Date: Tue, 27 Dec 2011 20:25:53 +0100 From: Damien Fleuriot <ml@my.gd> To: Warren Block <wblock@wonkity.com> Cc: freebsd-net@freebsd.org Subject: Re: Compiling only "network" part of the kernel Message-ID: <4EFA1BC1.5060605@my.gd> In-Reply-To: <alpine.BSF.2.00.1112271024390.36072@wonkity.com> References: <CA%2BDF=vyFTgr1PfvG0qPo9hv3VmygB9FqiqYqhKs1C26bMzJvmA@mail.gmail.com> <alpine.BSF.2.00.1112270746410.34454@wonkity.com> <4EF9E2D6.7050705@my.gd> <alpine.BSF.2.00.1112271024390.36072@wonkity.com>
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On 12/27/11 8:19 PM, Warren Block wrote: > 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. That sounds good enough. Are there any performance hits during production, as in, when not busy rebuilding the world or whatever, just normal daily operation ?help
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