dylanyunlon
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8dc6462a2b
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feat: CCCL CachingDeviceAllocator LD_PRELOAD — bypass CoreX expandable_segments ASSERT
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
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2026-08-13 09:53:42 +00:00 |
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dylanyunlon
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ddfd24da27
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fix: sync to real-machine verified version — ALL TESTS PASSED
真机验证通过的精确版本:
- CUB_NS_QUALIFIER (不是 cub::)
- thread_local inside_cub reentrant guard
- 去掉 -D_CCCL_COMPILER_GCC=1
- total_mem → total_memory
BI-V100 32GB × Iluvatar, CoreX clang++ 编译 51864 bytes .so
expandable_segments:True 被 strip, CUB allocator 接管, 缓存复用确认
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2026-08-13 09:52:15 +00:00 |
|
dylanyunlon
|
967d572073
|
feat: CCCL CachingDeviceAllocator LD_PRELOAD — bypass CoreX expandable_segments ASSERT
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
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2026-08-13 09:26:41 +00:00 |
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