From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jakub Narebski Subject: Re: Why Git is so fast Date: Thu, 30 Apr 2009 17:28:04 +0200 Message-ID: <200904301728.06989.jnareb@gmail.com> References: <46a038f90904270155i6c802fceoffc73eb5ab57130e@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cc: Martin Langhoff , Git Mailing List To: Michael Witten X-From: git-owner@vger.kernel.org Thu Apr 30 17:28:23 2009 Return-path: Envelope-to: gcvg-git-2@gmane.org Received: from vger.kernel.org ([209.132.176.167]) by lo.gmane.org with esmtp (Exim 4.50) id 1LzYBS-0005VH-IA for gcvg-git-2@gmane.org; Thu, 30 Apr 2009 17:28:23 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761492AbZD3P2N (ORCPT ); Thu, 30 Apr 2009 11:28:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758345AbZD3P2N (ORCPT ); Thu, 30 Apr 2009 11:28:13 -0400 Received: from mail-ew0-f176.google.com ([209.85.219.176]:61515 "EHLO mail-ew0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756559AbZD3P2M (ORCPT ); Thu, 30 Apr 2009 11:28:12 -0400 Received: by ewy24 with SMTP id 24so1974925ewy.37 for ; Thu, 30 Apr 2009 08:28:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:to:subject:date :user-agent:cc:references:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:message-id; bh=Z7tpp64XUtZba96OVatYlUBl3ysIgQjbKpEUecg4ZUY=; b=IhjBZMrrQJUVh2FoBSonuvC/S5Gx7oAcCCLC7w1hgnwEvmBBCRvI6zqcBPvwL60wh+ qAzcyUlkaZGZnrSjDhzZ+AGHOhQTAoGcv5Qfr1lkZhvKOD723cw2snQ9MgtsRFRnElWN mh4cGUMRwwkiTSOAX6q3fLW6X83WNo3Pi2S4g= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:subject:date:user-agent:cc:references:in-reply-to :mime-version:content-type:content-transfer-encoding :content-disposition:message-id; b=kLJfjvuaBONgxrEmyKC6egl+bh66CNt0MwkKtfuIK8MdFdDRpzxiXWkzg4Bi15xkbP MYC6NN7z4eabC3Exh8fFw/R5p1TcSh4/+pSZ5ALqpe/8GW3wHQOsuAVrkD4/9yjQ6P63 TyPNgTmDwfh9R3PE0gWyDziBtat8yNUxBUvGQ= Received: by 10.216.19.212 with SMTP id n62mr540739wen.66.1241105291149; Thu, 30 Apr 2009 08:28:11 -0700 (PDT) Received: from ?192.168.1.13? (abwf75.neoplus.adsl.tpnet.pl [83.8.229.75]) by mx.google.com with ESMTPS id j8sm5949394gvb.11.2009.04.30.08.28.10 (version=TLSv1/SSLv3 cipher=RC4-MD5); Thu, 30 Apr 2009 08:28:10 -0700 (PDT) User-Agent: KMail/1.9.3 In-Reply-To: Content-Disposition: inline Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: On Thu, 30 Apr 2009, Michael Witten wrote: > On Thu, Apr 30, 2009 at 07:17, Jakub Narebski wrote: > > I hope that JGit developers can > > tell us whether using higher level language affects performance, how > > much, and what features of higher-level language are causing decrease > > in performance. > > Java is definitely higher than C, but you can do some pretty low-level > operations on bits and bytes and the like, not to mention the presence > of a JIT. > > My point: I don't think that Java can tell us anything special in this regard. Let's rephrase question a bit then: what low-level operation were needed for good performance in JGit? -- Jakub Narebski Poland