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These environment variables are relevant for the Genero Report Engine (GRE).
The GREDIR environment variable specifies the location of the Genero Report Engine (GRE) installation directory.
The GREOUTPUTDIR environment variable specifies the directory where all writing operations that would otherwise be performed in the current working directory of the Genero Report Engine (GRE) will be performed.
The value can be an absolute or a relative file path. If the value is a relative file path, then it is internally prepended with the current working directory of GRE. When set, all writing operations that would otherwise be performed in the current working directory of GRE will be performed in the specified directory.
Examples include relative path specification in the functions fgl_report_setOutputFileName(), fgl_report_configureImageDevice() (the filePath parameter), fgl_report_setBrowserDocumentDirectory(), fgl_report_setBrowserFontDirectory() and the location of the GRE debug files (jdebug0.xml, jdebug1.xml, and so on.)
The GRE_MAX_CONCURRENT_JOBS environment variable limits the number of worker threads in distributed mode.
By default, the Genero Report Engine runs 25 concurrent threads. As such, by default it can process no more than 25 concurrent jobs. Jobs that a started at a point in time when the maximum value has been reached are queued until another job completes. The limit on concurrent threads is to prevent memory exhaustion in times of critical load.
GRE_MAX_CONCURRENT_JOBS allows the modification of the number of concurrent threads. This variable takes an integer.