# 8.6. Simulation¶

Simulation is a important regression and development tool for RTEMS. Developers use simulation to work on core parts of RTEMS as it provides excellent debugging supporting. Simulation run via the RTEMS Tester allows a test to run on each core of your testing host machine lower the time to run all tests.

RTEMS Tester Simulation

The RTEMS Tester Simulation figure shows the structure of RTEMS Testing using simulation. The executables are built and the rtems-test command is run from the top of the build directory. The RTEMS Tester executes the BSP specific simulator for each test capturing the output