Gahow Wang
e27df50ca9
New crate xtrain-distributed (mirrors xserv-distributed): hand-written NCCL
FFI (GetUniqueId / CommInitRank / AllReduce / CommDestroy / Group{Start,End},
ncclUniqueId passed by value per the NCCL ABI) and a safe DdpContext wrapper —
rank 0 mints the UniqueId, every rank inits its communicator under a group, and
all_reduce_average_grads in-place AllReduce(sum)s each param's .grad() device
buffer then scales by 1/world (reuses T7's scale_inplace kernel). AllReduce runs
on the null stream so it orders with the model's kernels (no extra barrier).
build.rs follows the per-crate convention: no nvcc -> no_cuda cfg (crate
compiles to empty, cargo check passes host-side); with nvcc, links -lnccl
-lcudart like xserv-distributed's build.rs.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
11 lines
267 B
TOML
11 lines
267 B
TOML
[package]
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name = "xtrain-distributed"
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version.workspace = true
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edition.workspace = true
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license.workspace = true
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[dependencies]
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xtrain-cuda = { path = "../xtrain-cuda" }
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xtrain-tensor = { path = "../xtrain-tensor" }
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xtrain-autodiff = { path = "../xtrain-autodiff" }
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