Hi all,

Here is a blog post describing my progress so far:
http://igniting.in/gsoc2014/2014/08/04/progress-so-far/

Comments and suggestions are welcome.

Regards
Anshu Avinash


On Wed, Jul 9, 2014 at 1:14 AM, Roberto Spadim <roberto@spadim.com.br> wrote:
please include the output (solutions.txt) link too, to check what happened

2014-07-08 16:24 GMT-03:00 Roberto Spadim <roberto@spadim.com.br>:
> http://www.netlib.org/lapack/lapacke.html
> a C api to lapack
>
> 2014-07-08 16:23 GMT-03:00 Roberto Spadim <roberto@spadim.com.br>:
>> check lapack lib, i used it some years ago, and it solve linear
>> equations, at least you don't waste time with 'how to solve linear
>> equations', if you want to study :) lapack was a nice lib, at least i
>> used without problems
>>
>> 2014-07-08 16:04 GMT-03:00 Roberto Spadim <roberto@spadim.com.br>:
>>> a1,a2 is what your solve equation function is saving?
>>> and you want know t1,t2,t3..t130, to understand how much time each
>>> 'read function' take, that's it?
>>>
>>> doing this, what's the next step? this is a start point to select
>>> what's better? index vs table scan?
>>>
>>>
>>>
>>> 2014-07-08 15:54 GMT-03:00 Anshu Avinash <anshu.avinash35@gmail.com>:
>>>> Hi,
>>>>
>>>> a1, a2, ..., a130 are coefficients. t1, t2, .., t130 are unknowns. We need
>>>> 130 linearly independent equations to solve for these variables. We can
>>>> never get 130 linearly independent equations as some of the coefficients
>>>> would be 0 every time. Hence, we get an approximate solution by forming an
>>>> overdetermined system (http://en.wikipedia.org/wiki/Overdetermined_system).
>>>> Let me know if you have any further doubts.
>>>>
>>>> Regards
>>>> Anshu Avinash
>>>>
>>>>
>>>> On Wed, Jul 9, 2014 at 12:18 AM, Roberto Spadim <roberto@spadim.com.br>
>>>> wrote:
>>>>>
>>>>> ops, linear equation
>>>>>
>>>>> 2014-07-08 15:47 GMT-03:00 Roberto Spadim <roberto@spadim.com.br>:
>>>>> > going back...
>>>>> > a1t1 + a2t2 + … + a130t130= ttotal
>>>>> >
>>>>> > a1, t1...
>>>>> >
>>>>> > a1 is something you don't know
>>>>> > t1 is the coefficients[i]?
>>>>> >
>>>>> > it's a first order equation, right?
>>>>> >
>>>>> >
>>>>> >
>>>>> > 2014-07-08 15:20 GMT-03:00 Anshu Avinash <anshu.avinash35@gmail.com>:
>>>>> >> Hi,
>>>>> >>
>>>>> >> The idea is we know the total time the query took, and how many times
>>>>> >> an
>>>>> >> operation was performed. For example, consider the case of 'read_time'.
>>>>> >> We
>>>>> >> know how many times an index read took place, but don't know how much
>>>>> >> time
>>>>> >> does it take to do an index read. By solving these equations, we are
>>>>> >> trying
>>>>> >> to find out time for individual operations. coefficients[i].value is
>>>>> >> `how
>>>>> >> many time the operation i took place in a single query.`
>>>>> >>
>>>>> >> Hope this clears things up.
>>>>> >>
>>>>> >> Regards
>>>>> >> Anshu Avinash
>>>>> >>
>>>>> >>
>>>>> >> On Tue, Jul 8, 2014 at 10:57 PM, Roberto Spadim <roberto@spadim.com.br>
>>>>> >> wrote:
>>>>> >>>
>>>>> >>> just to understand...
