From owner-freebsd-net@FreeBSD.ORG Tue Dec 27 19:19:14 2011 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id F2D3D106566C for ; Tue, 27 Dec 2011 19:19:14 +0000 (UTC) (envelope-from wblock@wonkity.com) Received: from wonkity.com (wonkity.com [67.158.26.137]) by mx1.freebsd.org (Postfix) with ESMTP id B1E568FC19 for ; Tue, 27 Dec 2011 19:19:14 +0000 (UTC) Received: from wonkity.com (localhost [127.0.0.1]) by wonkity.com (8.14.5/8.14.5) with ESMTP id pBRJJDKj036816; Tue, 27 Dec 2011 12:19:13 -0700 (MST) (envelope-from wblock@wonkity.com) Received: from localhost (wblock@localhost) by wonkity.com (8.14.5/8.14.5/Submit) with ESMTP id pBRJJDLh036813; Tue, 27 Dec 2011 12:19:13 -0700 (MST) (envelope-from wblock@wonkity.com) Date: Tue, 27 Dec 2011 12:19:13 -0700 (MST) From: Warren Block To: Damien Fleuriot In-Reply-To: <4EF9E2D6.7050705@my.gd> Message-ID: References: <4EF9E2D6.7050705@my.gd> User-Agent: Alpine 2.00 (BSF 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (wonkity.com [127.0.0.1]); Tue, 27 Dec 2011 12:19:13 -0700 (MST) Cc: freebsd-net@freebsd.org Subject: Re: Compiling only "network" part of the kernel X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Dec 2011 19:19:15 -0000 On Tue, 27 Dec 2011, Damien Fleuriot wrote: > On 12/27/11 3:51 PM, Warren Block wrote: >> On Tue, 27 Dec 2011, Rajneesh Kumar wrote: >> >>> During my development, I want to check if my modules compile successfully >>> or not. I am only changing the ARP portion and whenever I compile my >>> kernel, it takes around 20mins and compiles all different modules also. >>> I just want to compile and check whether my ARP modules, which I have >>> changed, compile fine or not. How to do it? >> >> Others have mentioned ways to reduce what is rebuilt. devel/ccache can >> be used in combination with those. Even by itself it ought to seriously >> reduce kernel compile time. > > Would ccache also help with world/ports compile times ? Yes, if some of it is already in the cache. Ports change relatively rarely, so I don't use ccache for them. > Are there any drawbacks to using it ? (the underlying question being: is > it worthy of a production environment ?) It needs cache space and probably slows things down a bit when code is not already in the cache. Some source updates invalidate a lot of the cache. But no other problems I've noticed. Times for 8-STABLE on an E8400 CPU, everything in the cache. make -j4 buildworld: Normal 19:41 ccache 6:02 make -j4 buildkernel (custom kernel): Normal 8:43 ccache 2:47 Those are best-case times. A typical ccache buildworld after csup to -stable is about 9 minutes on this system.