From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 31259 invoked by alias); 14 Dec 2009 15:08:07 -0000 Received: (qmail 31250 invoked by uid 22791); 14 Dec 2009 15:08:06 -0000 X-SWARE-Spam-Status: No, hits=-1.7 required=5.0 tests=AWL,BAYES_00,SARE_MSGID_LONG40,SPF_PASS X-Spam-Check-By: sourceware.org Received: from mail-iw0-f203.google.com (HELO mail-iw0-f203.google.com) (209.85.223.203) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 14 Dec 2009 15:08:01 +0000 Received: by iwn41 with SMTP id 41so1877326iwn.12 for ; Mon, 14 Dec 2009 07:08:00 -0800 (PST) MIME-Version: 1.0 Received: by 10.231.153.69 with SMTP id j5mr282922ibw.33.1260803280076; Mon, 14 Dec 2009 07:08:00 -0800 (PST) In-Reply-To: <5e81cb500912140518r2ad3f2fdrd0dd5a546e6d8a33@mail.gmail.com> References: <5e81cb500912040734u5ce67afdpd6a2d0e63173f908@mail.gmail.com> <5e81cb500912140518r2ad3f2fdrd0dd5a546e6d8a33@mail.gmail.com> From: Hui Zhu Date: Mon, 14 Dec 2009 15:08:00 -0000 Message-ID: Subject: Re: UndoDB's performance To: Sean Chen Cc: gdb@sourceware.org Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable X-IsSubscribed: yes Mailing-List: contact gdb-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sourceware.org X-SW-Source: 2009-12/txt/msg00085.txt.bz2 Try undodb. On Mon, Dec 14, 2009 at 21:18, Sean Chen wrote: > On Mon, Dec 14, 2009 at 7:14 PM, Hui Zhu wrote: >> gdb-7 reverse debugging accelerator. >> Regular gdb-7 reverse runs apps =A0 =A0 =A0 =A0 =A040,000x =A0 =A0 =A0 = =A0 =A0 =A0 =A0 =A0slower >> UndoDB+gdb-7 reverse runs apps =A0 =A0 =A0 =A0 =A0 1.7x =A0 =A0 =A0 =A0 = =A0 =A0slower! >> >> >> Are you really do some try? >> I suggest you do some test on it. =A0:) >> >> Thanks, >> Hui >> >> On Fri, Dec 4, 2009 at 23:34, Sean Chen wrote: >>> On UndoDb=92s website, I saw the following ad. >>> >>> Regular gdb-7 reverse runs apps 40,000x slower >>> UndoDB+gdb-7 reverse runs apps 1.7x slower! >>> >>> In my experiment, gdb-7 reverse does run apps more than 20,000x >>> slower. How does UndoDB improve the performance so much without a >>> simulator and without record? Below is its self-introduction on the >>> website. UndoDB's "snapshot-and-replay" technique stores periodic >>> copy-on-write snapshots of the application and only non-deterministic >>> inputs (system calls, thread-switches, shared memory reads, etc). >>> >>> Are there any obvious disadvantages in UndoDB? I tried to search >>> UndoDB in the archive of the mailing list, however, little discussion >>> is found. >>> >>> -- >>> Best Regards, >>> Sean Chen >>> >> > > That=92s UndoDB=92s ad on its website. > > In my experiment, gdb-7 reverse runs apps about 22,000x slower. > > -- > Best Regards, > Sean Chen >