Re: UndoDB's performance

[Sean Chen <sean.chen1234@gmail.com>]

On Mon, Dec 14, 2009 at 7:14 PM, Hui Zhu <teawater@gmail.com> wrote:
> 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
>>
>

That’s UndoDB’s ad on its website.

In my experiment, gdb-7 reverse runs apps about 22,000x slower.

-- 
Best Regards,
Sean Chen