56fd68e7dd
CCCL (CUDA C++ Core Libraries) provides: - CUB: device/block/warp-level GPU primitives (reduce, scan, sort, topk) - Thrust: high-level parallel algorithms (transform_reduce, sort, scan) - libcudacxx: CUDA C++ standard library (atomics, barriers, memory) - cudax: experimental features (memory resources, allocators) - Tuning policies: per-SM hardware-specific algorithm parameters Competition optimization vectors mapped to CCCL: - Output TPS (83% weight): warp_reduce, block_reduce, device_topk - Input TPS (14% weight): device_scan, block_load, prefetch - Cache TPS (3% weight): prefix caching strategy patterns - Memory (0.9 util): pooled/cached/buddy allocators Source: https://github.com/NVIDIA/cccl (shallow clone, HEAD only) License: Apache-2.0
NVRTCC
How to use:
Configure libcudacxx to test with NVRTC and cmake --build the project before executing lit.
cmake ... -DLIBCUDACXX_TEST_WITH_NVRTC=ON
cmake --build $BUILD_DIR
lit ... $TEST_DIR
How it works
nvrtcc processes incoming arguments matching for flags that modify its behavior, and passes the rest to NVRTC.
It will hopefully filter any that don't apply (gcc warnings and such).
The input file is processed to be compatible with NVRTC similarly to the nvrtc.sh scripts during compilation.
The resulting file is then compiled with NVRTC and stored as a fatbin. This is, in effect, a compilation pass for NVRTC.
.fail.cpp tests will be analyzable by lit and should work properly.
For execution, the fatbin file is provided to nvrtcc again, but will instead launch the precompiled test unit on the GPU.
flowchart TD;
compile{nvrtcc};
runfat{nvrtcc};
start[Execute lit]
build(Execute nvrtcc)
pass(Pass: Continue)
fail(Fail: Compile time failure)
save[Save fatbin]
load[Load fatbin]
testpass[Pass: No failures]
testfail[Fail: Report driver error]
save --> load;
subgraph Build Pass
start -- lit -sv -Denable_nvrtc=true --> build;
build -- nvrtcc -x cu test.pass.cpp ... --> compile;
compile --> fail;
compile --> pass;
pass --> save;
end
subgraph Test Pass
load -- nvrtcc test.pass.cpp.fatbin --> runfat;
runfat --> testpass
runfat --> testfail
end