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Re: Write workload is causing severe slowdown in Production

From: "Tomas Vondra" <tv(at)fuzzy(dot)cz>
To: gnanam(at)zoniac(dot)com
Cc: "'Tomas Vondra'" <tv(at)fuzzy(dot)cz>, "'Vitalii Tymchyshyn'" <tivv00(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Write workload is causing severe slowdown in Production
Date: 2012-03-22 12:55:28
Message-ID: c98cd98d6fc0f1c0325a05ad5b98fbb0.squirrel@sq.gransy.com (view raw or flat)
Thread:
Lists: pgsql-performance
On 22 Březen 2012, 13:10, Gnanakumar wrote:
>> So, what else is running on the system? Because if there's 35GB RAM and
>> the shared buffers are 1.5GB, then there's about 33GB for page cache.
>> Something like 16GB would be a conservative setting.
>
> Yes, you guessed it right.  Both Web server and DB server are running in
> the same machine.
>
>> I'm not saying this will fix the issues, but maybe it shows that
>> something
>> else is running on the box and maybe that's the culprit, not PostgreSQL?
>
> Based on my observations and analysis, I'm sure that database write
> operation "is" causing the slowdown, but not because of other applications
> running in the same server.

You haven't provided any clear evidence for such statement so far. Let's
wait for the vmstat/iostat logs etc.

Tomas


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