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The size of the ide.log file is checked during the start of the IDE and if it is larger then a limit the file is renamed and configured number of old files is hold for some time. This does not work in case of excessive logging during the running IDE. In issue 29802 user reported ide.log file of size 96MB! This should not happen. The size of the file should be checked during the writing into the file. The excessive logging is not good, but platform should manage it correctly.
Be certain that a large log file is preferred ofer lots of little log files. Much faster to delete (at least on windows) 1 giant log file than 2 1/2 giant log files :D Of course I assume at some point you start deleting old logs?