32:14 -0800 Subject: [PATCH] In fio.1 and HOWTO, add link to Poisson process in wikipedia Signed-off-by: Jens Axboe --- HOWTO | 7 +++++-- fio.1 | 6 ++++-- 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/HOWTO b/HOWTO index 03a0060c..f8b488fa 100644 --- a/HOWTO +++ b/HOWTO @@ -1064,8 +1064,11 @@ rate_iops_min=int If fio doesn't meet this rate of IO, it will cause the job to exit. The same format as rate is used for read vs write separation. -rate_poisson=bool When rate limited, try to simulate request flow under - Poisson process (instead of even distribution). Default: false. +rate_poisson=bool Real world random request flow follows Poisson process + (https://en.wikipedia.org/wiki/Poisson_process). With + rate_poisson=1, fio tries to simulate request flow under Poisson + process (instead of even distribution, which is the default). + Default: false. latency_target=int If set, fio will attempt to find the max performance point that the given workload will run at while maintaining a diff --git a/fio.1 b/fio.1 index 99d9f9e0..b8e31db6 100644 --- a/fio.1 +++ b/fio.1 @@ -964,8 +964,10 @@ If this rate of I/O is not met, the job will exit. The same format as \fBrate\fR is used for read vs write separation. .TP .BI rate_poisson \fR=\fPbool -When rate limited, try to simulate request flow under Poisson process (instead -of even distribution). Default: false. +Real world random request flow follows Poisson process +(https://en.wikipedia.org/wiki/Poisson_process). With \fBrate_poisson\fR=1, fio +tries to simulate request flow under Poisson process (instead of even +distribution, which is the default). Default: false. .TP .BI ratecycle \fR=\fPint Average bandwidth for \fBrate\fR and \fBratemin\fR over this number of -- 2.25.1