Date: Wed, 3 Apr 2002 07:25:04 +0200 From: Jeroen Ruigrok/asmodai <asmodai@wxs.nl> To: Kenneth Culver <culverk@alpha.yumyumyum.org> Cc: Dag-Erling Smorgrav <des@ofug.org>, Matthew Dillon <dillon@apollo.backplane.com>, Mike Barcroft <mike@FreeBSD.ORG>, "M. Warner Losh" <imp@village.org>, jake@locore.ca, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/i386/i386 critical.c src/sys/i386/include cpufunc.h critical.h src/sys/i386/isa apic_vector.s icu_vector.s src/sys/kern kern_fork.c kern_proc.c kern_switch.c src/sys/alpha/alph Message-ID: <20020403052504.GJ78613@daemon.ninth-circle.org> In-Reply-To: <20020402163939.M47850-100000@alpha.yumyumyum.org> References: <xzplmc5u6rp.fsf@flood.ping.uio.no> <20020402163939.M47850-100000@alpha.yumyumyum.org>
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-On [20020402 23:45], Kenneth Culver (culverk@alpha.yumyumyum.org) wrote: >> Using spaces instead of tabs, especially in headers, has a noticeable >> (negative) impact on compilation speed. We could speed buildworld up >> significantly by stripping comments and superfluous whitespace from the >> headers we install in /usr/obj. > >This I didn't know, but it makes sense. It does, since the first production rule in any grammar of a language is often to match whitespace. [Since it occurs most often, placing it at the top makes a lot of sense.] The parser has to iterate 8 times instead of 1 time for a single tab character. How much gain you really get I don't know, that would need to be timed. You can always look at: http://ccache.samba.org/ to improve compilation speed. -- Jeroen Ruigrok van der Werven / asmodai / Kita no Mono asmodai@[wxs.nl|xmach.org], finger asmodai@ninth-circle.org http://www.softweyr.com/asmodai/ | http://www.[tendra|xmach].org/ Cling, cling to your mind, my Words... To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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