From owner-freebsd-hackers@freebsd.org Fri Oct 23 11:46:12 2020 Return-Path: Delivered-To: freebsd-hackers@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 33606444418 for ; Fri, 23 Oct 2020 11:46:12 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4CHj9b3TYkz42Kp for ; Fri, 23 Oct 2020 11:46:11 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from tom.home (kib@localhost [127.0.0.1]) by kib.kiev.ua (8.16.1/8.16.1) with ESMTPS id 09NBjvwZ018769 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Fri, 23 Oct 2020 14:46:00 +0300 (EEST) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua 09NBjvwZ018769 Received: (from kostik@localhost) by tom.home (8.16.1/8.16.1/Submit) id 09NBjv5P018768; Fri, 23 Oct 2020 14:45:57 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Fri, 23 Oct 2020 14:45:57 +0300 From: Konstantin Belousov To: David Wolfskill , Wojciech Puchar , freebsd-hackers@freebsd.org Subject: Re: displaying total CPU usage Message-ID: <20201023114557.GX2643@kib.kiev.ua> References: <20201023112030.GF1427@albert.catwhisker.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201023112030.GF1427@albert.catwhisker.org> X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FORGED_GMAIL_RCVD,FREEMAIL_FROM, NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on tom.home X-Rspamd-Queue-Id: 4CHj9b3TYkz42Kp X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=gmail.com (policy=none); spf=softfail (mx1.freebsd.org: 2001:470:d5e7:1::1 is neither permitted nor denied by domain of kostikbel@gmail.com) smtp.mailfrom=kostikbel@gmail.com X-Spamd-Result: default: False [0.13 / 15.00]; ARC_NA(0.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; RCVD_TLS_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; FREEMAIL_FROM(0.00)[gmail.com]; NEURAL_HAM_LONG(-0.02)[-0.022]; MIME_GOOD(-0.10)[text/plain]; HAS_XAW(0.00)[]; R_SPF_SOFTFAIL(0.00)[~all:c]; NEURAL_SPAM_MEDIUM(0.09)[0.088]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_SPAM_SHORT(0.06)[0.065]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:6939, ipnet:2001:470::/32, country:US]; RCVD_COUNT_TWO(0.00)[2]; MAILMAN_DEST(0.00)[freebsd-hackers]; DMARC_POLICY_SOFTFAIL(0.10)[gmail.com : No valid SPF, No valid DKIM,none] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Oct 2020 11:46:12 -0000 On Fri, Oct 23, 2020 at 04:20:30AM -0700, David Wolfskill wrote: > On Fri, Oct 23, 2020 at 01:03:30PM +0200, Wojciech Puchar wrote: > > how to do it in batch - something like this line > > > > CPU: 0.8% user, 0.0% nice, 1.3% system, 0.0% interrupt, 97.9% idle > > > > from top but produced in non terminal/batch mode > > > > all my attempts to do it with top failed - this line is missing > > .... > > Measuring CPU usage requires sampling the per-state counters at the > beginning and at the end of an interval: it's thus done over a time > period, not an "instant." > > It's a bit of arthmetic, but you can get the counters via `sysctl > kern.cp_time` (if you want per-core, use `sysctl kern.cp_times`). > > The result is a (per-core array, in the latter case) array of counters: > system, interrupt, user, nice, and idle. > > Each difference will be the numerator; the sum of the differences will > be the denominator for each state. Multiply each fraction by 100 if you > want percentages. `vmstat 1' readily provides the measurements.