Fig. 6.

Usage of process blocks. The process block logFiles defined in Fig. 5 is used to generate several subtasks (line 1). These subtasks create compressed versions of the log-files stored in /tmp/. In this case, at most two subtasks are allowed to run simultaneously. Additional file 2 describes how process block variables can be accessed. Here, the placeholder {} is replaced by the variable values stored in the process block, i.e. the complete file paths, and [1] is replaced with the file names (without the ‘.log’ file-ending) (lines 3-4)