$ hipcc -O3 -DNDEBUG -march=native -x hip --offload-arch=gfx908 -std=c++20 -o hipfizzbuzz hipfizzbuzz.cpp
Some configurations can be applies while compiling, by setting these variables using -DVARNAME=value:
HIPFIZZBUZZ_VMSPLICE (0/1) (default: 1)
- If 1, use vmsplice() instead of write() to print the output. If the output is not consumed at sufficient rate, it might be corrupted. Disable hwen piping the output to slower programs.
HIPFIZZBUZZ_PRINT_SYNC (0/1) (default: 0)
- Print a buffer directly after computing it instead of swapping buffers. Useful for debugging.
HIPFIZZBUZZ_OVERRIDE_PIPESZ (0/1) (default: 1)
- Override the pipe size. When this is enabled, some programs cannot consume the pipe correctly. Useful to disable for debugging.
HIPFIZZBUZZ_COPY_MEM (0/1) (default: 0)
- Manually copy vram to main memory before printing it, instead of directly printing automatically migrating data.
HIPFIZZBUZZ_DEBUG (0/1) (default: 0)
- Enable "debug mode": This enables HIPFIZZBUZZ_PRINT_SYNC and HIPFIZZBUZZ_COPY_MEM, disables HIPFIZZBUZZ_VMSPLICE and HIPFIZZBUZZ_OVERRIDE_PIPESZ.