Memory Management

Depending on the user's project, test generation may require a significant amount of memory. Diffblue recommends running dcover on a system with either 8GB or 16GB of RAM, as the maximum amount of memory dcover uses is limited to a quarter of the available RAM by default.

Alternately, if you are getting out of memory errors, you can increase the amount of memory dcover has access to by specifying the JVM_ARGS environment variable. All the default Java options documented at: https://docs.oracle.com/javase/8/docs/technotes/tools/windows/java.html can be added to this variable. For example, if you run on a machine with 4GB of RAM then the default maximum Java heap size would be 1GB. The examples below show how to increase the maximum Java heap size from 1GB to 2GB in that case.

Windows

Example:

set JVM_ARGS=-Xmx2g
dcover create

Linux/macOS

Example:

export JVM_ARGS=-Xmx2g
dcover create

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