From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Thu, 20 Feb 2014 09:03:10 -0800 From: Jens Axboe Subject: Re: [patch 4/9] fio: provide an option for a startdelay range Message-ID: <20140220170310.GA30251@kernel.dk> References: <20140220132050.860880543@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140220132050.860880543@linux.vnet.ibm.com> To: ehrhardt@linux.vnet.ibm.com Cc: fio@vger.kernel.org, oberpar@linux.vnet.ibm.com List-ID: On Thu, Feb 20 2014, ehrhardt@linux.vnet.ibm.com wrote: > *Resend with hopefully non mangled patches* > References: <20140220131958.965092001@linux.vnet.ibm.com> > Content-Disposition: inline; filename=startdelay-range.diff > > From: Christian Ehrhardt > > This patch allows the specification of start delay as range. > With a range each thread will chose an individual startdelay out of the range. > > That solves an issue of startdelay being the same for each numjob clone and > that way spreads all kind of activities e.g. that all clones with mixed r/w > jobs switch r/w at the same time. > Also all kind of other "thundering herd" issues can be softened by some > time spread due to this option. > > Signed-off-by: Christian Ehrhardt You forgot the options part for thread_options.h. -- Jens Axboe