From: Sean Chen <sean.chen1234@gmail.com>
To: gdb@sourceware.org
Subject: UndoDB's performance
Date: Fri, 04 Dec 2009 15:35:00 -0000 [thread overview]
Message-ID: <5e81cb500912040734u5ce67afdpd6a2d0e63173f908@mail.gmail.com> (raw)
On UndoDb’s 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
next reply other threads:[~2009-12-04 15:35 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-04 15:35 Sean Chen [this message]
2009-12-14 11:14 ` Hui Zhu
2009-12-14 13:18 ` Sean Chen
2009-12-14 15:08 ` Hui Zhu
2009-12-15 2:40 ` Sean Chen
2009-12-15 3:56 ` Hui Zhu
2009-12-15 7:26 ` Sean Chen
2009-12-15 9:11 ` Greg Law
2009-12-15 13:50 ` Marc Khouzam
2009-12-17 2:26 ` Sean Chen
2009-12-17 14:41 ` Marc Khouzam
2009-12-17 20:03 ` Michael Snyder
2009-12-18 3:35 ` Hui Zhu
2009-12-18 10:33 ` Sean Chen
2010-01-05 2:47 ` Hui Zhu
2010-01-05 15:34 ` Sean Chen
2010-01-06 3:14 ` Hui Zhu
2010-01-06 8:24 ` Sean Chen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5e81cb500912040734u5ce67afdpd6a2d0e63173f908@mail.gmail.com \
--to=sean.chen1234@gmail.com \
--cc=gdb@sourceware.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox