Date: Thu, 4 Apr 2002 12:08:05 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Dag-Erling Smorgrav <des@ofug.org> Cc: Kenneth Culver <culverk@alpha.yumyumyum.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: style(9) bike shed, 371st edition (was: 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: <20020404120805.U44513@wantadilla.lemis.com> In-Reply-To: <xzp7knoq591.fsf@flood.ping.uio.no> References: <20020402154308.F46914-100000@alpha.yumyumyum.org> <xzplmc5u6rp.fsf@flood.ping.uio.no> <20020403100131.Q26122@wantadilla.lemis.com> <xzp7knoq591.fsf@flood.ping.uio.no>
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On Wednesday, 3 April 2002 at 15:30:18 +0200, Dag-Erling Smorgrav wrote: > Greg 'groggy' Lehey <grog@FreeBSD.org> writes: >> On Tuesday, 2 April 2002 at 23:31:38 +0200, Dag-Erling Smorgrav wrote: >>> Using spaces instead of tabs, especially in headers, has a noticeable >>> (negative) impact on compilation speed. >> Do you have figures? > > No. I benchmarked this a long time ago on C++ sources using Sun's > compiler suite; the difference was noticeable but the sample was > small. Once upon a time, the lexical analysis really did take up a significant part of the compiler's time. But nowadays faster processors make it easier to use more time-consuming code generation algorithms, and I suspect that lexical analysis falls into the noise anyway. It would be interesting if somebody would examine it. On a similar note, Andrew Tridgell has written a compiler cache which claims to be able to speed up things by recognizing already-compiled sources. I'm a little sceptical myself, but everybody who has tried it says it's very useful. http://ccache.samba.org/ for more details. Greg -- See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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