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Here are the recommended hardware and memory requirements for your in-house frevvo server.

Hardware Requirements

The minimum recommended hardware configuration for your Live Forms server is:

  • 2 gigahertz (GHz) 64-bit (x64) processor with 4 cores
  • 5 gigabyte (GB) of system memory
  • 100 GB hard drive

However you must size your hardware platform to your specific form usage characteristics. As the number of concurrent users and forms/flows increases so must the system memory. For a medium use production server consider increasing the JVM RAM allocation to 6 or 8 gigabytes. Refer to the memory configuration topic below.

 On This Page:

Memory Configuration

The frevvo Tomcat bundle comes pre-configured with default memory usage settings. While the defaults are sufficient for initial usage, as your forms, business logic and submissions grow, so will the memory needs of the frevvo  server.

The first important step is to ensure that frevvo is installed on a machine with sufficient cpu and ram. "Sufficient" depends on your frevvo usage (number of users, number of forms/flows in use, number of submissions per day, etc..).

After making memory configuration changes you must restart the frevvo server.

You will know when you need to increase allocated memory when you see two common errors appear in the Tomcat logfiles <frevvo-home>//tomcat/logs. You can tune the frevvo/tomcat installation by editing <frevvo-home>/tomcat/bin/setenv.bat on windows and on unix.

You'll see something like this in setenv.[bat,sh]:

set JAVA_OPTS=-Xms128m -Xmx512m -Djava.awt.headless=true -Dfrevvo.users.path="%CATALINA_HOME%\..\data\users"

Live Forms as a Windows service

If you are running frevvo as a Windows service, you will have to edit frevvo/tomcat/bin/service.bat line to increase the Java Heap and Permgen spaces. Here is an example of the line you need to edit in that file:

"%EXECUTABLE%" //US//%SERVICE_NAME% ++JvmOptions "-XX:MaxPermSize=156m;-XX:+UseConcMarkSweepGC;-XX:+CMSClassUnloadingEnabled;\temp;-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager;-Djava.util.logging.config.file=%CATALINA_BASE%\conf\;-Dfile.encoding=UTF-8;-Djava.awt.headless=true" --JvmMs 256 --JvmMx 1024

See the documentation on Tomcat Windows Service for more details.

After making these modifications to the service.bat file, you must Remove/Reinstall Live Forms as a Windows service for the changes to take effect.

Insight Server Memory Settings

By default, the <frevvo-home>\solr-5.4.1\bin\solr script,sets the maximum Java heap size to 512M (-Xmx512m). This may not be sufficient especially when reporting on/indexing a large number of submissions. It may cause "out of memory" exceptions in the  <frevvo-home>solr-5.4.1\server\logs\solr.log file. The JVM heap size can be increased to resolve this. Make sure that the machine where the Insight Server is installed has enough memory to accommodate your changes.

Follow these steps:

  1. Stop the Insight Server.
  2. Uncomment the set SOLR_JAVA_MEM statement in the OS specific* file (cmd for windows, sh for linux).
  3. Change the values.
    For example, to increase the max heap size to 1G use: -Xms512m –Xmx1g. For *nix OS, make sure SOLR_HEAP is commented out.
  4. Restart the Insight Server.
REM Increase Java Min/Max Heap as needed to support your indexing / query needs
set SOLR_JAVA_MEM=-Xms512m -Xmx512m



Solutions for memory errors are discussed below. 

Out of Memory Errors in frevvo.log

If you see "Out of Memory" errors in the <frevvo-home>\tomcat\logs\frevvo.log, implement the solutions listed here:

OutOfMemoryError: Java heap space

SEVERE: Servlet.service() for servlet jsp threw exception
java.lang.OutOfMemoryError: Java heap space

To solve this edit setenv.[bat,sh] (or service.bat if you are running Live Forms as a Windows service) to increase the minimum and maximum heap size via the parameters: -Xmx and -Xms.

For example: -Xms512m to -Xmx1g. Make sure also that the machine where frevvo is installed has enough memory installed. If you change -Xmx to 1g your machine will need more then 1g ram

Out of Memory Errors in the Insight Server log:

The insight server has its own log file under <frevvo-home>solr-5.4.1\server\logs. If you see an Out of Memory exception in this log, review Insight Server Memory Settings to change the Insight Server heap size.

This is independent of frevvo which has its own log and its own heap size.

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