I'm trying to compile PG on Ubuntu in order to hack tuplesort.c code
I just downloaded and unpacked the source code and red README and INSTALL files.
I'm going to
./configure --enable-debug --enable-cassert --enable-depend
then I would
make
make install
Can I improve something adding some missing option/command to the above steps?
Where and how to apply the TRACE_SORT option?
Any other useful options?
Sorry, I'm not so expert on Linux/PostgreSQL/gcc/make etc etc.
Thanks for your time.
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> Date: Mon, 26 Nov 2007 11:09:54 -0800
> From: tkordas@greenplum.com
> To: mac_man2005@hotmail.it
> CC: pgsql-hackers@postgresql.org
> Subject: Re: [HACKERS] Replacement Selection
>
> mac_man2005@hotmail.it wrote:
>> I also implemented
>> Replacement Selection (RS) so if I'm able to integrate my RS I hope I
>> would be able to integrate the others too.
>
> The existing code implements RS. Tom asked you to describe what improvements
> you hope to make; I'm confident that he already understands how to implement
> RS. :-)
>
> **
>
> Why don't you compile with TRACE_SORT enabled and watch the log output.
>
> The function in tuplesort.c that you should start with is puttuple_common().
>
> in puttuple_common(), the transition from an internal to external sort is
> performed at the bottom of the TSS_INITIAL case in the main switch
> statement. The function dumptuples() heapifies the in-core tuples (divides
> the in-core tuples into initial runs and then advances the state to
> TSS_BUILDRUNS). All subsequent tuples will hit the TSS_BUILDRUNS case and
> will insert tuples into the heap; emitting tuples for the current run as it
> goes.
>
> I recommend you run the code in the debugger on a external-sorting query:
> watch two or three tuples go into the heap and you'll get the idea.
>
> The top of the heap is at state->memtuples[0] the heap goes down from there.
> New tuples are added there and the heap is adjusted (Using the
> tuplesort_heap_siftup() function).
>
> -Tim
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