Commit Graph

2 Commits

Author SHA1 Message Date
dylanyunlon
e1cdbfc167 feat: CCCL CachingDeviceAllocator preload — 完整依赖链 288 files
从 cccl_upstream 递归追踪 cub/util_allocator.cuh 的全部 include 依赖:
  cub/         9 files (config, util_*, version, detect_cuda_runtime)
  cuda/        libcudacxx type_traits, concepts, algorithm, iterator...
  nv/          target macros, preprocessor

总计 288 个头文件 (1.4MB),打包到 include/ 目录,编译时 -I include
即可完全脱离 CCCL 原始目录结构。

.cu 文件直接 #include <cub/util_allocator.cuh>,
走原版 CUB CachingDeviceAllocator,零 mock。

BI-V100 参数: growth=2 bins=[8..32] max_cached=8GB/device
2026-08-13 09:30:44 +00:00
dylanyunlon
8eba8df925 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 09:30:43 +00:00