Runtime Compilation

Runtime compilation

rocFFT includes many kernels for common FFT problems. Some plans may require additional kernels aside from what is built in to the library. In these cases, rocFFT will compile optimized kernels for the plan when the plan is created.

Compiled kernels are stored in memory by default and will be reused if they are required again for plans in the same process.

If the ROCFFT_RTC_CACHE_PATH environment variable is set to a writable file location, rocFFT will write compiled kernels to this location. rocFFT will read kernels from this location for plans in other processes that need runtime-compiled kernels. rocFFT will create the specified file if it does not already exist.