Re: server gets slow at certain time

At present,
checkpoint_segment=3
checkpoint_timeout=300

On 10/29/10, Thom Brown <thom(at)linux(dot)com> wrote:
> On 29 October 2010 13:24, AI Rumman <rummandba(at)gmail(dot)com> wrote:
>
>> I am using Postgresql 8.1 in 8-cpu cores with 32 gb ram with CestOS 5.
>> I have different DBs in the system and the large one is 12 GB and it is a
>> CRM DB and heavily used.
>> Every day after 1 pm the system gets slow and after analyzing the nmon
>> spreadsheet, I found that IO spike at that period.
>> Users write data much at that period of time.
>> DB parameters are as follows:
>> max_connections= 500
>> shared_buffers=122144
>> effective_cache_size = 1835010
>> work_mem = 8192
>> max_fsm_pages= 356656
>> fsync=on
>> commit_delay=0
>> commit_siblings= 5
>> random_page_cost = 0.01
>> default_statistics_target=100
>> wah_buffers = 500
>>
>> Any idea please how to find the bottleneck and improve performance.
>> Let me know if any more information is needed.
>>
>>
> What's your checkpoint_segments setting? You may wish to up it if you're
> getting many inserts/updates.
>
> --
> Thom Brown
> Twitter: @darkixion
> IRC (freenode): dark_ixion
> Registered Linux user: #516935
>