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Userbuffer epic #367

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823adfd
ROCm UserBuffers for Comm Overlap
alextmagro Oct 30, 2025
d779653
Copyrights and cleanup
alextmagro Jan 27, 2026
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25 changes: 14 additions & 11 deletions build_tools/pytorch.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
# This file was modified for portability to AMDGPU
# Copyright (c) 2024-2025, Advanced Micro Devices, Inc. All rights reserved.
# Copyright (c) 2024-2026, Advanced Micro Devices, Inc. All rights reserved.
# Copyright (c) 2022-2025, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
#
# See LICENSE for license information.
Expand Down Expand Up @@ -85,14 +85,6 @@ def setup_pytorch_extension(
if version < (12, 0):
raise RuntimeError("Transformer Engine requires CUDA 12.0 or newer")

if bool(int(os.getenv("NVTE_UB_WITH_MPI", "0"))):
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@wangye805 wangye805 Feb 9, 2026

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Guard via ROCm specifc guards?

assert (
os.getenv("MPI_HOME") is not None
), "MPI_HOME=/path/to/mpi must be set when compiling with NVTE_UB_WITH_MPI=1!"
mpi_path = Path(os.getenv("MPI_HOME"))
include_dirs.append(mpi_path / "include")
cxx_flags.append("-DNVTE_UB_WITH_MPI")

library_dirs = []
libraries = []
if bool(int(os.getenv("NVTE_ENABLE_NVSHMEM", 0))):
Expand All @@ -106,12 +98,22 @@ def setup_pytorch_extension(
cxx_flags.append("-DNVTE_ENABLE_NVSHMEM")

if bool(int(os.getenv("NVTE_ENABLE_ROCSHMEM", 0))):
cxx_flags.append("-DNVTE_ENABLE_ROCSHMEM")
mpi_home = Path(os.getenv("MPI_HOME", "/usr/lib/x86_64-linux-gnu/openmpi"))
include_dirs.append(mpi_home / "include")
library_dirs.append(mpi_home / "lib")
libraries.append("mpi_cxx")
libraries.append("mpi")
cxx_flags.extend(["-DNVTE_ENABLE_ROCSHMEM", "-DOMPI_SKIP_MPICXX"])

extra_link_args = []
if bool(int(os.getenv("NVTE_UB_WITH_MPI", "0"))):
assert (
os.getenv("MPI_HOME") is not None
), "MPI_HOME=/path/to/mpi must be set when compiling with NVTE_UB_WITH_MPI=1!"
mpi_path = Path(os.getenv("MPI_HOME", "/usr/lib/x86_64-linux-gnu/openmpi"))
include_dirs.append(mpi_path / "include")
library_dirs.append(mpi_path / "lib")
libraries.append("mpi")
cxx_flags.extend(["-DNVTE_UB_WITH_MPI", "-DOMPI_SKIP_MPICXX"])

# Construct PyTorch CUDA extension
sources = [str(path) for path in sources]
Expand All @@ -125,4 +127,5 @@ def setup_pytorch_extension(
extra_compile_args={"cxx": cxx_flags},
libraries=[str(lib) for lib in libraries],
library_dirs=[str(lib_dir) for lib_dir in library_dirs],
extra_link_args=[str(arg) for arg in extra_link_args],
)
2 changes: 2 additions & 0 deletions ci/pytorch.sh
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Expand Up @@ -89,6 +89,8 @@ run_test_config_mgpu(){
configure_omp_threads 8
run_default_fa 1 test_fused_optimizer.py
run_default_fa 3 test_sanity_import.py
run_default_fa 3 distributed/test_fusible_ops_with_userbuffers.py
run_default_fa 3 distributed/test_comm_gemm_overlap.py
run_default_fa 2 distributed/test_fusible_ops.py
run_default_fa 2 distributed/test_numerics.py
run_default_fa 1 distributed/test_torch_fsdp2.py
Expand Down
4 changes: 2 additions & 2 deletions examples/pytorch/comm_gemm_overlap/te_layer_with_overlap.py
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Expand Up @@ -68,7 +68,7 @@ def _parse_args(argv=None, namespace=None):
)
parser.add_argument("--seed", type=int, default=1234, help="RNG seed.")
parser.add_argument(
"--fp8", action="store_true", default=False, help="Enables the te.fp8_autocast() context."
"--fp8", action="store_true", default=False, help="Enables the te.autocast() context."
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@wangye805 wangye805 Feb 9, 2026

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Up to TE v2.8, I think it's still fp8_autocast. Were you targeting at higher versions?

)
parser.add_argument(
"--no-comm-overlap",
Expand Down Expand Up @@ -299,7 +299,7 @@ def dist_print(msg, end="\n", group=nccl_world, src=0, debug=False, error=False)

dist_print(" |-- Forward pass", group=tp_group, debug=True)
with torch.amp.autocast("cuda", dtype=torch.bfloat16):
with te.fp8_autocast(enabled=opts.fp8, fp8_recipe=fp8_recipe, fp8_group=nccl_world):
with te.autocast(enabled=opts.fp8, recipe=fp8_recipe, amax_reduction_group=nccl_world):
y = model(x)
if isinstance(y, tuple):
out, *_ = y
Expand Down
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