Skip site navigation (1) Skip section navigation (2)

Geoserver-PostGIS performance problems

From: "Riaan van den Dool" <rvddool(at)csir(dot)co(dot)za>
To: <pgsql-performance(at)postgresql(dot)org>
Subject: Geoserver-PostGIS performance problems
Date: 2012-07-24 07:21:17
Message-ID: 500E690D020000DB000A78CC@pta-emo.csir.co.za (view raw or flat)
Thread:
Lists: pgsql-performance

Hi 


We have noticed something strange in the interaction between our Geoserver instance and Postgres/PostGIS. 


After setting Geoserver's log level to include developer debugging, I managed to capture a single request from Geoserver WMS to PostGIS. 


The (shortened) sequence of events and their timestamps: 


12:31:22,658 - SELECT query for MSG is sent to Postgres 
12:32:10,315 - Rendering for MSG layer starts 
12:32:10,356 - DB Connection Closed 
======== 
~ 48 seconds 


Interestingly enough, when I execute the same query (MSG) directly from PgAdmin3: 


SELECT "frp_mw",encode(ST_AsBinary(ST_Force_2D("the_geom")),'base64') as "the_geom" FROM "public"."af_msg_abba_datetime_today" WHERE ("the_geom" && GeometryFromText('POLYGON ((-27.67968749408379 -46.92207325648429, -27.67968749408379 -6.186892358058866, 75.67968748740275 -6.186892358058866, 75.67968748740275 -46.92207325648429, -27.67968749408379 -46.92207325648429))', 4326) AND (("frp_mw" >= -1 AND "frp_mw" <= 150) OR ("frp_mw" >= 151 AND "frp_mw" <= 300) OR ("frp_mw" >= 301 AND "frp_mw" <= 600) OR ("frp_mw" >= 601 AND "frp_mw" <= 50000))); 


I get 6515 rows in 380 ms. 


Ie Postgres is able to return the results of the query within 380ms if queried from PgAdmin3 but Geoserver takes about 48 seconds to get hold of the same resultset. 


Is this some kind of JDBC problem perhaps? 


Some details about our setup: 


Master Postgres database is on a separate VM from Geoserver, but we replicate to a slave Postgres cluster on the Geoserver VM (same host). So Geoserver is referencing the 'localhost' read-only Postgres cluster for its queries. 


The 380 ms response time shown above was from the slave Postgres cluster, same one that Geoserver is using.   


All Linux (Ubuntu 11.10) based. Postgres 9.1 PostGIS 1.5 Geoserver 2.1.3  


Riaan 






-- 
This message is subject to the CSIR's copyright terms and conditions, e-mail legal notice, and implemented Open Document Format (ODF) standard. 
The full disclaimer details can be found at http://www.csir.co.za/disclaimer.html.

This message has been scanned for viruses and dangerous content by MailScanner, 
and is believed to be clean.

Please consider the environment before printing this email.

Responses

pgsql-performance by date

Next:From: Brett WalkerDate: 2012-07-24 07:54:49
Subject: Re: Geoserver-PostGIS performance problems
Previous:From: Martin FrenchDate: 2012-07-24 06:50:45
Subject: Re: Odd blocking (or massively latent) issue - even with EXPLAIN

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group