Thread: Check Pointer

Check Pointer

From

itishree sukla

Date:

30 May 2013, 12:09:21

Hi all,

In our server Check pointer process is consuming 8 GB of memory, what could be the possible reason? Can any one please help.

Regards,

Itishree

Re: Check Pointer

From

Greg Smith

Date:

30 May 2013, 12:20:18

On 5/30/13 8:09 AM, itishree sukla wrote:
> In our server Check pointer process is consuming 8 GB of memory, what
> could be the possible reason? Can any one please help.

That process will eventually access all of shared_buffers, which shows
as a shared memory block for that process.  That's what you're seeing
there.  It doesn't actually use any significant amount of memory on its own.

--
Greg Smith   2ndQuadrant US    greg@2ndQuadrant.com   Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.com

Re: Check Pointer

From

Dinesh Kumar

Date:

30 May 2013, 12:20:57

Hi ,

Could you share the command, what you have used to confirm that, the checkpoint process is consuming 8GB. And also, please share the addition information like PostgreSQL version and the OS details.

I am suspecting that, your shared_buffers value is 8GB, and the "top" command is showing the used memory as 8GB.

Thanks.

Dinesh

--
Dinesh Kumar

Software Engineer

Ph: +918087463317

Skype ID: dinesh.kumar432

www.enterprisedb.co m

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On Thu, May 30, 2013 at 5:39 PM, itishree sukla <itishree.sukla@gmail.com> wrote:

Hi all,

In our server Check pointer process is consuming 8 GB of memory, what could be the possible reason? Can any one please help.

Regards,
Itishree

Re: Check Pointer

From

Heikki Linnakangas

Date:

30 May 2013, 12:26:56

On 30.05.2013 15:09, itishree sukla wrote:
> In our server Check pointer process is consuming 8 GB of memory, what could
> be the possible reason? Can any one please help.

Are you sure you're measuring the memory correctly? The RES field in top
output, for example, includes shared memory, ie. the whole buffer cache.
Shared memory isn't really "consumed" by the checkpointer process, but
shared by all postgres processes.

- Heikki

Re: Check Pointer

From

itishree sukla

Date:

30 May 2013, 12:45:44

Thanks for the quick response. Below is the out put of Top Commnd.

3971 postgres 20   0 8048m 303m 301m S    0 0.9   0:04.34 /usr/lib/postgresql/9.2/bin/postgres -D /var/lib/postgresql/9.2/main -c config_file=/etc/postgre
3972 postgres 20   0 66828 1820 708 S    0 0.0   1:36.37 postgres: logger process
3974 postgres 20   0 8054m 7.6g 7.6g S    0 24.1   0:56.59 postgres: checkpointer process
3975 postgres 20   0 8051m 895m 891m S    0 2.8   0:04.98 postgres: writer process
3976 postgres 20   0 8051m   9m 9072 S    0 0.0   0:35.17 postgres: wal writer process
3977 postgres 20   0 70932 3352 716 S    0 0.0   0:05.19 postgres: stats collector process
1

Postgresql =9.2.3

On Thu, May 30, 2013 at 5:56 PM, Heikki Linnakangas <hlinnakangas@vmware.com> wrote:

On 30.05.2013 15:09, itishree sukla wrote:
In our server Check pointer process is consuming 8 GB of memory, what could
be the possible reason? Can any one please help.

Are you sure you're measuring the memory correctly? The RES field in top output, for example, includes shared memory, ie. the whole buffer cache. Shared memory isn't really "consumed" by the checkpointer process, but shared by all postgres processes.

- Heikki

Re: Check Pointer

From

itishree sukla

Date:

06 June 2013, 04:44:25

Can any one give more input, you can see my top out put, in %MEM its taking 24.1.

Regards,

Itishree

On Thu, May 30, 2013 at 6:15 PM, itishree sukla <itishree.sukla@gmail.com> wrote:

Thanks for the quick response. Below is the out put of Top Commnd.

3971 postgres 20   0 8048m 303m 301m S    0 0.9   0:04.34 /usr/lib/postgresql/9.2/bin/postgres -D /var/lib/postgresql/9.2/main -c config_file=/etc/postgre
3972 postgres 20   0 66828 1820 708 S    0 0.0   1:36.37 postgres: logger process
3974 postgres 20   0 8054m 7.6g 7.6g S    0 24.1   0:56.59 postgres: checkpointer process
3975 postgres 20   0 8051m 895m 891m S    0 2.8   0:04.98 postgres: writer process
3976 postgres 20   0 8051m   9m 9072 S    0 0.0   0:35.17 postgres: wal writer process
3977 postgres 20   0 70932 3352 716 S    0 0.0   0:05.19 postgres: stats collector process
1

Postgresql =9.2.3

On Thu, May 30, 2013 at 5:56 PM, Heikki Linnakangas <hlinnakangas@vmware.com> wrote:
On 30.05.2013 15:09, itishree sukla wrote:
In our server Check pointer process is consuming 8 GB of memory, what could
be the possible reason? Can any one please help.

Are you sure you're measuring the memory correctly? The RES field in top output, for example, includes shared memory, ie. the whole buffer cache. Shared memory isn't really "consumed" by the checkpointer process, but shared by all postgres processes.

