From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.fusionio.com ([64.244.102.31]:43085 "EHLO mx2.fusionio.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753775Ab1BFVBH (ORCPT ); Sun, 6 Feb 2011 16:01:07 -0500 Message-ID: <4D4F0C09.2010601@fusionio.com> Date: Sun, 6 Feb 2011 22:00:57 +0100 From: Jens Axboe MIME-Version: 1.0 Subject: Re: test definition help needed References: <4D4C51B2.1090700@austin.ibm.com> In-Reply-To: <4D4C51B2.1090700@austin.ibm.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Sender: fio-owner@vger.kernel.org List-Id: fio@vger.kernel.org To: Steven Pratt Cc: fio@vger.kernel.org On 2011-02-04 20:21, Steven Pratt wrote: > I am trying to create a job file that randomly select a file form an imported list and reads the entire file sequentially. Them moves to the next file. I also want multiple jobs(processe) running the same workload. I have this: > > [global] > bs=4k > time_based=1 > runtime=15m > iodepth=4 > rw=read > ioengine=libaio > time_based=1 > ramp_time=600s > norandommap > > [job1] > opendir=/${FIO_MOUNT}/session1/small_file1 > file_service_type=sequential > numjobs=8 > > > > I used file_service_type=sequential because tought without it it would > only do a single read (block) from the file before switching to a > different file, which is not what I want. The issue with this test as > written is it seems like all the fio processes choose files in the > same order so I get way more cache hits than I want. I want this to be > more of a random file selection, but with reading whole file. Any > advice? file_service_type=random: should do what you need, I think. If you ensure that is sufficiently large that the file will always be finished before you run out, then that should work. -- Jens Axboe