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Re: Pooling in Core WAS: Need help in performance tuning.

From: Rajesh Kumar Mallah <mallah(dot)rajesh(at)gmail(dot)com>
To: Greg Smith <greg(at)2ndquadrant(dot)com>
Cc: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Matthew Wakeling <matthew(at)flymine(dot)org>, Craig Ringer <craig(at)postnewspapers(dot)com(dot)au>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Pooling in Core WAS: Need help in performance tuning.
Date: 2010-07-18 18:36:24
Message-ID: AANLkTimvb3_r6cMXtCsPPnXx0aTsTmiebRQyL6tSlppu@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
Looks like ,

pgbench cannot be used for testing with pgbouncer if number of
pgbench clients exceeds pool_size + reserve_pool_size of pgbouncer.
pgbench keeps waiting doing nothing. I am using pgbench  of postgresql 8.1.
Are there changes to pgbench in this aspect ?

regds
Rajesh Kumar Mallah.

On Sun, Jul 18, 2010 at 11:38 PM, Rajesh Kumar Mallah <
mallah(dot)rajesh(at)gmail(dot)com> wrote:

>
>
> On Sun, Jul 18, 2010 at 10:55 PM, Greg Smith <greg(at)2ndquadrant(dot)com> wrote:
>
>> Rajesh Kumar Mallah wrote:
>>
>>> the no of clients was 10 ( -c 10)  carrying out 10000 transactions each
>>> (-t 10000) .
>>> pgbench db was initilised with scaling  factor -s 100.
>>>
>>> since client count was less there was no queuing of requests in pgbouncer
>>> i would prefer to say  it was in 'passthrough' mode.
>>>
>>
>> Of course pgbouncer is going decrease performance in this situation.
>>  You've added a whole layer to things that all traffic has to pass through,
>> without a setup that gains any benefit from the connection pooling.  Try
>> making the client count 1000 instead if you want a useful test.
>>
>
> Dear Greg,
>
> my  max_client is 300 shall i test  with client count 250 ?
> if so what should be the scaling factor while initializing
> the pgbench db?
>
>
>> --
>> Greg Smith  2ndQuadrant US  Baltimore, MD
>> PostgreSQL Training, Services and Support
>> greg(at)2ndQuadrant(dot)com   www.2ndQuadrant.us
>>
>>
>

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Next:From: Scott CareyDate: 2010-07-18 19:00:11
Subject: Re: Pooling in Core WAS: Need help in performance tuning.
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