>>>>> >>> --- the solve_equation part, today only used to save information:
>>>>> >>>   std::ofstream datafile;
>>>>> >>>   char file_name[100];
>>>>> >>>   my_snprintf(file_name, 100,
>>>>> >>> "/tmp/mariadb_cost_coefficients_%lu.txt", thread_id);
>>>>> >>>   datafile.open(file_name, std::ios::app);
>>>>> >>>   for(int i=0; i < MAX_CONSTANTS; i++)
>>>>> >>>     datafile << coefficients[i].value << " ";
>>>>> >>>   datafile << total_time << "\n";
>>>>> >>>   datafile.close();
>>>>> >>> ----
>>>>> >>>
>>>>> >>> the idea is: given a query and some coefficients[i].value, you got
>>>>> >>> total_time need to execute the query
>>>>> >>> you want to "train" something to tell you how many time the same query
>>>>> >>> should execute?
>>>>> >>> or, what's the "x[i]" variables from your system (hardware/hard
>>>>> >>> disk/etc), and extend this to others queries?
>>>>> >>>
>>>>> >>>
>>>>> >>> 2014-07-08 14:20 GMT-03:00 Roberto Spadim <roberto@spadim.com.br>:
>>>>> >>> > =] nice
>>>>> >>> >
>>>>> >>> > 2014-07-08 14:18 GMT-03:00 Anshu Avinash
>>>>> >>> > <anshu.avinash35@gmail.com>:
>>>>> >>> >> Hi all,
>>>>> >>> >>
>>>>> >>> >> You can download it here
>>>>> >>> >>
>>>>> >>> >>
>>>>> >>> >> (https://drive.google.com/file/d/0B7NiQb4EbbUVNVJFZ2xkRVR3Ylk/edit?usp=sharing).
>>>>> >>> >> It is around 26M. I have added the link on blog too.
>>>>> >>> >>
>>>>> >>> >> Regards
>>>>> >>> >> Anshu
>>>>> >>> >>
>>>>> >>> >>
>>>>> >>> >> On Tue, Jul 8, 2014 at 10:38 PM, Roberto Spadim
>>>>> >>> >> <roberto@spadim.com.br>
>>>>> >>> >> wrote:
>>>>> >>> >>>
>>>>> >>> >>> could you 'display' the dataset you used with octave?
>>>>> >>> >>>
>>>>> >>> >>> 2014-07-08 13:55 GMT-03:00 Anshu Avinash
>>>>> >>> >>> <anshu.avinash35@gmail.com>:
>>>>> >>> >>> > Hi all,
>>>>> >>> >>> >
>>>>> >>> >>> > This week's blog post is at:
>>>>> >>> >>> > http://igniting.in/gsoc2014/2014/07/08/solving-linear-equations/
>>>>> >>> >>> > .
>>>>> >>> >>> > Sorry
>>>>> >>> >>> > for
>>>>> >>> >>> > the delay.
>>>>> >>> >>> > Suggestions for an approach to solve the system of linear
>>>>> >>> >>> > equations
>>>>> >>> >>> > are
>>>>> >>> >>> > welcome.
>>>>> >>> >>> >
>>>>> >>> >>> > Regards
>>>>> >>> >>> > Anshu Avinash
>>>>> >>> >>> >
>>>>> >>> >>> >
>>>>> >>> >>> > On Mon, Jun 23, 2014 at 7:39 PM, Roberto Spadim
>>>>> >>> >>> > <roberto@spadim.com.br>
>>>>> >>> >>> > wrote:
>>>>> >>> >>> >>
>>>>> >>> >>> >> " MDEV. "
>>>>> >>> >>> >> it's nice to put full name (MDEV-350), since google and others
>>>>> >>> >>> >> search
>>>>> >>> >>> >> engines help when someone try to find information about mdev
>>>>> >>> >>> >> 350
>>>>> >>> >>> >>
>>>>> >>> >>> >> text is ok :)
>>>>> >>> >>> >>
>>>>> >>> >>> >> 2014-06-23 11:04 GMT-03:00 Anshu Avinash
>>>>> >>> >>> >> <anshu.avinash35@gmail.com>:
>>>>> >>> >>> >> > Hi,
>>>>> >>> >>> >> >
>>>>> >>> >>> >> > Sorry for the confusion, this is the new link:
>>>>> >>> >>> >> > http://igniting.in/gsoc2014/2014/06/23/work-before-mid-term/
>>>>> >>> >>> >> > Thanks for pointing out.
