From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 119839 invoked by alias); 27 Nov 2019 19:38:12 -0000 Mailing-List: contact overseers-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: , Sender: overseers-owner@sourceware.org Received: (qmail 119831 invoked by uid 89); 27 Nov 2019 19:38:12 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-3.3 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=3.3.1 spammy=eat, consumption, letting, elapsed X-HELO: us-smtp-1.mimecast.com Received: from us-smtp-delivery-1.mimecast.com (HELO us-smtp-1.mimecast.com) (207.211.31.120) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Wed, 27 Nov 2019 19:38:11 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574883489; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=je/6VIJA/mJ076P9Wg4tsqLm7bMCsICRD8WiznnXjAk=; b=I2cPaRZPKlf1DOEzx2k+ZNETnmi0UHoewRKp/nmbz1XJ8pHFDXdSRN2cDTPq4km+u52dmy 8JZXy71r7jojNLyCpv9Cnk9rxKRHeEJ97ESzd2lnhAal21IyPYn2ppDodCLrkwam6CFs+I eiMZfFgOoWJHcGrp18F+tIJs5MVlrlY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-341-Wa1zpsk8N-mK-JOoNLeoeg-1; Wed, 27 Nov 2019 14:38:08 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B479E18A07C3; Wed, 27 Nov 2019 19:38:06 +0000 (UTC) Received: from redhat.com (ovpn-116-64.phx2.redhat.com [10.3.116.64]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 85C365C219; Wed, 27 Nov 2019 19:38:06 +0000 (UTC) Received: from fche by redhat.com with local (Exim 4.92) (envelope-from ) id 1ia38W-0000qf-Oc; Wed, 27 Nov 2019 14:38:04 -0500 Date: Wed, 27 Nov 2019 19:38:00 -0000 From: "Frank Ch. Eigler" To: ASSI Cc: "Frank Ch. Eigler" , Jon Turney , overseers@sourceware.org Subject: Re: [Cygwin] package-grep on Sourceware Message-ID: <20191127193804.GB1967@redhat.com> References: <24997709.IERGFR1AUN@gertrud> <20191125003701.GB1093554@elastic.org> <1810471.5kLSPG0ym2@gertrud> MIME-Version: 1.0 In-Reply-To: <1810471.5kLSPG0ym2@gertrud> User-Agent: Mutt/1.12.0 (2019-05-25) X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-IsSubscribed: yes X-SW-Source: 2019-q4/txt/msg00049.txt.bz2 Hi - > [...] I would like to understand what characteristic of the workload > you were trying to avoid as to me it looks like avoiding IO comes at > a significant cost in either memory or CPU consumption (or both). > [...] CPU elapsed time primarily. I restored the previous package-grep.cgi, with the xargs parallelization speedup. We'll just have to eat the I/O cost (or rather, letting hundreds of megabytes squat the page cache in RAM). A malevolent enough grep regex could still take a long time (produce many hits), but less bad than before. - FChE