Date: Fri, 20 Aug 2010 21:27:44 +0200 From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no> To: Alan Cox <alc@cs.rice.edu> Cc: alc@freebsd.org, Dimitry Andric <dimitry@andric.com>, current@freebsd.org Subject: Re: Official request: Please make GNU grep the default Message-ID: <8639u9f5jj.fsf@ds4.des.no> In-Reply-To: <4C6D5302.4030602@cs.rice.edu> (Alan Cox's message of "Thu, 19 Aug 2010 10:51:30 -0500") References: <4C6505A4.9060203@FreeBSD.org> <20100813085235.GA16268@freebsd.org> <4C66C010.3040308@FreeBSD.org> <4C673F02.8000805@FreeBSD.org> <20100815013438.GA8958@troutmask.apl.washington.edu> <4C67492C.5020206@FreeBSD.org> <B7A05068-9578-4341-851B-86BD9BC7A2DA@gmail.com> <8639ufd78w.fsf@ds4.des.no> <4C6844D8.5070602@andric.com> <86sk2faqdl.fsf@ds4.des.no> <4C6AAA88.5080606@andric.com> <AANLkTik-ee6iKiOoA=KMmmToS2giUOmW5JB-d1vBx9r3@mail.gmail.com> <4C6AF13A.1080606@andric.com> <AANLkTikCyVVmx3-f4g2x1a%2Bq6PYOCLA-KrF53NFTx7uQ@mail.gmail.com> <4C6D3BBB.7030104@andric.com> <4C6D5302.4030602@cs.rice.edu>
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Alan Cox <alc@cs.rice.edu> writes: > Here is what actually puzzles me about these results. With > traditional I/O, even after the optimizations to bsdgrep, the system > time for gnugrep is still less than half that of the optimized > bsdgrep. I haven't looked at the changes, but I would have thought > the system time for gnugrep and bsdgrep would be almost the same. Two reasons: 1) BSD grep does tons of unnecessary memory-to-memory copy operations in grep_fgetln(). 2) GNU grep has its own highly optimized regex code. DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no
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