Re: UndoDB's performance

[Hui Zhu <teawater@gmail.com>]

Try undodb.

On Mon, Dec 14, 2009 at 21:18, Sean Chen <sean.chen1234@gmail.com> wrote:
> 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
>