From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.180.0/23 X-Spam-Status: No, score=-4.8 required=3.0 tests=AWL,BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_HI,RP_MATCHES_RCVD shortcircuit=no autolearn=ham autolearn_force=no version=3.4.0 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by dcvr.yhbt.net (Postfix) with ESMTP id AB912202A0 for ; Thu, 26 Oct 2017 15:08:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932434AbdJZPIR (ORCPT ); Thu, 26 Oct 2017 11:08:17 -0400 Received: from smtprelay0238.hostedemail.com ([216.40.44.238]:40149 "EHLO smtprelay.hostedemail.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932366AbdJZPIQ (ORCPT ); Thu, 26 Oct 2017 11:08:16 -0400 X-Greylist: delayed 313 seconds by postgrey-1.27 at vger.kernel.org; Thu, 26 Oct 2017 11:08:16 EDT Received: from smtprelay.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by smtpgrave08.hostedemail.com (Postfix) with ESMTP id 87517182D5422 for ; Thu, 26 Oct 2017 15:03:02 +0000 (UTC) Received: from filter.hostedemail.com (clb03-v110.bra.tucows.net [216.40.38.60]) by smtprelay05.hostedemail.com (Postfix) with ESMTP id C55E01802EB28 for ; Thu, 26 Oct 2017 15:03:01 +0000 (UTC) X-Session-Marker: 6A6F6540706572636865732E636F6D X-HE-Tag: ring06_191f87e8fe903 X-Filterd-Recvd-Size: 892 Received: from XPS-9350 (unknown [47.151.150.235]) (Authenticated sender: joe@perches.com) by omf12.hostedemail.com (Postfix) with ESMTPA for ; Thu, 26 Oct 2017 15:02:52 +0000 (UTC) Message-ID: <1509030170.10651.59.camel@perches.com> Subject: grep vs git grep performance? From: Joe Perches To: git Date: Thu, 26 Oct 2017 08:02:50 -0700 Content-Type: text/plain; charset="ISO-8859-1" X-Mailer: Evolution 3.26.1-1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Comparing a cache warm git grep vs command line grep shows significant differences in cpu & wall clock. Any ideas how to improve this? $ time git grep "\bseq_.*%p\W" | wc -l 112 real 0m4.271s user 0m15.520s sys 0m0.395s $ time grep -r --include=*.[ch] "\bseq_.*%p\W" * | wc -l 112 real 0m1.164s user 0m0.847s sys 0m0.314s