Add support for improved fault tolerance: non-blocking mode, new
init function with config, and ncclCommFinalize function.
Reintroduce collnet+chain algorithm, alongside collnet+direct.
Add LL protocol for intra-node P2P (on by default) and network
communication (off by default).
Use network instead of shared memory when performance is better.
Fix: wait for CUDA graph destroy before destroying comm with linked
graph resources.
Remove aggressive polling during enqueue.
Fix DMABUF fallback on MOFED 5.4 and earlier.
Summary: NCCL_DEBUG_FILE does not work properly since the recent v2.13.4 updates (https://github.com/NVIDIA/nccl/pull/682) because it nows sets `ncclDebugLevel` after parse `NCCL_DEBUG_FILE`. This patch move parsing `tempNcclDebugLevel` before processing `NCCL_DEBUG_FILE` to ensure `NCCL_DEBUG_FILE` is parsed only when `NCCL_DEBUG > NCCL_LOG_VERSION` (same as previous behavior)
Differential Revision: D38415208
fbshipit-source-id: 5689bbb798e73efb9e8594557666987f07e89a30
add support for intercepting SIGUSR2 in RCCL. This signal will
not terminate the execution of the application, but print the stacktrace
of the process that the signal was sent to instead.
Optimize CUDA graph launch; avoid launching a CPU callback for
intra-node operations.
Simplify kernel common code to improve the latency of send/recv
operations.
Strengthen CUDA streams semantics.
Change NET API to v6, to add dmabuf support.
Add ncclGetLastError() function.
Add ncclRemoteError code and use it for remote network errors.
Support the use of a different NCCL_NET parameter per communicator.
Add support for SHM and P2P transfers using cudaMemcpy.
* Reduce AlltoAll port usage when connecting proxy
Reuse socket ports when connecting proxies in AlltoAll.
Existing port usage in AlltoAll is O(n) for recv and O(n) for send,
reusing socket ports in server or client side will make one of them
O(1), reusing both will reduce the total port usage to O(1) and enables
AlltoAll in >64 MI200 nodes.
* Update changelog accordingly
Update changelog accordingly.
This is a single commit of the source code changes required to
introduce support for multiple ranks per device.
A new interface (ncclCommRankInitMulti) has to be used to make use of
this new feature.
Improve allreduce performance when we have more than one network interface per
GPU and we need to use PXN to close rings.
Add support for PCI Gen5 on 5.4 kernels.
Fix crash when setting NCCL_SET_THREAD_NAME.
Fix random crash in init due to uninitialized struct.
Fix hang on cubemesh topologies.
Add P2P_DIRECT_DISABLE parameter to disable direct access to pointers within a
process.
Fix bug with CollNet
Fix bug with zero-bytes send/recv operations
Fix NCCL_PARAM implementation to avoid taking a lock on every call
Fix bug when setting NCCL_IB_QPS_PER_CONNECTION to more than one.
Improve error reporting for network errors.
Sylvain Jeaugey
Ching-Hsiang Chu
Wenkai Du
Ziyue Yang
akolliasAMD
Hubert Lu
Edgar Gabriel
hubertlu-tw
Yifan Xiong
gilbertlee-amd
Aristotelis
Wenkai Du
Colin Smith