>>>>> >>> >>> >> >
>>>>> >>> >>> >> > Regards
>>>>> >>> >>> >> > Anshu
>>>>> >>> >>> >> >
>>>>> >>> >>> >> >
>>>>> >>> >>> >> > On Mon, Jun 23, 2014 at 7:32 PM, Roberto Spadim
>>>>> >>> >>> >> > <roberto@spadim.com.br>
>>>>> >>> >>> >> > wrote:
>>>>> >>> >>> >> >>
>>>>> >>> >>> >> >> "Sorry this page does not exist =("
>>>>> >>> >>> >> >>
>>>>> >>> >>> >> >> 2014-06-23 8:07 GMT-03:00 Anshu Avinash
>>>>> >>> >>> >> >> <anshu.avinash35@gmail.com>:
>>>>> >>> >>> >> >> > Hi all,
>>>>> >>> >>> >> >> >
>>>>> >>> >>> >> >> > You can find this week's blog entry at:
>>>>> >>> >>> >> >> > http://igniting.in/2014/06/23/work-before-mid-term/
>>>>> >>> >>> >> >> > Suggestions/reviews are welcome.
>>>>> >>> >>> >> >> >
>>>>> >>> >>> >> >> > Regards
>>>>> >>> >>> >> >> > Anshu Avinash
>>>>> >>> >>> >> >> >
>>>>> >>> >>> >> >> >
>>>>> >>> >>> >> >> > On Mon, Jun 9, 2014 at 7:30 PM, Roberto Spadim
>>>>> >>> >>> >> >> > <roberto@spadim.com.br>
>>>>> >>> >>> >> >> > wrote:
>>>>> >>> >>> >> >> >>
>>>>> >>> >>> >> >> >> Well i wws reading your posts
>>>>> >>> >>> >> >> >> Do you need big data to test read and scan times?
>>>>> >>> >>> >> >> >>
>>>>> >>> >>> >> >> >> Em segunda-feira, 9 de junho de 2014, Anshu Avinash
>>>>> >>> >>> >> >> >> <anshu.avinash35@gmail.com> escreveu:
>>>>> >>> >>> >> >> >>
>>>>> >>> >>> >> >> >>> Hi all,
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> You can find this week's blog entry at
>>>>> >>> >>> >> >> >>> http://igniting.in/gsoc2014/2014/06/09/more-coding/. I'm
>>>>> >>> >>> >> >> >>> now
>>>>> >>> >>> >> >> >>> maintaining the
>>>>> >>> >>> >> >> >>> code only on github:
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> https://github.com/igniting/server/tree/selfTuningOptimizer.
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> Regards
>>>>> >>> >>> >> >> >>> Anshu Avinash
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> On Sun, May 25, 2014 at 3:27 PM, Anshu Avinash
>>>>> >>> >>> >> >> >>> <anshu.avinash35@gmail.com> wrote:
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> Hi all,
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> You can find my this week's blog entry at
>>>>> >>> >>> >> >> >>> http://igniting.in/gsoc2014/2014/05/25/coding-things-up/
>>>>> >>> >>> >> >> >>> . I
>>>>> >>> >>> >> >> >>> have
>>>>> >>> >>> >> >> >>> created a
>>>>> >>> >>> >> >> >>> branch on launchpad for my work:
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> http://bazaar.launchpad.net/~igniting/maria/maria/revision/4211
>>>>> >>> >>> >> >> >>> .
>>>>> >>> >>> >> >> >>> You
>>>>> >>> >>> >> >> >>> can
>>>>> >>> >>> >> >> >>> give your suggestions/reviews either on this thread or
>>>>> >>> >>> >> >> >>> as a
>>>>> >>> >>> >> >> >>> comment
>>>>> >>> >>> >> >> >>> on
>>>>> >>> >>> >> >> >>> the
>>>>> >>> >>> >> >> >>> blog itself.
