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Review the number of DSpace webapps you have installed in Tomcat

By default, DSpace includes a number of web applications which all interact with the underlying DSpace data model. The DSpace web applications include: XMLUI, JSPUI, OAI, RDF, REST, SOLR, SWORD, and SWORDv2. The only required web application is SOLR as it is utilized by several of the other web applications (XMLUI, JSPUI and OAI). See the Installing DSpace documentation for more information about each of these web applications.

Any of the other web applications can be removed from your Tomcat, if you have no plans to utilize that functionality. The fewer web applications you are running, the less memory you will require, as each of these applications will be allocated memory when started up by Tomcat.

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Performance Tuning the Backend (REST API)

Give Tomcat More Memory

Give Tomcat More Java Heap Memory

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Choosing the size of memory spaces allocated to DSpace Backend

psi-probe is a webapp that can be deployed in DSpace and be used to watch memory usage of the other webapps deployed in the same instance of Tomcat (in our case, the DSpace webappsserver webapp).

1. Download the latest version of psi-probe from https://github.com/psi-probe/psi-probe
   

2. Unzip probe.war into [dspace]/webapps/

   Code Block
   cd [dspace]/webapps/ unzip ~/probe-3.1.0.zip unzip probe.war -d probe

   
   

3. Add a Context element in Tomcat's configuration, and make it privileged (so that it can monitor the other webapps):
   EITHER in $CATALINA_HOME/conf/server.xml

   Code Block
   language xml
   <Context docBase="[dspace]/webapps/probe" privileged="true" path="/probe" />

   OR in $CATALINA_HOME/conf/Catalina/localhost/probe.xml

   Code Block
   language xml
   <Context docBase="[dspace]/webapps/probe" privileged="true" />

   
   

4. Edit $CATALINA_HOME/conf/tomcat-users.xml to add a user for logging into psi-probe (see more in https://github.com/psi-probe/psi-probe/wiki/InstallationApacheTomcat)
   

   Code Block
   <?xml version='1.0' encoding='utf-8'?> <tomcat-users> <user username="admin" password="t0psecret" roles="manager" /> </tomcat-users>

   
   

5. Restart Tomcat
6. Open http://yourdspace.com:8080/probe/ (edit domain and port number as necessary) in your browser and use the username and password from tomcat-users.xml to log in.

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Give PostgreSQL Database More Memory

On many linux distros PostgreSQL comes out of the box with an incredibly conservative configuration - it uses only 8Mb of memory! To put some more fire in its belly edit the shared_buffers parameter in postgresql.conf. The memory usage is 8KB multiplied by this value. The advice in the Postgres docs is not to increase it above 1/3 of the memory on your machine.

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