Performance tuning
The tx_install_dirconfig.yaml file contains the runtime/stream/MaxMemLimit property and the runtime/stream/MaxMemDirectory property. When data passed to or from an adapter exceeds the size (in MB) that is configured on the StreamMaxMemLimit property, the data is paged to a temporary file to limit the memory consumption of the process. The StreamMaxMemDirectory property specifies the directory where the temporary files are located.
Configure these properties in conjunction with the threshold for running maps in separate Java™ Virtual Machines (JVMs).