Thread

Re: [HACKERS] Memory leaks?

Maurice Gittens <mgittens@gits.nl> — 1998-02-13T11:51:55Z

-----Original Message-----
From: Vadim B. Mikheev <vadim@sable.krasnoyarsk.su>
To: Maurice Gittens <mgittens@gits.nl>
Cc: hackers@postgreSQL.org <hackers@postgreSQL.org>
Date: vrijdag 13 februari 1998 18:36
Subject: Re: [HACKERS] Memory leaks?


>Maurice Gittens wrote:
>> 
>> Ok, I have an application which uses posgresql.
>> 
>> While testing the system (inserting many records into
>> a database (with large objects) the system ran out of memory
>> (the system has 64M RAM + 128M SWAP). Sorting the processes
>> according to memory usage showed me a postgres process with 160M of
>> memory (+-80%) used.
>

>Version ?
>OS ?
>INSERTs are inside BEGIN/END ? Was -DTBL_FREE_CMD_MEMORY used if YES and
>version is < 6.3 ?
>
>Vadim

Sorry, should have been more complete.

- Postgresql Version:  6.3 (recent (this week) snapshop)
- OS: Linux 2.0.33
- INSERT's are within BEGIN/END brackets
- TBL_FREE_CMD_MEMORY is defined in config.h (I guess it's the default).

Hope this helps.

Re: [HACKERS] Memory leaks?

Vadim B. Mikheev <vadim@sable.krasnoyarsk.su> — 1998-02-13T12:31:50Z

Maurice Gittens wrote:
> 
> - Postgresql Version:  6.3 (recent (this week) snapshop)
> - OS: Linux 2.0.33
> - INSERT's are within BEGIN/END brackets
> - TBL_FREE_CMD_MEMORY is defined in config.h (I guess it's the default).
                                                        ^^^^^^^^^^^^^^^^ - in 6.3
Well, this means that problem lies in large objects...
I never used them... I assume that new relation and index
is created for each LO. If this is right then we have memory leak
in relation cache (heap_close doesn't flush relation from cache).
Also, as I see now, LO interface uses its own memory context:
TBL_FREE_CMD_MEMORY can't help here -> all allocation must be
freed "manually".

Unfortunately, I haven't time...

Vadim