# stressapptest > Userspace memory and IO test. > More information: . - Test the given amount of memory (in Megabytes): `stressapptest -M {{memory}}` - Test memory as well as I/O for the given file: `stressapptest -M {{memory}} -f {{path/to/file}}` - Test specifying the verbosity level, where 0=lowest, 20=highest, 8=default: `stressapptest -M {{memory}} -v {{level}}`