Re: Cpu usage 100% on slave. s_lock problem.

On Tue, Sep 17, 2013 at 6:59 AM, Andres Freund <andres(at)2ndquadrant(dot)com> wrote:
> Hi,
>
> On 2013-09-17 17:55:01 +0600, Дмитрий Дегтярёв wrote:
>> We have not been able to reproduce this problem on a test servers. Use this
>> patch to production servers do not dare.
>>
>> In the course of studying the problems we have identified that many queries
>> are executed on the slave several times slower. On master function
>> heap_hot_search_buffer execute 100 cycles, on the slave the same query with
>> the same plan function heap_hot_search_buffer execute 2000 cycles.
>> Also, we were able to reproduce the problem on the master and detect that
>> there s_lock of slow queries.
>
> What you describe is normally an indication that you have too many
> longrunning transactions around preventing hot pruning from working.

Do you think it's worth submitting the lock avoidance patch for formal review?

merlin