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> Regards
>>>>> >>> >>> >> >> >>> Anshu Avinash
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> On Tue, May 20, 2014 at 1:22 AM, Roberto Spadim
>>>>> >>> >>> >> >> >>> <roberto@spadim.com.br>
>>>>> >>> >>> >> >> >>> wrote:
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> wow a big work, congratulation guy, i will read part by
>>>>> >>> >>> >> >> >>> part
>>>>> >>> >>> >> >> >>> to
>>>>> >>> >>> >> >> >>> better
>>>>> >>> >>> >> >> >>> understand mariadb code
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> 2014-05-19 16:33 GMT-03:00 Anshu Avinash
>>>>> >>> >>> >> >> >>> <anshu.avinash35@gmail.com>:
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> Hi all,
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> This week's blog entry would get delayed by couple of
>>>>> >>> >>> >> >> >>> days.
>>>>> >>> >>> >> >> >>> I
>>>>> >>> >>> >> >> >>> have
>>>>> >>> >>> >> >> >>> started coding though and would like to give heads up on
>>>>> >>> >>> >> >> >>> what
>>>>> >>> >>> >> >> >>> I'm
>>>>> >>> >>> >> >> >>> doing.
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> I've looked at the diffs for "Cost model project" of
>>>>> >>> >>> >> >> >>> mysql:
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> http://bazaar.launchpad.net/~mysql/mysql-server/5.7/revision/7596
>>>>> >>> >>> >> >> >>> and
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> http://bazaar.launchpad.net/~mysql/mysql-server/5.7/revision/7222 .
>>>>> >>> >>> >> >> >>> These
>>>>> >>> >>> >> >> >>> give a pretty good idea about what are the hard-coded
>>>>> >>> >>> >> >> >>> constants
>>>>> >>> >>> >> >> >>> and
>>>>> >>> >>> >> >> >>> where
>>>>> >>> >>> >> >> >>> are they being used.
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> The idea is to multiply "READ_TIME_FACTOR" and
>>>>> >>> >>> >> >> >>> "SCAN_TIME_FACTOR"
>>>>> >>> >>> >> >> >>> to
>>>>> >>> >>> >> >> >>> the
>>>>> >>> >>> >> >> >>> values returned by read_time() and scan_time() in
>>>>> >>> >>> >> >> >>> handler.h,
>>>>> >>> >>> >> >> >>> while
>>>>> >>> >>> >> >> >>> returning. These values would be read from a table in
>>>>> >>> >>> >> >> >>> mysql
>>>>> >>> >>> >> >> >>> db.
>>>>> >>> >>> >> >> >>> For
>>>>> >>> >>> >> >> >>> that
>>>>> >>> >>> >> >> >>> I've looked at sql_statistics.cc. After completing this,
>>>>> >>> >>> >> >> >>> I'll
>>>>> >>> >>> >> >> >>> first
>>>>> >>> >>> >> >> >>> change
>>>>> >>> >>> >> >> >>> the values of these constants manually and check if the
>>>>> >>> >>> >> >> >>> better
>>>>> >>> >>> >> >> >>> or
>>>>> >>> >>> >> >> >>> worse
>>>>> >>> >>> >> >> >>> query plans are being selected. I'll first do the last
>>>>> >>> >>> >> >> >>> step
>>>>> >>> >>> >> >> >>> manually,
>>>>> >>> >>> >> >> >>> to
>>>>> >>> >>> >> >> >>> check if everything is working as expected and later
>>>>> >>> >>> >> >> >>> automate
>>>>> >>> >>> >> >> >>> it.
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> Regards
>>>>> >>> >>> >> >> >>> Anshu
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> On Mon, May 12, 2014 at 11:22 AM, Anshu Avinash
>>>>> >>> >>> >> >> >>> <anshu.avinash35@gmail.com> wrote:
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> Hi all,
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> You can find my blog entry for this week at
>>>>> >>> >>> >> >> >>> http://igniting.in/gsoc2014/2014/05/11/first-steps/ .
