Shared buffers seem too low to me, usually you go for 20 - 25% of RAM for a dedicated DB server. work_mem also seems
low,but that depends on your actual queries. You should at least log the usage of temp files and maybe look into
pgbadgerto analyze your logs.
Max_connections is way too high - espcially when you use a pooler. I get along using ca. 100 connections serving
severalhundreds of users using jdbc pooling.
You might want to take a look at pgtune.
Von meinem iPad gesendet
> Am 09.06.2015 um 10:07 schrieb AL-Temimi, Muthana <muthana.al-temimi@tu-harburg.hamburg.de>:
>
> Hello Jan,
>
> The shared_buffers ist 1024MB of the postgresql database and the kernel.shmmax=2147483648 (2GB) of linux OS.
>
> And here is the some postgresql configurations:
>
> work_mem=4MB
> max_connections=2800
> shared_buffers=1024MB
>
> and the configuration of pgpool
> init_childern=350
> max_pool=4
>
> Regards
> Muthana
>
> -----Ursprüngliche Nachricht-----
> Von: pgsql-admin-owner@postgresql.org [mailto:pgsql-admin-owner@postgresql.org] Im Auftrag von Jan Lentfer
> Gesendet: Montag, 8. Juni 2015 16:23
> An: pgsql-admin@postgresql.org
> Betreff: Re: [ADMIN] cache Memory of server
>
> Am 2015-06-08 15:53, schrieb AL-Temimi, Muthana:
>> See the free command:
>>
>> am 08.06.2015 um 15:13 Uhr: --active connection: 305
>>
>> srvpgsql1:/opt/pgsql_data # free
>>
>> total used free shared buffers cached
>>
>> Mem: 12199684 8758400 3441284 1269784 231324 7139400
>>
>> -/+ buffers/cache: 1387676 10812008
>>
>> Swap: 6289404 0 6289404
>>
>>
>> ----------------------------------------------------------------------
>>
>>
>> am 08.06.2015 um 15:53 Uhr: --active connection: 278
>>
>> srvpgsql1:/opt/pgsql_data # free
>>
>> total used free shared buffers cached
>>
>> Mem: 12199684 8686228 3513456 1269784 232164 7164288
>>
>> -/+ buffers/cache: 1289776 10909908
>>
>> Swap: 6289404 0 6289404
>>
>
>
> That is basically what Scott said: you are watching the Kernel FS cache. It may only be a coincidence that it
increasedtogether with the postgres sessions. A high number here is usually somehting good, because a lot of your
filesystemsreads will be served from RAM. Looking at your numbers, I would say you are "all good" (except as Scott
said,mabye try to reduce number of parallel sessions) - big fs cache and still free RAM.
> What are your settings for shared buffers btw?
>
> Jan
>
>
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