Dumping only last 1ms log file information in irun/xrun

Hi,

To manage log file size. I would like to dump out the log information for only last 1ms. Is there a way to do that in irun/xrun tcl input script?

There are are lot of test cases and the time duration for  each test case is different , so there is no way of knowing the duration of the test before the simulation begins.

Thanks,