Due to a problem in the Intel® Quartus® Prime Software versions 18.0 and 18.1, a large trace file called iossm_bf_cpu_cpu.tr is generated when you simulate a design containing the Intel Stratix® 10 DDR4 IP.
To disable the generation of the iossm_bf_cpu_cpu.tr file, download and install the Intel® Quartus® Prime Software version 18.1 patch 0.21.
> Download the Readme (.txt) for the version 18.1 patch 0.21
> Download the version 18.1 patch 0.21 for Windows (.exe)
> Download the version 18.1 patch 0.21 for Linux (.run)