Date: Tue, 15 Nov 2005 16:42:18 -0800
From: Maxim Sobolev <sobomax@portaone.com>
To: michael johnson <buhnux@gmail.com>
Cc: Steve Hodgson <steve@acidy.com>, Constantin d'Ribin <cat@portaone.com>, Nicolas Blais <nb_root@videotron.ca>, freebsd-current@freebsd.org, Jens Schweikhardt <schweikh@schweikhardt.net>
Subject: Re: Using ccache for build{world, kernel}
Message-ID: <437A806A.9090502@portaone.com>
In-Reply-To: <3DE7B806-FB6B-4388-8FC7-E495F82E9D9B@ahze.net>
References: <200511141702.45491.nb_root@videotron.ca> <200511150542.34910.nb_root@videotron.ca> <4379BCEB.6030806@acidy.com> <200511150611.31743.nb_root@videotron.ca> <20051115183647.GA1783@schweikhardt.net> <20051115211418.GE1783@schweikhardt.net> <437A780C.8070609@portaone.com> <3DE7B806-FB6B-4388-8FC7-E495F82E9D9B@ahze.net>
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michael johnson wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > On Nov 15, 2005, at 7:06 PM, Maxim Sobolev wrote: > >> I have better patch which extends detection mechanism, so that along >> with size/mtime checksum of the compiler binary is stored as well. >> Since compiler binary linked from the same sources/objects will have >> the same checksum it allows ccache to be used OOB with buildworld. Do >> you have any interest in putting it into the port? >> >> http://www.portaone.com/~sobomax/ccache.buildworld >> > > Sure, I just have one question about the way this thing works. Would > using this patch not > make collision probability of the cache higher? I don't think this > would be a huge problem, > but it's not impossible to do with a 1,000,000~ file cache now. I am not a cryptoanalyst but I don't think it can have any measureable effect on collision probability. -Maxim
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