From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from brick.kernel.dk ([93.163.65.50]:45308 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751390AbZHSMvq (ORCPT ); Wed, 19 Aug 2009 08:51:46 -0400 Date: Wed, 19 Aug 2009 14:51:47 +0200 From: Jens Axboe Subject: Re: Large numbers of devices... Message-ID: <20090819125147.GB12579@kernel.dk> References: <1250530429.5341.98.camel@cail> <20090819090317.GW12579@kernel.dk> <1250686030.5589.1.camel@cail> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1250686030.5589.1.camel@cail> Sender: fio-owner@vger.kernel.org List-Id: fio@vger.kernel.org To: "Alan D. Brunelle" Cc: fio@vger.kernel.org On Wed, Aug 19 2009, Alan D. Brunelle wrote: > On Wed, 2009-08-19 at 11:03 +0200, Jens Axboe wrote: > > > > > Alan, I haven't run with that many files, so it's indeed possible that > > there's an inherent limitiation in the file selection in fio. It's not > > my best code, that part... If you have the time and inclination to jump > > in there and find out what is going on, then that would be great! > > > > OK, will do - I just wanted to check that the fio job-file looked OK. It looks fine, in fact if that is your setup, then you are not using the multi file stuff. Your job files basically creates a process per device, which should work fine as-is. You can try and play with the iodepth batching control, iodepth_batch and iodepth_batch_complete. They both default to 1, meaning that it'll submit and complete 1 command at the time. -- Jens Axboe