Received: from malur.postgresql.org ([2a02:16a8:dc51::56]) by arkaria.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1fyLNB-0002QQ-6E for pgsql-performance@arkaria.postgresql.org; Fri, 07 Sep 2018 18:20:49 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.89) (envelope-from ) id 1fyLN9-0001fI-K1 for pgsql-performance@arkaria.postgresql.org; Fri, 07 Sep 2018 18:20:47 +0000 Received: from makus.postgresql.org ([2001:4800:1501:1::229]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1fyLN9-0001eu-98 for pgsql-performance@lists.postgresql.org; Fri, 07 Sep 2018 18:20:47 +0000 Received: from mail.i-mark.de ([188.138.104.222]) by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1fyLF1-0001A2-Vc for pgsql-performance@lists.postgresql.org; Fri, 07 Sep 2018 18:12:26 +0000 Received: from OnePlus3.fritz.box (unknown [185.38.49.16]) by mail.i-mark.de (Postfix) with ESMTPSA id 18D0C1580702; Fri, 7 Sep 2018 20:12:16 +0200 (CEST) Authentication-Results: loft7616.startdedicated.de; spf=pass (sender IP is 185.38.49.16) smtp.mailfrom=andreas@a-kretschmer.de smtp.helo=OnePlus3.fritz.box Received-SPF: pass (loft7616.startdedicated.de: connection is authenticated) Date: Fri, 07 Sep 2018 20:12:18 +0200 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: Multi-second pauses blocking even trivial activity To: pgsql-performance@lists.postgresql.org,Patrick Molgaard From: Andreas Kretschmer Message-ID: List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk > >Intermittently (one or two times a week), all queries on that host are >simultaneously blocked for extended periods (10s of seconds)=2E > >The blocked queries are trivial & not related to locking - I'm seeing >slowlogs of the form: > please check if THP are enabled=2E Regards, Andreas --=20 2ndQuadrant - The PostgreSQL Support Company