Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mxE7i-0007qB-TI for pgsql-hackers@arkaria.postgresql.org; Tue, 14 Dec 2021 20:10:06 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1mxE7h-0007Gb-Cu for pgsql-hackers@arkaria.postgresql.org; Tue, 14 Dec 2021 20:10:05 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mxE7h-0007GR-0P for pgsql-hackers@lists.postgresql.org; Tue, 14 Dec 2021 20:10:05 +0000 Received: from smtp-fw-6001.amazon.com ([52.95.48.154]) by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mxE7e-0001kP-J0 for pgsql-hackers@postgresql.org; Tue, 14 Dec 2021 20:10:03 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1639512602; x=1671048602; h=from:to:cc:date:message-id:references:in-reply-to: content-id:content-transfer-encoding:mime-version:subject; bh=R/PXE2zLiqKGp1Qkp2CB9KxkrOlX0UwriW7XhW82Udc=; b=Tuc6riRauZ/4fJl4O9CYly2NlEAPmiU9YJNCqy3kUNPd5OMt0FmN3p7t tp4xlIHjqxEATvCIt66BeyRX4EBECn5/1Lte/vhr7VNRgWGyMrhGLUIcU cXopqoxiXQTpKmvzKKLagweZ5P1ixmicNCflWpKh3Eo/gHOCDU2iibgqn A=; X-IronPort-AV: E=Sophos;i="5.88,206,1635206400"; d="scan'208";a="163509841" Subject: Re: O(n) tasks cause lengthy startups and checkpoints Thread-Topic: O(n) tasks cause lengthy startups and checkpoints Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-iad-1e-fc41acad.us-east-1.amazon.com) ([10.43.8.6]) by smtp-border-fw-6001.iad6.amazon.com with ESMTP; 14 Dec 2021 20:10:01 +0000 Received: from EX13MTAUWB001.ant.amazon.com (iad12-ws-svc-p26-lb9-vlan3.iad.amazon.com [10.40.163.38]) by email-inbound-relay-iad-1e-fc41acad.us-east-1.amazon.com (Postfix) with ESMTPS id 6C6E2C16C7; Tue, 14 Dec 2021 20:10:00 +0000 (UTC) Received: from EX13D03UWC003.ant.amazon.com (10.43.162.79) by EX13MTAUWB001.ant.amazon.com (10.43.161.207) with Microsoft SMTP Server (TLS) id 15.0.1497.26; Tue, 14 Dec 2021 20:09:59 +0000 Received: from EX13D03UWC004.ant.amazon.com (10.43.162.49) by EX13D03UWC003.ant.amazon.com (10.43.162.79) with Microsoft SMTP Server (TLS) id 15.0.1497.26; Tue, 14 Dec 2021 20:09:59 +0000 Received: from EX13D03UWC004.ant.amazon.com ([10.43.162.49]) by EX13D03UWC004.ant.amazon.com ([10.43.162.49]) with mapi id 15.00.1497.026; Tue, 14 Dec 2021 20:09:59 +0000 From: "Bossart, Nathan" To: Bruce Momjian CC: Robert Haas , Bharath Rupireddy , "pgsql-hackers@postgresql.org" Thread-Index: AQHX7fiXPuvo82DtDkelZW7mKoK97awwdbaA///EmgCAAKvvAP//o58AgAGyNAD//68EgA== Date: Tue, 14 Dec 2021 20:09:59 +0000 Message-ID: <803C7D41-64FD-4079-B85C-FE1E3076555C@amazon.com> References: <5E58EBB2-3DAE-4400-9EBE-60D1FE4C5B10@amazon.com> <8ACCEA4C-BA36-494B-92B4-EF14DAF1BC3B@amazon.com> <2B230EF6-7509-479C-8C5A-34B56A1B4063@amazon.com> <6DFA78EC-EF4D-4CB0-82C8-AD5DA1B8E0AC@amazon.com> <32B93472-B51D-491A-B7AF-45DD8927D981@amazon.com> <2ED889A4-8EE8-4C94-9158-38F80B661071@amazon.com> <20211214165950.GB30945@momjian.us> In-Reply-To: <20211214165950.GB30945@momjian.us> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.43.161.102] Content-Type: text/plain; charset="utf-8" Content-ID: Content-Transfer-Encoding: base64 MIME-Version: 1.0 List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk T24gMTIvMTQvMjEsIDk6MDAgQU0sICJCcnVjZSBNb21qaWFuIiA8YnJ1Y2VAbW9tamlhbi51cz4g d3JvdGU6DQo+IEhhdmUgd2UgY2hhbmdlZCB0ZW1wb3JhcnkgZmlsZSBoYW5kbGluZyBpbiBhbnkg cmVjZW50IG1ham9yIHJlbGVhc2VzLA0KPiBtZWFuaW5nIGlzIHRoaXMgYSBjdXJyZW50IHByb2Js ZW0gb3Igb25lIGFscmVhZHkgaW1wcm92ZWQgaW4gUEcgMTQuDQoNCkkgaGF2ZW4ndCBub3RpY2Vk IGFueSByZWNlbnQgaW1wcm92ZW1lbnRzIHdoaWxlIHdvcmtpbmcgaW4gdGhpcyBhcmVhLg0KDQpO YXRoYW4NCg0K