SUNScholar/Optimisations

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Introduction

This wiki page details the major optimisations of the system performed at Stellenbosch University in order to create a truly production optimised version of DSpace.

Java

Setup custom java environment parameters. See link below. 

http://wiki.lib.sun.ac.za/index.php/SUNScholar/Prepare_Ubuntu/S08

Perform Java profiling to find memory and CPU intensive code.

Information

Tools

Tomcat

See: http://www.turnkeylinux.org/tomcat

  • Remove "mod_jk", use "authbind" exclusively with no need of the Tomcat AJP connector in order to reduce the CPU and memory load
http://wiki.lib.sun.ac.za/index.php/SUNScholar/Prepare_Ubuntu/S05
  • Remove "development mode" of Tomcat by adding the following to the server context in order to reduce DNS lookups.
enableLookups="false"

Reduce system log sizes

Click on the heading above.

Email error logs

Click on the heading above

XMLUI

  • Use XMLUI exclusively to reduce the memory load.
http://wiki.lib.sun.ac.za/index.php/SUNScholar/Install_DSpace/S08

Database

  • Fix "browse index" configuration to reduce the PostgreSQL database server query load.
http://wiki.lib.sun.ac.za/index.php/SUNScholar/Indexes#Browse_Indexes

Vacumn the database regularly 

http://wiki.lib.sun.ac.za/index.php/SUNScholar/Daily_Admin#.22postgres.22_crontab

Bitstream checker

Modified bitstream checker settings as follows to reduce database size. 

#### Checksum Checker Settings ####
# Default dispatcher in case none specified
plugin.single.org.dspace.checker.BitstreamDispatcher=org.dspace.checker.SimpleDispatcher

# check history retention
checker.retention.default=1y
checker.retention.CHECKSUM_MATCH=2w
References

Monit monitor service

In case the Tomcat service halts or hangs due to whatever... , I installed monit to restart the service and then alert me. See an example of my config below. 

dspace@ir1:/etc/monit$ sudo cat /etc/monit/monitrc
set daemon  60
set logfile syslog facility log_daemon
set mailserver localhost
set mail-format { from: XXXX@XX.XXX.XX.XX }
set alert XXXX@localhost
set httpd port 2812
     allow %user%:%password%

check process sshd with pidfile /var/run/sshd.pid
   start program  "/etc/init.d/ssh start"
   stop program  "/etc/init.d/ssh stop"
   if failed port 22 protocol ssh then restart
   
check host sunscholar with address scholar.sun.ac.za
   start program = "/etc/init.d/tomcat6 restart"
   stop program  = "/etc/init.d/tomcat6 stop"
   if failed port 80 proto http then restart
   alert XXXX@XXX.XX.XX
   alert XXXX@XXX.XX.XX

All confidential information has been replaced with % signs or captial X's.

References

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