From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from esa10.fujitsucc.c3s2.iphmx.com (esa10.fujitsucc.c3s2.iphmx.com [68.232.159.247]) by sourceware.org (Postfix) with ESMTPS id 64F103858400 for ; Tue, 28 Sep 2021 01:40:18 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 64F103858400 X-IronPort-AV: E=McAfee;i="6200,9189,10120"; a="39989151" X-IronPort-AV: E=Sophos;i="5.85,328,1624287600"; d="scan'208";a="39989151" Received: from mail-os2jpn01lp2053.outbound.protection.outlook.com (HELO JPN01-OS2-obe.outbound.protection.outlook.com) ([104.47.92.53]) by ob1.fujitsucc.c3s2.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Sep 2021 10:40:15 +0900 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=P5oVrUpHV+LOjdgzjfCht53k49JvXdexPDGm7oniZuJT3aGAFbB32OAT8AeUrCJPG4sqx3O1oZb8lU6m5tRMS/tBGMnj0ziJqYcawLLa4XdzPKgp8TWH0o7zt/tX4O0ueQq3J7tj8ny8N5eojG7yg2zARgbDjqZRgCJc3/zOzFODZatK2krF3K7i9xvuHGGMihfXc6sPcL6DrMGuRzLGGbC5/KI4x/A0TkVqAsKKBrQrrH8vvsvVwPT1MDEuDzFuMyGr0GRQrOP1lslvpYEz7fMe4XteckJCxfUGI46THw18uMSM93MHuZxDFb76BV3NBVBXuT2U9nd1UhT3H9QHvw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=cbdJAM4liWkN/NxZekHqYU6g+Wr/SKe/7YZQrN488bI=; b=agXS/jD9nxb4ErB65YtVDPeF7GRymhyfllLTpZhy1gunUqw3mG+Lqi1/kc233Q0pQWqkrZWxonWUqksIJBWQNy3jOzZETpSaMJ0xLuB2q+WagmQxZVhm2VNku8x7ps6tS9thEZ/FdOqJ5i77FaVWHQKyRETE84RBFSDDRVkRhl/uBOhhNeVBlfnqAz8BQzJ2JAlm6ANck9rVllsb/C1lF7AMwisC/MQLqIb0fzcXpdQqFfFohtA/ylu7L8gDcp1tKfSC3OorRE9ZqyV2D+pXrXJfBpsxMSGyA5H/XkB3WecMgzgmUsiHPTKIE/89VzBIlCymEuPGDVkshhK/zydOTg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=fujitsu.com; dmarc=pass action=none header.from=fujitsu.com; dkim=pass header.d=fujitsu.com; arc=none Received: from TYAPR01MB6025.jpnprd01.prod.outlook.com (2603:1096:402:36::13) by TYYPR01MB6762.jpnprd01.prod.outlook.com (2603:1096:400:cd::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4544.15; Tue, 28 Sep 2021 01:40:12 +0000 Received: from TYAPR01MB6025.jpnprd01.prod.outlook.com ([fe80::253b:6b27:fc5c:204e]) by TYAPR01MB6025.jpnprd01.prod.outlook.com ([fe80::253b:6b27:fc5c:204e%6]) with mapi id 15.20.4544.022; Tue, 28 Sep 2021 01:40:12 +0000 From: "naohirot@fujitsu.com" To: 'Wilco Dijkstra' , "'Lucas A. M. Magalhaes'" , Noah Goldstein , "libc-alpha@sourceware.org" , "naohirot@fujitsu.com" Subject: Re: [PATCH v3 2/5] benchtests: Add memset zero fill benchtest Thread-Topic: [PATCH v3 2/5] benchtests: Add memset zero fill benchtest Thread-Index: AQHXic6jy6USnJyx5kO37MI1gLA1squd9IkAgANfZaCAAOkzAIAArxWggADifACAAMeSUIAJZF/AgACj7YCAAN1nMIAJgxvy Date: Tue, 28 Sep 2021 01:40:12 +0000 Message-ID: References: <20210805074733.433430-1-naohirot@fujitsu.com> <20210805075053.433538-1-naohirot@fujitsu.com> <163130642274.404689.6991051609396665932@localhost.localdomain> <163154191414.705584.12050866556951422556@localhost.localdomain> In-Reply-To: Accept-Language: en-001, ja-JP, en-US Content-Language: aa X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_a7295cc1-d279-42ac-ab4d-3b0f4fece050_Enabled=True; MSIP_Label_a7295cc1-d279-42ac-ab4d-3b0f4fece050_SiteId=a19f121d-81e1-4858-a9d8-736e267fd4c7; MSIP_Label_a7295cc1-d279-42ac-ab4d-3b0f4fece050_SetDate=2021-09-28T01:40:11.651Z; MSIP_Label_a7295cc1-d279-42ac-ab4d-3b0f4fece050_Name=FUJITSU-RESTRICTED; 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charset="iso-2022-jp" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: fujitsu.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: TYAPR01MB6025.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 443959df-e807-47ec-0195-08d98220ea0e X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Sep 2021 01:40:12.6548 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a19f121d-81e1-4858-a9d8-736e267fd4c7 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: w85tW88yATiowujKkBnahPJRN3zzKZMGr8aJFbJvNt4uyVPk/3ogXeEqAJjBwLRwYjrjcId4cpU8iwHoYvLUMQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYYPR01MB6762 X-Spam-Status: No, score=-3.1 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, KAM_DMARC_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_NONE, TXREP autolearn=no autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 28 Sep 2021 01:40:20 -0000 Hi Wilco,=0A= =0A= Let me ping you again if V5 [1] is OK or not.=0A= [1]https://sourceware.org/pipermail/libc-alpha/2021-September/131245.html= =0A= ________________________________________=0A= From: Tamura, Naohiro/=1B$BEDB<=1B(B =1B$BD>9-=1B(B = =0A= Sent: Wednesday, 22 September 2021 10:07=0A= To: 'Wilco Dijkstra'; 'Lucas A. M. Magalhaes'; Noah Goldstein; libc-alpha@s= ourceware.org=0A= Subject: RE: [PATCH v3 2/5] benchtests: Add memset zero fill benchtest=0A= =0A= Hi Wilco,=0A= =0A= > From: Wilco Dijkstra =0A= > Sent: Tuesday, September 21, 2021 8:09 PM=0A= >=0A= > > What do you think?=0A= >=0A= > As I've mentioned, this will never work using the current benchmark loop.= =0A= > At size 256 your loop has only 1 timer tick... The only way to get any da= ta=0A= > out is to increase the time taken per call. At 16K there are about 20 tic= ks so=0A= > it is still very inaccurate. By repeating the test thousands of times you= can=0A= > some signal out (eg. 20% is 20 ticks, 80% is 21 gives ~20.8 ticks on aver= age),=0A= > but that's impossible for smaller sizes.=0A= >=0A= > So if you want to measure small sizes, you need to use a more accurate ti= ming=0A= > loop.=0A= =0A= Thank you for the comment.=0A= OK, I understood. So I updated the start size to 16KB too to commit first.= =0A= Please find V5 [1] and merge it if it's OK.=0A= Changes from V4:=0A= - Start size to 16KB from 256B=0A= - End size to 16MB from 64MB=0A= =0A= [1] https://sourceware.org/pipermail/libc-alpha/2021-September/131245.html= =0A= =0A= Thanks.=0A= Naohiro=0A= =0A=