From users-return-268768-archive-asf-public=cust-asf.ponee.io@tomcat.apache.org Mon Nov 18 19:28:33 2019 Return-Path: X-Original-To: archive-asf-public@cust-asf.ponee.io Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [207.244.88.153]) by mx-eu-01.ponee.io (Postfix) with SMTP id 102BE180657 for ; Mon, 18 Nov 2019 20:28:32 +0100 (CET) Received: (qmail 3647 invoked by uid 500); 18 Nov 2019 19:28:29 -0000 Mailing-List: contact users-help@tomcat.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: "Tomcat Users List" Delivered-To: mailing list users@tomcat.apache.org Received: (qmail 3636 invoked by uid 99); 18 Nov 2019 19:28:29 -0000 Received: from Unknown (HELO mailrelay1-lw-us.apache.org) (10.10.3.42) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 18 Nov 2019 19:28:29 +0000 Received: from [192.168.23.12] (host213-121-9-136.range213-121.btcentralplus.com [213.121.9.136]) by mailrelay1-lw-us.apache.org (ASF Mail Server at mailrelay1-lw-us.apache.org) with ESMTPSA id C8AEE4FB4 for ; Mon, 18 Nov 2019 19:28:28 +0000 (UTC) Subject: Re: tomcat thread incurring CPU load To: users@tomcat.apache.org References: <0F7034A9-A36D-4782-A3EC-48F58F4A5B72@apache.org> <57d65705-9eef-5644-4e12-a949eec57871@apache.org> <2b5ae4f0-95d3-33f9-121c-cdb4690ab959@christopherschultz.net> <9ac5a1a9-025e-f9e3-59a5-62ec9bcf142b@apache.org> <254aae5f-5d41-b8a6-73d0-43144d0e8350@apache.org> From: Mark Thomas Openpgp: preference=signencrypt Autocrypt: addr=markt@apache.org; prefer-encrypt=mutual; keydata= mQINBEq0DukBEAD4jovHOPJDxoD+JnO1Go2kiwpgRULasGlrVKuSUdP6wzcaqWmXpqtOJKKw W2MQFQLmg7nQ9RjJwy3QCbKNDJQA/bwbQT1F7WzTCz2S6vxC4zxKck4t6RZBq2dJsYKF0CEh 6ZfY4dmKvhq+3istSoFRdHYoOPGWZpuRDqfZPdGm/m335/6KGH59oysn1NE7a2a+kZzjBSEg v23+l4Z1Rg7+fpz1JcdHSdC2Z+ZRxML25eVatRVz4yvDOZItqDURP24zWOodxgboldV6Y88C 3v/7KRR+1vklzkuA2FqF8Q4r/2f0su7MUVviQcy29y/RlLSDTTYoVlCZ1ni14qFU7Hpw43KJ tgXmcUwq31T1+SlXdYjNJ1aFkUi8BjCHDcSgE/IReKUanjHzm4XSymKDTeqqzidi4k6PDD4j yHb8k8vxi6qT6Udnlcfo5NBkkUT1TauhEy8ktHhbl9k60BvvMBP9l6cURiJg1WS77egI4P/8 2oPbzzFiGFqXyJKULVgxtdQ3JikCpodp3f1fh6PlYZwkW4xCJLJucJ5MiQp07HAkMVW5w+k8 Xvuk4i5quh3N+2kzKHOOiQCDmN0sz0XjOE+7XBvM1lvz3+UarLfgSVmW8aheLd7eaIl5ItBk 8844ZJ60LrQ+JiIqvqJemxyIM6epoZvY5a3ZshZpcLilC5hW8QARAQABtCJNYXJrIEUgRCBU aG9tYXMgPG1hcmt0QGFwYWNoZS5vcmc+iQI3BBMBCgAhBQJKtA7pAhsDBQsJCAcDBRUKCQgL BRYCAwEAAh4BAheAAAoJEBDAHFovYFnn2YgQAKN6FLG/I1Ij3PUlC/XNlhasQxPeE3w2Ovtt weOQPYkblJ9nHtGH5pNqG2/qoGShlpI04jJy9GxWKOo7NV4v7M0mbVlCXVgjdlvMFWdL7lno cggwJAFejQcYlVtxyhu4m50LBvBunEhxCbQcKnnWmkB7Ocm0Ictaqjc9rCc1F/aNhVMUpJ0z G1kyTp9hxvN6TbCQlacMx5ocTWzL0zn6QZhbUfrYwfxYJmSnkVYZOYzXIXIsLN5sJ9Q4P8tj Y4qWgd+bQvOqPWrkzL9LVRnGOrSYIsoM5zWdoj1g1glMzK/ZqJdRqqqBhe6FYTbXipz8oX8i mCebcaxZnfLhGiqqX+yDa3YUwDiqom+sZOc0iXGvKkqltPLpNeF0MVT7aZjalsQ/v2Ysb24R Ql9FfjfWmvT8ZPWz8Kore1AI4UcIIgFVtM+zuLlL9CIsGjg+gHDE2dhZDY0qfizlHL9CoAWU DM3pIfxM2V4BRn1xO+j/mModhjmYLZvnFVz4KGkNO7wRkofAANIWYo3WI5x83BGDH371t3NR rrpSSFP0XpQX6/Leaj2j6U6puABL2qBxhscsO6chc3u4/+019ff+peZVsc9ttcTQXsKIujmM b8p2sk5usmv6PKVX3oW/RAxpbVHU5kZ5px1Hq7mMQdZfLs5ff4YymXBH02z4/RmSzPam0Xb5 uQINBEq0DukBEADCNEkws5YroBmbu8789Xf006gTl5LzD/Hdt3sAp9iCfPgucO+l7U+xbo1X HTMJQwEVfS+Rx3RbaLYRG+hU7FuJLQB/5NaCDNRuqw5KHyQtJUH+zo84IqqfMzG8aOSdHg1y