3 Commits

Author SHA1 Message Date
dylanyunlon
8dc6462a2b 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
2026-08-13 09:53:42 +00:00
dylanyunlon
ddfd24da27 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
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
2026-08-13 09:26:41 +00:00