Re: Performance under contention

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От Ivan Voras
Тема Re: Performance under contention
Дата
Msg-id ice2pd$ae8$1@dough.gmane.org
обсуждение исходный текст
Ответ на Re: Performance under contention  ("Kevin Grittner")
Ответы Re: Performance under contention  (Craig Ringer)
Список pgsql-performance
Дерево обсуждения
Performance under contention  (Ivan Voras, )
 Re: Performance under contention  ("Kevin Grittner", )
  Re: Performance under contention  (Ivan Voras, )
   Re: Performance under contention  (Jignesh Shah, )
    Re: Performance under contention  (Omar Kilani, )
   Re: Performance under contention  ("Kevin Grittner", )
    Re: Performance under contention  (Ivan Voras, )
     Re: Performance under contention  (Craig Ringer, )
      Re: Performance under contention  (Ivan Voras, )
      Re: Performance under contention  (Vitalii Tymchyshyn, )
       Re: Performance under contention  ("Kevin Grittner", )
 Re: Performance under contention  ("Kevin Grittner", )
  Re: Performance under contention  (Ivan Voras, )
 Re: Performance under contention  (Greg Smith, )
  Re: Performance under contention  (Ivan Voras, )
 Re: Performance under contention  (Robert Haas, )
  Re: Performance under contention  (Robert Haas, )
  Re: Performance under contention  (Jignesh Shah, )
   Re: Performance under contention  (Jignesh Shah, )
   Re: Performance under contention  (Robert Haas, )
    Re: Performance under contention  (Tom Lane, )
     Re: Performance under contention  (Dave Crooke, )
     Re: Performance under contention  (Robert Haas, )
    Re: Performance under contention  (Ivan Voras, )
     Re: Performance under contention  (Robert Haas, )
      Re: Performance under contention  (Ivan Voras, )
      Re: Performance under contention  (Віталій Тимчишин, )
       Re: Performance under contention  (Ivan Voras, )
       Re: Performance under contention  (Robert Haas, )
        Re: Performance under contention  (Robert Haas, )
         Re: Performance under contention  (Tom Lane, )
          Re: Performance under contention  (Robert Haas, )
           Re: Performance under contention  (Tom Lane, )
            Re: Performance under contention  (Robert Haas, ) 
On 11/22/10 16:26, Kevin Grittner wrote:
> Ivan Voras<>  wrote:
>> On 11/22/10 02:47, Kevin Grittner wrote:
>>> Ivan Voras  wrote:
>>>
>>>> After 16 clients (which is still good since there are only 12
>>>> "real" cores in the system), the performance drops sharply
>>>
>>> Yet another data point to confirm the importance of connection
>>> pooling.  :-)
>>
>> I agree, connection pooling will get rid of the symptom. But not
>> the underlying problem. I'm not saying that having 1000s of
>> connections to the database is a particularly good design, only
>> that there shouldn't be a sharp decline in performance when it
>> does happen. Ideally, the performance should remain the same as it
>> was at its peek.
>
> Well, I suggested that we add an admission control[1] mechanism,

It looks like a hack (and one which is already implemented by connection
pool software); the underlying problem should be addressed.

But on the other hand if it's affecting so many people, maybe a warning
comment in postgresql.conf around max_connections would be helpful.

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