[pgpool-hackers: 570] Re: Memory contexts

[Tatsuo Ishii]

Usama,

Thank you for the info! I'm going to create a README file under
utils/mmgr and put the info into it.

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp

> Hi
> 
> Below is the little description of MemoryContexts used by pgpool-II
> 
> ProcessLoopContext:
> This context resets at every main loop iteration of each process
> 
> TopMemoryContext:
> This context is same as PostgreSQL's TopMemoryContext and lives for a life
> time of process.
> 
> ErrorContext:
> Same as PostgreSQL's ErrorContext and used for error processing.
> 
> QueryContext:
> Used by pgpool-II child process and, lives for single query cycle.
> 
> Rest of the contexts are inherited from PostgreSQL code and are not used. I
> think we should remove these
> 
> --Usama
> 
> 
> On Fri, Jul 4, 2014 at 2:57 PM, Tatsuo Ishii <ishii at postgresql.org> wrote:
> 
>> Hi Usama,
>>
>> Is there any documentation regarding memory contexts?  I saw these in
>> mcxt.c but except ProcessLoopContext, there's no documention about
>> purposes for these memory context usage.
>>
>> MemoryContext TopMemoryContext = NULL;
>> MemoryContext ErrorContext = NULL;
>> MemoryContext ProcessLoopContext = NULL; /* This context resets at every
>> main loop iteration of a process */
>> MemoryContext CacheMemoryContext = NULL;
>> MemoryContext MessageContext = NULL;
>> MemoryContext QueryContext = NULL;
>> MemoryContext CurTransactionContext = NULL;
>>
>> I would like to manage memory used in pool_config.l.
>> --
>> Tatsuo Ishii
>> SRA OSS, Inc. Japan
>> English: http://www.sraoss.co.jp/index_en.php
>> Japanese:http://www.sraoss.co.jp
>>