From: Gurudas Pai <gurudas.pai@oracle.com>
Date: Fri, 8 Feb 2008 07:50:14 +0000 (+0100)
Subject: fio: HOWTO update
X-Git-Tag: fio-1.18.1~3
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=36ecec830e25ce8f707632c464e366b21a0b0f4d

fio: HOWTO update

In case of  cpuio , on smp machines we need increase numjobs
to <num of cpu's> to get the desired load across cpu's.
Just updated HOWTO with this info.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/HOWTO b/HOWTO
index 0d3d7759..d8c6b941 100644
--- a/HOWTO
+++ b/HOWTO
@@ -383,7 +383,10 @@ ioengine=str	Defines how the job issues io to the file. The following
 				cycles according to the cpuload= and
 				cpucycle= options. Setting cpuload=85
 				will cause that job to do nothing but burn
-				85% of the CPU.
+				85% of the CPU. In case of SMP machines,
+				use numjobs=<no_of_cpu> to get desired CPU
+				usage, as the cpuload only loads a single
+				CPU at the desired rate.
 
 			guasi	The GUASI IO engine is the Generic Userspace
 				Asyncronous Syscall Interface approach