maria-developers team mailing list archive

[Roberto Spadim <roberto@xxxxxxxxxxxxx>]

http://www.netlib.org/lapack/lapacke.html
a C api to lapack

2014-07-08 16:23 GMT-03:00 Roberto Spadim <roberto@xxxxxxxxxxxxx>:
> 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@xxxxxxxxxxxxx>:
>> 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@xxxxxxxxx>:
>>> 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@xxxxxxxxxxxxx>
>>> wrote:
>>>>
>>>> ops, linear equation
>>>>
>>>> 2014-07-08 15:47 GMT-03:00 Roberto Spadim <roberto@xxxxxxxxxxxxx>:
>>>> > 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@xxxxxxxxx>:
>>>> >> 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@xxxxxxxxxxxxx>
>>>> >> 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@xxxxxxxxxxxxx>:
>>>> >>> > =] nice
>>>> >>> >
>>>> >>> > 2014-07-08 14:18 GMT-03:00 Anshu Avinash
>>>> >>> > <anshu.avinash35@xxxxxxxxx>:
>>>> >>> >> 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@xxxxxxxxxxxxx>
>>>> >>> >> wrote:
>>>> >>> >>>
>>>> >>> >>> could you 'display' the dataset you used with octave?
>>>> >>> >>>
>>>> >>> >>> 2014-07-08 13:55 GMT-03:00 Anshu Avinash
>>>> >>> >>> <anshu.avinash35@xxxxxxxxx>:
>>>> >>> >>> > 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@xxxxxxxxxxxxx>
>>>> >>> >>> > 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@xxxxxxxxx>:
>>>> >>> >>> >> > 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@xxxxxxxxxxxxx>
>>>> >>> >>> >> > wrote:
>>>> >>> >>> >> >>
>>>> >>> >>> >> >> "Sorry this page does not exist =("
>>>> >>> >>> >> >>
>>>> >>> >>> >> >> 2014-06-23 8:07 GMT-03:00 Anshu Avinash
>>>> >>> >>> >> >> <anshu.avinash35@xxxxxxxxx>:
>>>> >>> >>> >> >> > 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@xxxxxxxxxxxxx>
>>>> >>> >>> >> >> > 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@xxxxxxxxx> 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@xxxxxxxxx> 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@xxxxxxxxxxxxx>
>>>> >>> >>> >> >> >>> 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@xxxxxxxxx>:
>>>> >>> >>> >> >> >>>
>>>> >>> >>> >> >> >>> 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@xxxxxxxxx> 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@xxxxxxxxx> 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