From owner-freebsd-bugs@freebsd.org Thu Feb 7 10:44:56 2019 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id BA7D414D3C43 for ; Thu, 7 Feb 2019 10:44:56 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id 4ECD382A72 for ; Thu, 7 Feb 2019 10:44:56 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 135AF14D3C42; Thu, 7 Feb 2019 10:44:56 +0000 (UTC) Delivered-To: bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id E2BC414D3C41 for ; Thu, 7 Feb 2019 10:44:55 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 7C1FF82A6C for ; Thu, 7 Feb 2019 10:44:55 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 9B4EC8ABE for ; Thu, 7 Feb 2019 10:44:54 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id x17AisAI061645 for ; Thu, 7 Feb 2019 10:44:54 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id x17AisGh061644 for bugs@FreeBSD.org; Thu, 7 Feb 2019 10:44:54 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 235556] rctl(8) pcpu/cputime is too high Date: Thu, 07 Feb 2019 10:44:54 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: olevole@olevole.ru X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Feb 2019 10:44:57 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D235556 --- Comment #2 from olevole@olevole.ru --- RACCT pcpu metrics are incorrect when processes end quickly. What i expect: maximum value for 1-core process: 100 What i get: 100x256 It is not an artificial or abstract state. For example this behavior is eas= y to see when working 'make config' for autotools with the launch of a lot of sh= ort calls (e.g env BATCH=3Dno make -C /usr/ports/misc/mc clean configure). This= makes it impossible to use any external billing based on RACCT.=20 How to reproduce ( we use cpuset here to create load on only one core. So we should have pcpu=3D100 for jail assuming the jail does nothing else ): 1) Run jail1 2) Try to execute ant fast/light external command (e.g. /bin/ls ) in the lo= op. For more convincing create a simple utility: --- #include int main() { return 0; } --- Write execution loop and drop it into jail, e.g /root/run.sh: --- #!/bin/sh while [ 1 ]; do /root/a.out > /dev/null done --- Run inside jail this script via cpuset: cpuset -c -l 0 /bin/sh /root/run.sh After this we can see on the 'top -P' something like: --- 182 processes: 2 running, 180 sleeping CPU 0: 34.1% user, 0.0% nice, 65.9% system, 0.0% interrupt, 0.0% idle CPU 1: 0.5% user, 0.0% nice, 0.0% system, 0.0% interrupt, 99.5% idle CPU 2: 3.1% user, 0.0% nice, 1.2% system, 0.0% interrupt, 95.7% idle CPU 3: 0.0% user, 0.0% nice, 0.4% system, 0.0% interrupt, 99.6% idle CPU 4: 1.2% user, 0.0% nice, 0.8% system, 0.0% interrupt, 98.1% idle CPU 5: 0.8% user, 0.0% nice, 0.4% system, 0.0% interrupt, 98.8% idle CPU 6: 1.2% user, 0.0% nice, 0.0% system, 0.0% interrupt, 98.8% idle CPU 7: 0.4% user, 0.0% nice, 0.4% system, 0.0% interrupt, 99.2% idle ... PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 41437 root 1 76 0 11408K 2232K CPU0 0 0:07 12.79% sh ... --- Only one core is busy. However if we look at the RACCT from the hoster side= , we see the following: freebsd:~ # rctl -u jail:jail1 | grep pcpu pcpu=3D25600 freebsd:~ # rctl -u jail:jail1 | grep pcpu pcpu=3D25600 freebsd:~ # rctl -u jail:jail1 | grep pcpu pcpu=3D25600 --=20 You are receiving this mail because: You are the assignee for the bug.=