From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C91E5C4321A for ; Tue, 11 Jun 2019 19:28:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9BF6220644 for ; Tue, 11 Jun 2019 19:28:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=networkplumber-org.20150623.gappssmtp.com header.i=@networkplumber-org.20150623.gappssmtp.com header.b="rYoG/cbP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404969AbfFKT2I (ORCPT ); Tue, 11 Jun 2019 15:28:08 -0400 Received: from mail-pg1-f195.google.com ([209.85.215.195]:34636 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404335AbfFKT2I (ORCPT ); Tue, 11 Jun 2019 15:28:08 -0400 Received: by mail-pg1-f195.google.com with SMTP id p10so1662691pgn.1 for ; Tue, 11 Jun 2019 12:28:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=3Gqu7ufAp/RSuYdkQrxRWcURv0D9D3LGELTCgEHasOY=; b=rYoG/cbPEy8f922Zw2P3KHMRMS5yBgEZnp+ggFiq3VXUwKpnHtoTF7uygPLMgQrldF Yi9DFbmB3G8q5Rq2Ioo5FEjc6YZm9F8Knk8NRiS+trndCvcRZUieQV3CeHLry7LK+d/e Vs7q0b6unQJKCDbG7OnJAY1/StiUAv3zeW5U2LnQU027Tp0YDX1D4V9ECyAavHN5GTYx Lhx1L/pEm8NFjPLPoL81ZgNuIc4ZIs5s+0iaRHeKHCNnlIDeay7MVirz1EcYi7x/xOb4 PCPhUU4eLvSyfFNv9/Vedc/cDIwpBkhjPsH3AKlXfwwhgXNjDf7zPMJDEjIrxzOGNekh nTVQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=3Gqu7ufAp/RSuYdkQrxRWcURv0D9D3LGELTCgEHasOY=; b=qqqFFnTrzPXivgrjVHzCTQkgWd5FHbD8ao5vvE5mT3k0S0zm3iUzKtNNZ6wQAUC8Oc 6kt+6V80mzQ9z+RK0Vgf/qrcJ4ZdDmSOPFIhLJ0ODKUMKoIJLUQRGsPKhNkq7gbUEi29 y7BmZq0+HVXkVhSXgXA4rUS15rVHyjQuBryINr+3faWNvqwmUR2h7LOCmN0I9O1WDGHt aCn+DyoZSzzIei4i6dN66q6OsDfPz1YJ21eMG1n8RMLEY9dRwD575ln38oBMbIZ41Vvp 820miNTkER+1EACsnv5etyOOd9ujb7JiRDeMRV/yC0nhud5WhAwSgfqSIJKyqPZGHE2b OJIQ== X-Gm-Message-State: APjAAAVt9vKLZPU5rD96GDTkKrxOd3XD4i9i5Xk8+xzimENVnRYcAfbo 6w2QwrrUd7f9M+/B8NULWA+P4urgONc= X-Google-Smtp-Source: APXvYqzOVT/RDZeOh/aRanWtVrERe9LqZidcHpQeu3BDxcEjTnk3BKnUgqsQEuD+eVgEJT6VArDx7w== X-Received: by 2002:a63:8dc4:: with SMTP id z187mr21888215pgd.337.1560281287403; Tue, 11 Jun 2019 12:28:07 -0700 (PDT) Received: from hermes.lan (204-195-22-127.wavecable.com. [204.195.22.127]) by smtp.gmail.com with ESMTPSA id s1sm3498255pfm.187.2019.06.11.12.28.06 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 11 Jun 2019 12:28:07 -0700 (PDT) Date: Tue, 11 Jun 2019 12:28:00 -0700 From: Stephen Hemminger To: Matteo Croce Cc: netdev@vger.kernel.org, David Ahern Subject: Re: [PATCH iproute2-next] Makefile: pass -pipe to the compiler Message-ID: <20190611122800.56d72eba@hermes.lan> In-Reply-To: <20190611180513.30772-1-mcroce@redhat.com> References: <20190611180513.30772-1-mcroce@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Tue, 11 Jun 2019 20:05:13 +0200 Matteo Croce wrote: > Pass the -pipe option to GCC, to use pipes instead of temp files. > On a slow AMD G-T40E CPU we get a non negligible 6% improvement > in build time. > > real 1m15,111s > user 1m2,521s > sys 0m12,465s > > real 1m10,861s > user 1m2,520s > sys 0m12,901s > > Signed-off-by: Matteo Croce Why bother, on my machine (make -j12). Before real 0m6.320s user 0m30.674s sys 0m3.649s After (with -pipe) real 0m6.158s user 0m31.197s sys 0m3.532s So it is slower. Get a faster disk :-) Maybe allow "EXTRA_CFLAGS" to be passed to Makefile for those that have a burning need for this.