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> Regards
>>>>> >>> >>> >> >> >>> Anshu Avinash
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> On Thu, May 8, 2014 at 11:46 PM, Anshu Avinash
>>>>> >>> >>> >> >> >>> <anshu.avinash35@gmail.com> wrote:
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> Hi all,
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> Sorry for the irregular updates. I had been busy for
>>>>> >>> >>> >> >> >>> last
>>>>> >>> >>> >> >> >>> couple
>>>>> >>> >>> >> >> >>> of
>>>>> >>> >>> >> >> >>> days
>>>>> >>> >>> >> >> >>> and might still be busy for 1-2 days more. I would be
>>>>> >>> >>> >> >> >>> completely
>>>>> >>> >>> >> >> >>> free
>>>>> >>> >>> >> >> >>> starting next week, and would be updating my blog weekly
>>>>> >>> >>> >> >> >>> on
>>>>> >>> >>> >> >> >>> every
>>>>> >>> >>> >> >> >>> Monday (so
>>>>> >>> >>> >> >> >>> 1st update would be on May 12). I would also send the
>>>>> >>> >>> >> >> >>> link
>>>>> >>> >>> >> >> >>> of my
>>>>> >>> >>> >> >> >>> post
>>>>> >>> >>> >> >> >>> weekly
>>>>> >>> >>> >> >> >>> on the mailing list.
>>>>> >>> >>> >> >> >>>
>>>>> >>> >>> >> >> >>> As discussed on irc, I started to explore the pair of
>>>>> >>> >>> >> >> >>> constants:
>>>>> >>> >>> >> >> >>> handler::scan_time() and handler::read_time().
>>>>> >>> >>> >> >> >>
>>>>> >>> >>> >> >> >>
>>>>> >>> >>> >> >> >>
>>>>> >>> >>> >> >> >> --
>>>>> >>> >>> >> >> >> Roberto Spadim
>>>>> >>> >>> >> >> >> SPAEmpresarial
>>>>> >>> >>> >> >> >> Eng. Automação e Controle
>>>>> >>> >>> >> >> >>
>>>>> >>> >>> >> >> >
>>>>> >>> >>> >> >>
>>>>> >>> >>> >> >>
>>>>> >>> >>> >> >>
>>>>> >>> >>> >> >> --
>>>>> >>> >>> >> >> Roberto Spadim
>>>>> >>> >>> >> >> SPAEmpresarial
>>>>> >>> >>> >> >> Eng. Automação e Controle
>>>>> >>> >>> >> >
>>>>> >>> >>> >> >
>>>>> >>> >>> >>
>>>>> >>> >>> >>
>>>>> >>> >>> >>
>>>>> >>> >>> >> --
>>>>> >>> >>> >> Roberto Spadim
>>>>> >>> >>> >> SPAEmpresarial
>>>>> >>> >>> >> Eng. Automação e Controle
>>>>> >>> >>> >
>>>>> >>> >>> >
>>>>> >>> >>>
>>>>> >>> >>>
>>>>> >>> >>>
>>>>> >>> >>> --
>>>>> >>> >>> Roberto Spadim
>>>>> >>> >>> SPAEmpresarial
>>>>> >>> >>> Eng. Automação e Controle
>>>>> >>> >>
>>>>> >>> >>
>>>>> >>> >
>>>>> >>> >
>>>>> >>> >
>>>>> >>> > --
>>>>> >>> > Roberto Spadim
>>>>> >>> > SPAEmpresarial
>>>>> >>> > Eng. Automação e Controle
>>>>> >>>
>>>>> >>>
>>>>> >>>
>>>>> >>> --
>>>>> >>> Roberto Spadim
>>>>> >>> SPAEmpresarial
>>>>> >>> Eng. Automação e Controle
>>>>> >>
>>>>> >>
>>>>> >
>>>>> >
>>>>> >
>>>>> > --
>>>>> > Roberto Spadim
>>>>> > SPAEmpresarial
>>>>> > Eng. Automação e Controle
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Roberto Spadim
>>>>> SPAEmpresarial
>>>>> Eng. Automação e Controle
>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> Roberto Spadim
>>> SPAEmpresarial
>>> Eng. Automação e Controle
>>
>>
>>
>> --
>> Roberto Spadim
>> SPAEmpresarial
>> Eng. Automação e Controle
>
>
>
> --
> Roberto Spadim
> SPAEmpresarial
> Eng. Automação e Controle



--
Roberto Spadim
SPAEmpresarial
Eng. Automação e Controle