- Heikki

Re: Check Pointer

From

Kevin Grittner

Date:

06 June 2013, 12:53:33

itishree sukla <itishree.sukla@gmail.com> wrote:
> itishree sukla <itishree.sukla@gmail.com> wrote:
>> Heikki Linnakangas <hlinnakangas@vmware.com> wrote:
>>> itishree sukla wrote:
>>>
>>>> In our server Check pointer process is consuming 8 GB of
>>>> memory, what could be the possible reason? Can any one please
>>>> help.
>>>
>>> Are you sure you're measuring the memory correctly? The RES
>>> field in top output, for example, includes shared memory, ie.
>>> the whole buffer cache. Shared memory isn't really "consumed"
>>> by the checkpointer process, but shared by all postgres processes.
>>
>> Thanks for the quick response. Below is the out put of Top
>> Commnd.
>>
>> 3971 postgres  20   0 8048m 303m 301m S    0  0.9   0:04.34 3971 postgres  20   0 8048m 303m 301m S    0  0.9  
0:04.34/usr/lib/postgresql/9.2/bin/postgres -D /var/lib/postgresql/9.2/main -c config_file=/etc/postgre 
>> 3972 postgres  20   0 66828 1820  708 S    0  0.0   1:36.37 postgres: logger process
>> 3974 postgres  20   0 8054m 7.6g 7.6g S    0 24.1   0:56.59 postgres: checkpointer process
>> 3975 postgres  20   0 8051m 895m 891m S    0  2.8   0:04.98 postgres: writer process
>> 3976 postgres  20   0 8051m   9m 9072 S    0  0.0   0:35.17 postgres: wal writer process
>> 3977 postgres  20   0 70932 3352  716 S    0  0.0   0:05.19 postgres: stats collector process

> Can any one give more input, you can see my top out put, in %MEM
> its taking 24.1.

It's not.  It's referencing all of your shared_buffers.

--
Kevin Grittner
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

Re: Check Pointer

From

Bernd Helmle

Date:

07 June 2013, 08:20:07


--On 30. Mai 2013 18:15:04 +0530 itishree sukla <itishree.sukla@gmail.com>
wrote:

> Thanks for the quick response. Below is the out put of Top Commnd.
>
> 3971 postgres  20   0 8048m 303m 301m S    0  0.9   0:04.34
> /usr/lib/postgresql/9.2/bin/postgres -D /var/lib/postgresql/9.2/main -c
> config_file=/etc/postgre
>  3972 postgres  20   0 66828 1820  708 S    0  0.0   1:36.37
> postgres: logger
> process                                 
>
                                    >
 
>  3974 postgres  20   0 8054m 7.6g 7.6g S    0 24.1   0:56.59
> postgres: checkpointer
> process                                 
>                                 

On Linux i often find the pmap utility a far better tool to get an idea
what a process
actually consumes of memory. The output can be large sometimes, but it's
more "fine grained".


--
Thanks

    Bernd

Re: Check Pointer

From

Matheus de Oliveira

Date:

07 June 2013, 13:53:42

On Thu, Jun 6, 2013 at 1:44 AM, itishree sukla <itishree.sukla@gmail.com> wrote:

Can any one give more input, you can see my top out put, in %MEM its taking 24.1.

On Thu, May 30, 2013 at 6:15 PM, itishree sukla <itishree.sukla@gmail.com> wrote:
Thanks for the quick response. Below is the out put of Top Commnd.

3971 postgres 20   0 8048m 303m 301m S    0 0.9   0:04.34 /usr/lib/postgresql/9.2/bin/postgres -D /var/lib/postgresql/9.2/main -c config_file=/etc/postgre
3972 postgres 20   0 66828 1820 708 S    0 0.0   1:36.37 postgres: logger process
3974 postgres 20   0 8054m 7.6g 7.6g S    0 24.1   0:56.59 postgres: checkpointer process
3975 postgres 20   0 8051m 895m 891m S    0 2.8   0:04.98 postgres: writer process
3976 postgres 20   0 8051m   9m 9072 S    0 0.0   0:35.17 postgres: wal writer process
3977 postgres 20   0 70932 3352 716 S    0 0.0   0:05.19 postgres: stats collector process
1

Postgresql =9.2.3

On Thu, May 30, 2013 at 5:56 PM, Heikki Linnakangas <hlinnakangas@vmware.com> wrote:
On 30.05.2013 15:09, itishree sukla wrote:
In our server Check pointer process is consuming 8 GB of memory, what could
be the possible reason? Can any one please help.

Are you sure you're measuring the memory correctly? The RES field in top output, for example, includes shared memory, ie. the whole buffer cache. Shared memory isn't really "consumed" by the checkpointer process, but shared by all postgres processes.

- Heikki

As said before, the memory you may be not the real memory consumed by checkpointer process, but it includes the shared memory (which is, basically, used by all postgres' processes).
Depesz wrote a nice topic on his blog about this subject [1], read it and try the commands to see the real memory usage by checkpointer (when I say "real", I mean "private").

[1] http://www.depesz.com/2012/06/09/how-much-ram-is-postgresql-using/

Regards,

--
Matheus de Oliveira
Analista de Banco de Dados
Dextra Sistemas - MPS.Br nível F!
www.dextra.com.br/postgres