xilinx.environment.getcachepath is used to get the path System Generator currently uses to store the simulation cache.
xilinx.environment.setcachepath is used to change the path System Generator uses to store the simulation cache.
When you simulate a Simulink model containing Xilinx IP in System Generator, the Vivado simulator simulation data for that particular IP configuration is cached to speed up the simulation.
System Generator establishes the simulation cache at a default location at startup, and you can determine the current path to the simulation cache with the xilinx.environment.getcachepath command. If you need to change the location of the simulation cache, use the xilinx.environment.setcachepath command. You will need to have write permission on the destination path directory. The new path will apply for the remainder of your System Generator session.
One reason you would use xilinx.environment.setcachepath is to set the path if you do not have write permission on the default directory System Generator uses for caching simulation data.
>> xilinx.environment.getcachepath ans = C:\Users\my_login/AppData/Local/Xilinx/Sysgen/SysgenVivado/win64.o
>> xilinx.environment.setcachepath('C:\sim_cache') ans = C:\sim_cache >> xilinx.environment.getcachepath ans = C:\sim_cache