From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from esa2.fujitsucc.c3s2.iphmx.com (esa2.fujitsucc.c3s2.iphmx.com [68.232.152.246]) by sourceware.org (Postfix) with ESMTPS id 222263858C27 for ; Wed, 22 Sep 2021 01:07:54 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 222263858C27 X-IronPort-AV: E=McAfee;i="6200,9189,10114"; a="47785069" X-IronPort-AV: E=Sophos;i="5.85,312,1624287600"; d="scan'208";a="47785069" Received: from mail-os2jpn01lp2059.outbound.protection.outlook.com (HELO JPN01-OS2-obe.outbound.protection.outlook.com) ([104.47.92.59]) by ob1.fujitsucc.c3s2.iphmx.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2021 10:07:52 +0900 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=lmCRLj5TmnNZ1qMk49yVUGrbkEi1vG3xfpuqdc48erP4Mr8tCYeF1WtJ98Cw0smnZs5xk4SeQMj4+KJlDjFSTmgqXDNNY8K4FYi3wvxvSY71onXFdaOFU+MG3dxvmv2T4Hh14MoIbXBdj3RfBbUxTaQ2Rjk/ri/onH4H3Kh9fiGeoCoAzxJEtgbuT6vwZkL9m0T4soI3KOS+8lkK2d4wm/ywYVerB6k4Othy49rGuKVXLy+hAVRFG04shaCLME2ooBFkIrii2p5mLl1rQwXzI8ENbUMxMN5eoCuSoExMraoGbJudfux5jZ3USfKzY5qqYPCV+0QWqXESpq3rc5nDCA== 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=C+MOXM5Vb5kAjSM5mAYG8byIlXEorHLtVc6qV/jx+1Q=; b=D8d7DjlLlhmV57lQepfWNZaowEYLJqI37feWQEXW/VZ/EZyMLXzI5aFnydWqRuXpip5f47SLtLTpJTcvJLjNlsO2AoWLbTz9uAwqXgzarHyM3R6F92ptZY75m0XJ2s0acQlWFz0I5gmm2FtAspqNVtAJGVvVnMSegv4h7PQDJOsAQx67YzDHlUtcfSo7RX7TqvKHjebL0V4ALqm/w54gvbMQHRJkt9YpfugY12c3fWyDNYuGdUUQ1Z17EiNoyj4x87n9jfQzFB1K1YQHV1KLSAbNZrBVMDHKzyVAIYQyfp8Uzo3CaGnAvJJrAlIHIuP03MZ/kGRs7HYYsKyW7iK1vA== 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 TYYPR01MB6828.jpnprd01.prod.outlook.com (2603:1096:400:d3::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4523.18; Wed, 22 Sep 2021 01:07:48 +0000 Received: from TYAPR01MB6025.jpnprd01.prod.outlook.com ([fe80::253b:6b27:fc5c:204e]) by TYAPR01MB6025.jpnprd01.prod.outlook.com ([fe80::253b:6b27:fc5c:204e%5]) with mapi id 15.20.4523.018; Wed, 22 Sep 2021 01:07:48 +0000 From: "naohirot@fujitsu.com" To: 'Wilco Dijkstra' , "'Lucas A. M. Magalhaes'" , Noah Goldstein , "libc-alpha@sourceware.org" 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/AgACj7YCAAN1nMA== Date: Wed, 22 Sep 2021 01:07:48 +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: ja-JP X-MS-Has-Attach: X-MS-TNEF-Correlator: x-securitypolicycheck: OK by SHieldMailChecker v2.6.3 x-shieldmailcheckermailid: 850a619c4ddd44d998817947c4f9bf04 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=2021-09-15T08:24:55.298Z; 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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: c180fd81-4403-4ac5-47fb-08d97d6564bc X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Sep 2021 01:07:48.3710 (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: 4hr83zRLX54ULm3BX6n82BAlN0/q+EEtGRrnqSd6IrRi8dpunkAfiX/UnUuIye40A4nkzsPpwl27ommtscjfDw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYYPR01MB6828 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: Wed, 22 Sep 2021 01:07:55 -0000 Hi Wilco, > From: Wilco Dijkstra > Sent: Tuesday, September 21, 2021 8:09 PM > > > What do you think? >=20 > As I've mentioned, this will never work using the current benchmark loop. > At size 256 your loop has only 1 timer tick... The only way to get any da= ta > out is to increase the time taken per call. At 16K there are about 20 tic= ks so > it is still very inaccurate. By repeating the test thousands of times you= can > some signal out (eg. 20% is 20 ticks, 80% is 21 gives ~20.8 ticks on aver= age), > but that's impossible for smaller sizes. >=20 > So if you want to measure small sizes, you need to use a more accurate ti= ming > loop. Thank you for the comment. OK, I understood. So I updated the start size to 16KB too to commit first. Please find V5 [1] and merge it if it's OK. Changes from V4: - Start size to 16KB from 256B - End size to 16MB from 64MB [1] https://sourceware.org/pipermail/libc-alpha/2021-September/131245.html Thanks. Naohiro