8eba8df925
从 CCCL upstream cub/cub/util_allocator.cuh 提取 CachingDeviceAllocator
核心算法，去掉所有 CUB/CCCL 宏依赖，编译为独立 .so。
用 LD_PRELOAD 拦截 cudaMalloc/cudaFree，路由到 CUB 的 geometric-bin
缓存分配器。同时在 constructor 中 strip PYTORCH_CUDA_ALLOC_CONF 里的
expandable_segments 配置，避免 CoreX CUDACachingAllocator.cpp:545 ASSERT。
BI-V100 调优参数:
bin_growth=8, min_bin=3 (512B), max_bin=13 (~550MB)
max_cached_bytes=4GB per device (32GB卡的合理上限)
真机测试步骤:
1. bash build_cccl_preload.sh
2. LD_PRELOAD=./libcccl_allocator.so CCCL_ALLOC_DEBUG=1 \
PYTORCH_CUDA_ALLOC_CONF=expandable_segments:True \
python3 verify_preload.py
113 lines
3.1 KiB
Bash
Executable File
113 lines
3.1 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Build libcccl_allocator.so — LD_PRELOAD .so for CUB CachingDeviceAllocator
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#
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# Usage:
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# bash build_cccl_preload.sh [output_dir]
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#
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# On BI-V100 with CoreX SDK:
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# bash build_cccl_preload.sh /workspace/qwen3_6_scripts/cccl_preload
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#
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# The .so intercepts cudaMalloc/cudaFree and routes through CUB's
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# caching allocator, bypassing CoreX's "expandable segment not supported"
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# ASSERT in CUDACachingAllocator.cpp:545.
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set -euo pipefail
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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OUTPUT_DIR="${1:-${SCRIPT_DIR}}"
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SRC="${SCRIPT_DIR}/cccl_allocator_preload.cu"
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OUT="${OUTPUT_DIR}/libcccl_allocator.so"
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# Find CoreX clang++ (preferred) or system g++
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if [[ -x /usr/local/corex-3.2.3/bin/clang++ ]]; then
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CXX=/usr/local/corex-3.2.3/bin/clang++
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echo "[build] Using CoreX clang++: ${CXX}"
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elif [[ -x /usr/local/corex/bin/clang++ ]]; then
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CXX=/usr/local/corex/bin/clang++
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echo "[build] Using CoreX clang++ (alt): ${CXX}"
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else
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CXX=g++
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echo "[build] CoreX clang++ not found, falling back to g++"
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fi
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# Find CUDA include path
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CUDA_INC=""
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for candidate in \
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/usr/local/corex/include \
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/usr/local/cuda/include \
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/usr/local/corex/lib64/clang/16/include \
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; do
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if [[ -f "${candidate}/cuda_runtime_api.h" ]]; then
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CUDA_INC="${candidate}"
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break
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fi
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done
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# Find CUDA lib path for linking
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CUDA_LIB=""
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for candidate in \
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/usr/local/corex/lib64 \
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/usr/local/cuda/lib64 \
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; do
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if [[ -f "${candidate}/libcudart.so" ]]; then
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CUDA_LIB="${candidate}"
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break
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fi
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done
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if [[ -z "${CUDA_INC}" ]]; then
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echo "[WARN] cuda_runtime_api.h not found — trying compile anyway"
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fi
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echo "[build] CUDA include: ${CUDA_INC:-system}"
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echo "[build] CUDA lib: ${CUDA_LIB:-system}"
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echo "[build] Source: ${SRC}"
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echo "[build] Output: ${OUT}"
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# Build as shared library
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# -x cuda or -x c++ depending on compiler
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if [[ "${CXX}" == *clang++* ]]; then
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# CoreX clang++ can compile .cu natively
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${CXX} \
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-shared -fPIC \
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-O2 \
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${CUDA_INC:+-I"${CUDA_INC}"} \
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${CUDA_LIB:+-L"${CUDA_LIB}"} \
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-lcudart \
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-ldl \
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-std=c++17 \
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-o "${OUT}" \
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"${SRC}"
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else
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# g++ needs .cu renamed or treated as C++
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# cuda_runtime_api.h should still work with host compiler
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${CXX} \
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-shared -fPIC \
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-O2 \
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${CUDA_INC:+-I"${CUDA_INC}"} \
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${CUDA_LIB:+-L"${CUDA_LIB}"} \
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-lcudart \
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-ldl \
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-std=c++17 \
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-x c++ \
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-o "${OUT}" \
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"${SRC}"
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fi
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if [[ -f "${OUT}" ]]; then
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SIZE=$(stat -c%s "${OUT}" 2>/dev/null || stat -f%z "${OUT}" 2>/dev/null || echo "?")
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echo "[build] SUCCESS: ${OUT} (${SIZE} bytes)"
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echo ""
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echo "Usage:"
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echo " LD_PRELOAD=${OUT} CCCL_ALLOC_DEBUG=1 python3 -c 'import torch; t=torch.zeros(1024, device=\"cuda\")'"
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echo ""
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echo "In computility-run.yaml, add to env:"
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echo " - name: LD_PRELOAD"
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echo " value: /workspace/qwen3_6_scripts/cccl_preload/libcccl_allocator.so"
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echo " - name: PYTORCH_CUDA_ALLOC_CONF"
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echo " value: expandable_segments:True"
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else
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echo "[build] FAILED"
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exit 1
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fi
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