From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dish-sg.nttdocomo.co.jp ([202.19.227.74]:31396 "EHLO dish-sg.nttdocomo.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240558AbhDMGTr (ORCPT ); Tue, 13 Apr 2021 02:19:47 -0400 Received: from zssg-mailmd102.ddreams.local (zssg-mailmd900.ddreams.local [10.160.172.63]) by zssg-mailou104.ddreams.local (Postfix) with ESMTP id C5A1D120112 for ; Tue, 13 Apr 2021 15:14:12 +0900 (JST) Received: from t113sg-mailcc12.ddreams.local (t113sg-mailcc12.ddreams.local [100.66.13.87]) by zssg-mailmd102.ddreams.local (dDREAMS) with ESMTP id <0QRH00F49NZNPL40@dDREAMS> for fio@vger.kernel.org; Tue, 13 Apr 2021 15:14:11 +0900 (JST) Received: from t113sg-mailcc12 (localhost [127.0.0.1]) by t113sg-mailcc12.ddreams.local (unknown) with SMTP id 13D6EB8q031104 for ; Tue, 13 Apr 2021 15:14:11 +0900 Received: from zssg-mailmf103.ddreams.local (unknown [127.0.0.1]) by zssg-mailmf103.ddreams.local (Postfix) with ESMTP id 100127E603B for ; Tue, 13 Apr 2021 15:13:56 +0900 (JST) Received: from zssg-mailmf103.ddreams.local (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0C7598E6071 for ; Tue, 13 Apr 2021 15:13:56 +0900 (JST) Received: from localhost (unknown [127.0.0.1]) by IMSVA (Postfix) with SMTP id 0B5C78E6075 for ; Tue, 13 Apr 2021 15:13:56 +0900 (JST) Received: from zssg-mailmf103.ddreams.local (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BD5668E6054 for ; Tue, 13 Apr 2021 15:13:54 +0900 (JST) Received: from zssg-mailua102.ddreams.local (unknown [10.160.172.62]) by zssg-mailmf103.ddreams.local (Postfix) with ESMTP for ; Tue, 13 Apr 2021 15:13:54 +0900 (JST) Received: from [10.132.13.182] (unknown [10.160.179.1]) by zssg-mailua102.ddreams.local (dDREAMS) with ESMTPA id <0QRH00B1DNYY56E0@dDREAMS> for fio@vger.kernel.org; Tue, 13 Apr 2021 15:13:47 +0900 (JST) From: Nakajima Akira Subject: [Question] Sequential mesuaring and filename option Message-id: <059fa98d-9088-5daa-834e-5c87d60bb836@nttcom.co.jp_1> Date: Tue, 13 Apr 2021 15:13:46 +0900 MIME-version: 1.0 Content-type: text/plain; charset=utf-8; format=flowed Content-language: en-US Content-transfer-encoding: 7bit List-Id: fio@vger.kernel.org To: fio@vger.kernel.org Hi. I'm using fio for the first time. Sorry for the basic question. On RHEL 8.3 # fio -filename=/mnt/testfile -direct=1 -ioengine=libaio -rw=write -bs=1m -size=5G -numjobs=1 -runtime=60 -group_reporting -name=test IOPS=366, BW=366MiB/s But when -numjobs=10 IOPS=3358, BW=3358MiB/s This is 5 times faster than the physical speed of the HDD I am using (600MB/s). Similar results are obtained with Sequential write. Random read/write is fine.(Results are within 600MB/s) https://fio.readthedocs.io/en/latest/fio_man.html#target-file-device I refer above and use -directory=/mnt/testdir instead of -filename gave good results. Am I using the -filename option incorrectly? I confirmed this with the following ver. fio-3.26(build from git), fio-3.19-3.el8, fio-3.1-1.el7 Thanks. Nakajima.