Re: UndoDB's performance

[Hui Zhu <teawater at gmail dot com>]

gdb-7 reverse debugging accelerator.
Regular gdb-7 reverse runs apps		 40,000x		slower	
UndoDB+gdb-7 reverse runs apps		 1.7x		 slower!


Are you really do some try?
I suggest you do some test on it.  :)

Thanks,
Hui

On Fri, Dec 4, 2009 at 23:34, Sean Chen <sean.chen1234@gmail.com> wrote:
> 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
>