Olivier Doucet writes:
> Performance are now correct :) I checked with valgrind / callgrind,
> and function mysql_data_seek is not called anymore.
>
> You can now patch other drivers, and maybe release a new version ?
I've updated the remaining drivers and the driver documentation. Did
anyone
Olivier Doucet was heard to say:
>> Do you have any numbers? Would be nice to know what speed gain this
>> (almost) one-line optimization effected.
>
> I've done a benchmark with rrdtool that uses libdbi.
> http://tof.canardpc.com/view/31953cab-4329-45e9-9e30-eed2d9148ee1.jpg
> max value on X-Axi
> libdbi-drivers uses the mysql_config script shipped with MySQL to
> obtain the list of required libraries to link against, *unless* you
> use the --with-mysql-libdir configure switch.
Yes I was using this configure switch. I copied configure line from
Red Hat SRPM.
> Do you have any numbers? Wou
Olivier Doucet was heard to say:
Hi,
> I finally succeeded in compiling both component for my system (I added
> flag -lpthread when both linking / compiling or else I have following
> error : '/usr/lib64/dbd/libdbdmysql.so: undefined symbol:
> pthread_mutex_trylock').
libdbi-drivers uses the my
Hello,
> I've implemented the suggested changes and checked in the updated
> files. If you want to speed test the code, please check out, build,
> and install the current cvs revisions of both libdbi and
> libdbi-drivers.
I finally succeeded in compiling both component for my system (I added
flag
Markus Hoenicka writes:
> Hi,
>
> I'll have to read the code again a little more thoroughly, but to the
> best of my knowledge libdbi emulates MySQL's approach to retrieving
> rows from result sets. In order to walk through the rows of e.g. a
> PostgreSQL result set you have to retriev
Mike Rylander was heard to say:
> Markus,
>
> Would it be worth the ugliness of a module-global variable to bury the
> value of the row index used in the previous call to
> dbd_mysql.c::dbd_goto_row()
> inside the MySQL driver itself, side-stepping the function signature change
> for other dri
Markus,
Would it be worth the ugliness of a module-global variable to bury the
value of the row index used in the previous call to dbd_mysql.c::dbd_goto_row()
inside the MySQL driver itself, side-stepping the function signature change
for other drivers? The benefit of avoiding the API change may
Olivier Doucet was heard to say:
> Hi Markus,
>
> 2013/1/8 Markus Hoenicka :
>> We could modify the driver function
>> dbd_goto_row() by passing both the wanted row index rowidx and the
>> current row index currowidx(which libdbi keeps track of anyway).
>
> This is one way to fix the problem, I a
Hi Markus,
2013/1/8 Markus Hoenicka :
> We could modify the driver function
> dbd_goto_row() by passing both the wanted row index rowidx and the
> current row index currowidx(which libdbi keeps track of anyway).
This is one way to fix the problem, I agree. Unfortunately my level in
C is too low t
Olivier Doucet was heard to say:
> Hello everyone,
>
> I'm following a quite old topic about libdbi speed issues.
> I was able to track the cause of these issues : The major problem is
> how libdbi goes from one row to another.
>
> RRDTool (the tool that used libdbi and that I was inspecting) is
Hello everyone,
I'm following a quite old topic about libdbi speed issues.
I was able to track the cause of these issues : The major problem is
how libdbi goes from one row to another.
RRDTool (the tool that used libdbi and that I was inspecting) is using
dbi_result_next_row() function (as stated
Hi Markus,
I definitely can, anecdotal evidence suggests to me that this issue does not
occur on postgres (I use rrdtool+postgres similarly and havne't seen the
issue), but I'll make some actual tests and report back.
-Adam
On Jul 9, 2011, at 8:39 AM, markus.hoeni...@mhoenicka.de wrote:
> Ad
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