r2xKH4QTmgQONBu/W0xEZmZro6TjYNwkk2pwXK2yuImZPUOy+mK1qF8Wm3hTtkPE+FFSNFIa eHDoTGmx/0Riu/K7dNJTrC0TlRpn2K6d60zB53YYTc+0DYSDyB0FupXiAx/+XEGn3Q7eNi2B V6w50v5r51QP8zptiFflMfFKNAfV8xS5MteQd98YS5qqd/LPo3gS5HFPQaSL0k3RTClv7fQN HcZFqmv0OWpix6zm2npYxhqsTDGeSa52/uXehVXF5JubYFifMSLpbGVZqdrmG5hr2cycxsjF iY0zJOaRitmN/JWbOGLiwrcN4ukKNyFntFG5jPaFnJdx9rHfyJNeF9cgv9JlZeFxJ6WqIAhl KOuH3K8/py0SPE6ZOFfRo0YUxvh25K/siOcPLm613aOxyY7YfQ8ME2vgn7I0mAtg9am+YFDa bGqj839odwZdzZv2T2mUHnybFTJFBuMWGWKYstYDS6eZEmhupbPvUKkDug/mO+gdo+pSKF9Y S6DM5RtCdTNJq4NZY50ypBb5RSj+INHPocIp2V/DDTbzySsu6wARAQABiQIfBBgBCgAJBQJK tA7pAhsMAAoJEBDAHFovYFnnLe0P/i34oK5cE2LlqUEITEcTO94x1EX0UmtKokRfQ3AYWK8X eFD8cmSty72hMkL+1c0V//4Qc53SUyLIWXk8FKWF7hdL3zyuBqlRb55721CYC35GA/jR90p0 k1vr701gaat2cNTOVC0/6H9cE5yYXT+zMr9TSiKCDwONhhSbmAJZc6X0fgsmCD7I5xUI5Vri hN/Wx0CZBtrXGUyE4hgFaYSGptZmkY5Ln1e+nI185Bda7bpLwcAIGrI9nYtVXgf71ybGKdPP tFfXIoPXuctn99M7NnWBhNuGDms2YWkOC7eeWBTxKkZDWR3vRmRy52B6GxR7USk/KXs7yqGP kfT/c4CZFfOurZUXXuC3PvOme0DQmqwExtJormoG4Fy6suEFPrfhYMigTy7kSbVTCOBMjQLH +U/FFNshvg9+M/ZvaKT+0lpRvBSuG5ngsC0bO0xWsXhb6qfH2h53g4VcwFvCBL5IfqgAeUbC nGGHNcGWpmwdeb7D7ahrNZSHEUUYR7lTbjkYS01/QDOcEwNZOqDRIJUQOOUq35721VeROkdh ZmMZtFlsQeQJsWoqGrQo/kEYicVlMVOgjmOOzOa5fRb/IqlGlBn4a4me3hWthLLtMy+OOEim 6ENjntVTBQiTP/YqrxWDbCkaD7b2e9wY5N3JlRxMIQHfcHaND3PRdQSn7oHYXmJl Message-ID: <99cb4a52-96ad-43ac-6d38-f82414acbb32@apache.org> Date: Mon, 18 Nov 2019 19:28:27 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <254aae5f-5d41-b8a6-73d0-43144d0e8350@apache.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit On 18/11/2019 14:14, Mark Thomas wrote: > On 18/11/2019 12:06, M. Manna wrote: >> Mark and others, >> >> On Mon, 18 Nov 2019 at 12:01, Mark Thomas wrote: >> >>> OK, it looks like I can reproduce this. >>> >>> Steps to reproduce: >>> >>> - Windows 2016 Server fully patched >>> - Java 1.8.0u144 >>> - Install Tomcat 8.5.45 from windows installer >>> - Add tcnative-1.dll (64-bit) from Tomcat Native 1.2.23 >>> - Modify server.xml to use Http11AprProtocol on port 8080 >>> - Make a single request >>> >>> I then see 1 core running at 100% until the connection times out after >>> 20s. Make another request and a core goes back up to 100% for 20s (the >>> default keep-alive time out). >>> >> >> I have also successfully reproduced this with making a single request >> (sorry for not replying in the weekend). Not sure how your graph looked >> like, but the Jvisualvm showed me a Sinusoidal modulation curve as soon as >> the request hit the server. and it didn't go down at all. > > I see similar behaviour on Windows 7 but the the CPU usage drops after ~5s. > > A binary search indicates that the issue was introduced with this commit: > > https://github.com/apache/tomcat/commit/fffb08790e642e03f00c5f96a3a61ee09a2c8342 > > (this is for 9.0.x - 8.5.x and 7.0.x had similar commits) > > However, that code was removed when APR was switched to a single poll > set. Ah ha. It was removed in 9.0.x but not in 8.5.x (only 9.0.x switched to a single Poller) so it does look like this change is responsible. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org For additional commands, e-mail: users-help@tomcat.apache.org