Re: Hardware suggestions for maximum read performance

From: Julien Cigar
Subject: Re: Hardware suggestions for maximum read performance
Date: ,
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In response to: Hardware suggestions for maximum read performance  (Mike McCann)
List: pgsql-performance

On 05/03/2013 01:11, Mike McCann wrote:


We are in the fortunate situation of having more money than time to help solve our PostgreSQL 9.1 performance problem.

Our server hosts databases that are about 1 GB in size with the largest tables having order 10 million 20-byte indexed records. The data are loaded once and then read from a web app and other client programs.  Some of the queries execute ORDER BY on the results. There are typically less than a dozen read-only concurrent connections to any one database.

I would first check the spurious queries .. 10 millions rows isn't that huge. Perhaps you could paste your queries and an explain analyze of them ..? You could also log slow queries and use the auto_explain module

SELECTs for data are taking 10s of seconds. We'd like to reduce this to web app acceptable response times (less than 1 second). If this is successful then the size of the database will grow by a factor of ten - we will still want sub-second response times.  We are in the process of going through the excellent suggestions in the "PostgreSQL 9.0 High Performance" book to identify the bottleneck (we have reasonable suspicions that we are I/O bound), but would also like to place an order soon for the dedicated server which will host the production databases. Here are the specs of a server that we are considering with a budget of $13k US:

HP ProLiant DL360p Gen 8
Dual Intel Xeon 2.4GHz 4-core E5-2609 CPUs
2x146GB 15K SAS hard drives
+ the usual accessories (optical drive, rail kit, dual power supplies)


Thanks in advance for any suggestions you have.


Mike McCann
Software Engineer
Monterey Bay Aquarium Research Institute
7700 Sandholdt Road
Moss Landing, CA 95039-9644
Voice: 831.775.1769  Fax: 831.775.1736

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From: Julien Cigar
Subject: Re: Hardware suggestions for maximum read performance
From: Anne Rosset
Subject: Re: Deterioration in performance when query executed in multi threads