X-Recipient: archive-cygwin AT delorie DOT com DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:subject:content-type :content-transfer-encoding:in-reply-to:references:date :message-id:mime-version; q=dns; s=default; b=Ppk/IHyMxhbRYD2q0b k/wTPIpPbAFfYe56h554a0+KlXJi8udyyaAXfwde7nxRDJlEUvhXjDWKQkb2QDf5 IFZ/qV4S+95lAR945YbiTtEHPzoj+QtC1qZzqi8Q3GAhXBrYXb48HEOC6ysuumW0 xdBguJdiwmPv/2aGP3+6UusY4= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:from:to:subject:content-type :content-transfer-encoding:in-reply-to:references:date :message-id:mime-version; s=default; bh=3Dq05hr3SoGQHayvceRXUnNn N7Y=; b=lbzQvdZMMoMyrX9Dt5Nq7mtLdkwPVa99sp2C+YoA/V6Nu7oasUEeUH2m figNEcGszo0nOPRBPPa2Xp8E2nkuUC4jAvzlqdwNkGW/iHL1qrh7ymet24Gihb3b U9lQ/ptOgFgs8dlzqye4/6QZUoxnE++thsQwuk+cajTpFe14NVI= Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=0.0 required=5.0 tests=AWL,BAYES_00,RCVD_IN_BL_SPAMCOP_NET,RCVD_IN_DNSWL_NONE,RP_MATCHES_RCVD,SPF_PASS autolearn=no version=3.3.2 X-HELO: mailout.ish.de From: Helmut Karlowski To: cygwin AT cygwin DOT com Subject: Re: Bash / cygwin process spawning (?) performance very slow Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In-Reply-To: <5602C4AD.2060609@null.net> References: <5602C4AD DOT 2060609 AT null DOT net> Date: Wed, 23 Sep 2015 18:55:28 +0200 Message-Id: <20150923185528.6E9C1A00.helmut.karlowski@ish.de> MIME-Version: 1.0 X-IsSubscribed: yes --------------------------------------------------- > I'm not running any antivirus as far as I'm aware of (I do run a Comodo firewall with all "virus" scanning disabled). > I checked again, and it really is the Bash.exe which is consuming a lot of Kernel time. I didn't spot another process kicking in and consuming cycles. You can do the same in dash (sans time) for example to rule out bash. > Any idea how to diagnose the cause of this? Is there any Cygwin specific logging/tracing to see where it is happening? Maybe: strace bash -c 'time cat some-file | while read i;do echo $i;/bin/true;done' Haven't tested it. Simplify the command: for((i=0;i<150;i++));do /bin/true;done to rule out a pipe-problem. -Helmut -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple