mirror of https://github.com/NVIDIA/nccl.git
20 Commits
| Author | SHA1 | Message | Date |
|---|---|---|---|
Kamil Iskra
|
7c12c627c6 |
NCCL 2.27.6-1
Improve support for DirectNIC (CX8) * Add support for XDR speed detection. * When DirectNIC is enabled, report only the RDMA interfaces. Extend the P2C (PXN over C2C) support to send/receive operations. Support compilation with GCC 14 (Issues #1743, #1751). Fix the unloading of network plugins that also provide tuner capability. Fix the change of the current device across the calls to ncclCommDestroy() and ncclCommAbort(). A note for users on MNNVL systems: please ensure an adequate stack size for NCCL threads. While the default Linux stack size limit of 8192 KB is known to be sufficient, we've seen crashes if the limit is changed to "unlimited", as it causes the glibc library to unexpectedly *decrease* the stack size of NCCL's background threads to just 2048 KB. Use "ulimit -s" in bash to print the current limit; if needed, reset it to 8192 KB using "ulimit -s 8192" (one also needs to ensure that the new setting is propagated to other nodes when launching a multi-node NCCL job). |
|
|
Kamil Iskra
|
72d2432094 |
NCCL 2.27.3-1
Symmetric memory API and symmetric kernels * Redesign from the ground up, enabling major latency and bandwidth improvements. * Add new API calls to register user-allocated memory among communicator ranks into a NCCL window: ncclCommWindowRegister() and ncclCommWindowDeregister(). The calls currently support symmetric registration for P2P and NVLS, and require VMM memory buffers (i.e., CUMEM must be operational). * Implement specialized kernels taking advantage of symmetrically registered memory, with performance gains expected particularly for small to medium message sizes. * The kernels support 32 bit floating point types and smaller, and sum as the reduction operator, with no more than one collective operation per group. * Floating point summation is always done in fp32 accumulators (with the exception of fp8 on NVLS, where it uses fp16 inside the switch). Thus, the accuracy with fp8 and fp16 data types should be much improved. * This initial implementation supports non-network communicators only (P2P and NVLS transports). * To explore this functionality users need to use the new memory registration API calls with the NCCL_WIN_COLL_SYMMETRIC flag and all ranks of a communicator must pass buffers at the same offset in the same registration when invoking a collective NCCL operation. Add support for DGX Spark. Add support for DirectNIC (CX8) to the internal IB plugin. Add a new ncclCommShrink() API call * It is a non-collective call similar to ncclCommSplit(), which makes it possible to exclude some (possibly unresponsive) ranks from the parent communicator. Add support for loading multiple network plugins * This enables the creation of generic containers that can work across a range of providers. * Allow NCCL_NET_PLUGIN to accept a comma-separated list of plugins to load. NVLink SHARP (NVLS) improvements * Implement NVLS+IB SHARP support for AllGather and ReduceScatter with user buffer registration. This improves performance and reduces the number of CTAs needed to achieve peak bandwidth. * Gracefully fall back by default to other transports if NVLS initialization fails (the old behavior of returning an error code from a NCCL call can be preserved by setting NCCL_NVLS_ENABLE=1). * Decrease the NVLS channel count to 24 on Blackwell systems with multiple NVLink domains per communicator. * Enable fine-tuning of NCCL behavior per communicator using new "ncclConfig_t" members "collnetEnable", "CTAPolicy", and "nvlsCTAs". Profiler improvements * Extend the init function by adding communicator name, comm id (hash), rank, number of ranks, number of nodes, and the NCCL log function to the argument list. This makes the name and the comm id available to all events in the communicator without explicitly passing them to each individual event. Add the communicator id and rank to the profiler trace filename. Now, the communicator name can be set via a new "ncclConfig_t" member "commName". * Improve the accuracy of the GPU kernel events by providing GPU-generated timestamps for the start and stop of every NCCL operation. * Harmonize proxy events, removing overlaps between ProxyOp and ProxyStep states. * Add support for network-defined event updates (through "recordEventState"). * Report the correct number of channels used by every collective/p2p operation (used to be set to nMaxChannels for collectives and absent for p2ps). * Fix the logic on proxyCtrl Idle/Active events (Issue #1162). * Fix an issue where the network proxy profiler could lose track of an event identifier (Issue #1682). * Improve the backward compatibility with plugins older than v4. * Ensure that the work counters are 0-initialized. * Fix a potential race condition in the network profiler that could result in an event being linked to a wrong parent. MNNVL improvements * Increase to 16 the number of NICs used to communicate between MNNVL domains on GB200 systems, to optimize the performance of collective operations. * Add support for more complex MNNVL topologies with up to 32 NICs per node. * If the MNNVL fabric initialization was unsuccessful, NCCL will now fail by default, so as to avoid inadvertently falling back to a potentially much slower network transport. Such failures are typically due to a misconfigured IMEX support on the system. To continue without MNNVL, restart the job with NCCL_MNNVL_ENABLE=0. * Fix a potential hang in alltoall-like communication patterns at a scale of over 80 ranks. * Make NCCL_P2P_DISABLE=1 imply NCCL_MNNVL_ENABLE=0 (so the latter no longer needs to be specified on MNNVL systems). * Fix an initialization failure when NCCL_TOPO_FILE is used on MNNVL systems. * Fix the graph search to exclude non-local NICs. * Fix the SHM transport to use fabric handles on MNNVL systems. NIC Fusion improvements * Disable the creation of fused NICs for physical devices that haven't been merged. * Flatten multiple ports to a single PCI device within the internal IB plugin and reparent dual-port NICs under the first PCI parent. If the parent is not a PCI switch, PCI devices for fused NICs won't be duplicated. * Route traffic on GB200-CX8 systems through DirectNIC, not the host interface. Improve support for platforms with C2C connectivity (e.g., GB200) * Enable GPUDirect RDMA for the NICs by default. * Add support for P2C (PXN over C2C) and the LL128 protocol. Extend NCCL fault tolerance in multithreaded scenarios * Support the creation of multiple nonblocking communicators within a single group and polling in parallel for the completion using multiple threads (one per communicator). Enable ncclImplicitOrderLaunch for CUDA 12.9+ * This can potentially speed up NCCL_IMPLICIT_LAUNCH_ORDER. Improve the netSocket transport latency and control * Provide finer control over the size of the socket send/receive buffers, the task size, and the number of sockets that a single peer can open. * Add support for the inlining of small messages behind the header when using multiple sockets per connection. Improve the readability of the CPU affinity in the debug output * Print it as a range string rather than a bitmask. Fix a potential race condition in graph execution * A contention could arise when mixing graph and non-graph execution. Improve PXN connection code * Avoid duplicate and unused connections. RAS fixes * Fix a memory corruption at job termination time in case of a previously failed initialization of a RAS socket connection. * Fix a race condition leading to a crash when generating a RAS report during communicator initialization (Issues #1669, #1718). * Fix a potential race condition when gathering data for a RAS status report. Fix a potential memory corruption in ncclCommSplit() * Memory could get corrupted when resource sharing was in use and the size of the NVLink domain in the new communicator was smaller than in the old one. Fix asynchronous graph upload * Fix a small memory leak. * Fix oversychronization. Add a check for out-of-memory conditions in ncclMemAlloc() Clean up the NCCL socket code * accept() will retry also if just reading the magic failed (Issue #1613). * connect() will retry also if poll() did not return a POLLOUT event (Issue #1618). * Add error checking in a few instances (Issue #1539). * Fix the loop condition in ncclFindInterfaceMatchSubnet() (Issue #1574). * Clean up the debug output, downgrading WARN messages to INFO in non-critical cases, and printing the peer's address where relevant. Switch NCCL_DEBUG_FILE to line buffering * This should help avoid mixed-up partial output lines in multithreaded cases. Other minor fixes * Improve the checks for buffer overflows in the graph code (Issue #1585). * Extend logging and state clearing to all four events in the internal IB plugin (Issue #1650). * Fix the error path in case IB communication is not ready (Issue #1489). * Add ECE logging for IB fabric. * Fix various minor issues in the graph module (Issue #1635). * Clean up the debug output in the graph code, downgrading WARN messages to INFO in non-critical cases. * Add a missing argument to a directSend() call (Issue #1628). * Remove duplicate code in sendProxySetup() (Issue #1420). * Fix the order of arguments of cudaDeviceCanAccessPeer() (Issue #1507). * Fix compiler warnings with GCC 14. * Fix a typo in a comment (Issue #1236). |
|
|
Kamil Iskra
|
f44ac759fe |
NCCL 2.26.2-1
Profiler improvements * Add events for CUDA kernel start and end. * Allow network plugins to generate profiling events * Enable profiling on a per-operation basis, rather than per-communicator. * Add support for graph capturing. Add implicit launch order * Allow to prevent deadlocks when using multiple NCCL communicators per device by implicitly ordering NCCL operations using the host program order. Disabled by default, set NCCL_LAUNCH_ORDER_IMPLICIT=1 to enable. * Add a complementary mechanism to detect host threads racing to launch to the same device. Enabled by default, set NCCL_LAUNCH_RACE_FATAL=0 to disable. Optimize the PAT algorithm * Separate the computation and execution of PAT steps on different warps, allowing to run up to 16 PAT steps in parallel to significantly accelerate PAT and reduce its linear part. Add support for setting QoS per communicator * Add a new trafficClass field to the communicator configuration, to allow the application to select a particular traffic class for a given communicator. The meaning of the traffic class is network-specific and should be set in accordance with the network configuration. * For the IB/RoCE plugin, existing config variables such as NCCL_IB_SL and NCCL_IB_TC take precedence. Allow to enable GPU Direct RDMA specifically on C2C platforms * Disabled by default, set NCCL_NET_GDR_C2C=1 to enable. Do not disable user buffer registration unless PXN is really used * Only disable UB when a communicator has more than one rank per node on any node. RAS subsystem improvements * Report operation counts separately for each collective operation type. * Provide details about missing communicator ranks and reliably distinguish ranks that are no longer a given communicator's members (now reported as NOCOMM) from those that failed to respond. Add support for timestamps to NCCL diagnostic messages * On by default for WARN messages; NCCL_DEBUG_TIMESTAMP_LEVELS can be used to enable them for other debug levels as well. * The format can be changed using the NCCL_DEBUG_TIMESTAMP_FORMAT config variable. Reduce the memory usage with NVLink SHARP (NVLS) * Potentially save hundreds of MBs of device memory, considering the multicast buffer size granularity separately from the address alignment. Update performance tuning for recent Intel CPUs * Improve algorithm/protocol selection on recent CPUs such as Emerald Rapids and Sapphire Rapids. Improve channel scheduling when mixing LL and Simple operations. * Make LL operations account for 4x more traffic to ensure LL and simple operations complete at the same time. Refactor the plugin code * Clean up and harmonize the support code across the network, tuner, and profiler plugins. Add support for comment lines (starting with #) in the nccl.conf file * Issue #1540. Make user buffer registration problems print an INFO instead of a WARN. Drop support for network plugin interface version 5. Fix a race condition with split-shared communicators * NCCL could hang during connection setup if multiple communicators were grouped together that share resources. Fix a performance regression when using NCCL_CROSS_NIC=1 * NCCL would unnecessarily alternate rings, breaking the GPU-NIC associations. Make GID index detection code more resilient * Dynamic GID detection code was giving up too soon if the detected index was not available (e.g., wasn't mapped to the container's sysfs). * Issues #1538, #1573. Fix a race condition with non-blocking operation * Fix issue when creating a non-blocking communicator after a non- blocking collective operation on another communicator. Fix shared memory usage on recent Blackwell GPUs. * Issues NVIDIA/nccl-tests#287, NVIDIA/nccl-tests#291, #1637. Fix an error with NIC fusion and IB SHARP when recreating communicators * Disable the unloading of network plugins Make the auto-merge failures in the NIC fusion non-fatal * This could happen when trying to merge IB and RoCE devices. Fixes to ncclCommAbort * Fix hangs due to the progress thread spinning indefinitely on the network progress. * Reduce the abort time by up to two orders of magnitude. Fix a crash when libnccl.so was dynamically unloaded * The RAS subsystem was missing a clean-up handler. Fix a hang if the network plugin's test() call returns an error. Fix a hang on heterogeneous architectures * Ensure we harmonize the tuning to avoid different tuning choices, causing a hang. Fix double-free on failed ncclCommInitRank and ncclCommFinalize. Fix a potential list traversal bug during a group launch of multiple communicators * Issue #1599. Unify the handling of NCCL configuration variables * Under rare circumstances, some variables specified in the config file could be ignored. |
|
|
Sylvain Jeaugey
|
6aae379278 |
2.24.3-1
Network user buffer support for collectives * Leverage user buffer registration to achieve zero-copy inter-node communications for Ring, NVLS and Collnet Add RAS subsystem * Create a RAS thread keeping track of all NCCL communicators. * Add a ncclras tool contacting the RAS thread and getting a report. Add fp8 support * Add support for e5m2 and e4m3 8-bit floating point operations. * Use Tree/PAT algorithms when possible for better numerical stability. Add NIC fusion * Add a NET API to ask the network plugin to fuse a set of interfaces together. * Fuse multiple NICs under the same PCI switch as a single, larger NIC. Socket connection failure retry * Retry in case of socket connection failure (unreachable host) * Avoid "Software caused connection abort" errors on retries QP connection failure retry * Retry in case of IB QP connection failure during ibv_modify_qp. NET API improvements * Allow plugins to force a flush in case data and completion ordering is not guaranteed. * Indicate when completion is not needed (e.g. for the LL128 protocol), allowing plugins to skip generating a completion. * Allow for full offload of allgather operations when using one GPU per node. NCCL_ALGO/NCCL_PROTO strict enforcement * Extend NCCL_ALGO/NCCL_PROTO syntax to be able to specify ALGO/PROTO filters for each collective operation. * Strictly enforce the ALGO/PROTO filters, no longer fall back on the ring algorithm when the filtering leaves no option and error out instead. Enable CUMEM host allocations * Use cumem functions for host memory allocation by default. Improved profiler plugin API * Avoid dependencies with NCCL includes. * Add information on whether the buffer is registered or not Adjust PAT tuning * Improve transition between PAT and ring at scale. Fix hangs when running with different CPU architectures * Detect when we use a mix of GPU architectures * Ensure Algo/Proto decisions are made based on that unified state. Fix FD leak in UDS * Fix a leak when mapping buffers intra-node with cumem IPCs. Fix crash when mixing buffer registration and graph buffer registration. * Separate local and graph registration to avoid crashes when we free buffers. Fix user buffer registration with dmabuf * Make ncclSend/ncclRecv communication with buffer registration functional on network plugins relying on dmabuf for buffer registration. Fix crash in IB code caused by uninitialized fields. Fix non-blocking ncclSend/ncclRecv * Fix case where ncclSend/ncclRecv would return ncclSuccess in non-blocking mode even though the operation was not enqueued onto the stream. * Issue #1495 Various compiler tweaks and fixes * PR #758 Fix typo in ncclTopoPrintGraph * Issue #1468 |
|
|
Sylvain Jeaugey
|
68b542363f |
2.23.4-1
Add scalable init API * Add new ncclCommInitRankScalable to allow for passing multiple unique IDs to the init function. * Spreads the load onto multiple bootstrap roots, allowing for constant bootstrap time. * Requires multiple ranks to create a unique ID, and the CPU-side ID exchange code to call allgather[v] instead of broadcast. Accelerate init bootstrap operations * Reduce the number of calls to allgather. * Allow roots to reply early to ranks when information is already available. * Add an option to use ncclNet instead of sockets to perform bootstrap allgather operations. Add PAT algorithms for Allgather and ReduceScatter * Parallel Aggregated Trees, variation of Bruck algorithm. * Logarithmic number of network steps for small sizes at scale. * Only supports one rank per node at the moment. Add support for registered buffers for intra-node communication. * Allow registered user buffers to be accessed directly intra-node * Avoids extra copies in algorithms which permit it, saving memory bandwidth and helping with compute overlap. Add profiler plugin API * New plugin API for profiling * Supports various levels of profiling, with a hierarchy. Asynchronous graph allocation * Make calls to cudaMalloc and cudaMemcpy during graph allocation asynchronous. * Significantly speeds up graph capture. Use fatal IB asynchronous events to stop network operation * Avoids many other error messages * Only fatal errors are affected; potentially transient errors (e.g. port down) do not cause an immediate stop. Set P2P level to PXB on AMD CPUs when using more than 2 GPUs per node * P2P would cause a significant performance degradation when using many GPUs, and therefore many interleaved data flows. * Disable P2P through the CPU when we have 3+ GPUs per node; keep it enabled when we only have 2 GPUs. Improve the init logs to report the real NCCL function. * Make the log report ncclCommInitRank or ncclCommSplit, rather than the generic ncclCommInitRankFunc. Add a parameter to set the location of the user configuration file. * Add NCCL_CONF_FILE environment variable to set where the user's configuration file resides. Increase default IB timeout * Increase IB timeout value from 18 to 20. * Should help avoid fatal errors on large RoCE systems. Add new check for nvidia peermem * On linux kernels 6.6+, /sys/kernel/mm/memory_peers is no longer present; check for /sys/module/nvidia_peermem/version instead. Fix old performance regression when mixing small and large operations. * Improves distribution of work on channels. Fix crash when NUMA IDs are equal to -1. * Can happen when a NIC is a virtual NIC, or when linux doesn't know which NUMA node a device is attached to * Issue NVIDIA/nccl-tests#233 Fix tree graph search when NCCL_CROSS_NIC is set to 1. * Would force NCCL to use the balanced_tree pattern, thereby disabling LL128 on platforms with 1 GPU+1 NIC per PCI switch. * Would also try to use alternate rings even though it was not needed. Compiler tweaks and fixes * PR #1177 * PR #1228 Fix stack smash * PR #1325 Fixes for multi-node NVLink + IB operation Coverity fixes and comments. |
|
|
Sylvain Jeaugey
|
178b6b7590 |
2.22.3-1
Rework core for NVIDIA Trusted Computing * Compress work structs so that they are shared between channels * Utilize the full amount of kernel argument space permitted (4k) before resorting to work fifo. * Rework the task preprocessing phase. * Use a separate abortDevFlag which is kept in sync with abortFlag using cudaMemcpy operations. * Rename src/include/align.h to src/include/bitops.h Add lazy connection establishment for collective operations * Move buffer allocation and connection establishment to the first collective operation using that algorithm. * Accelerate init time and reduce memory usage. * Avoid allocating NVLS buffers if all calls are registered. * Compute algo/proto in ncclLaunchCollTasksInfo early on. * Connect peers in ncclCollPreconnectFunc if not connected already. * Also move shared buffer creation to the first send/recv call. Accelerate intra-node NVLink detection * Make each rank only detect NVLinks attached to its GPU. * Fuse XMLs to reconstruct the full NVLink topology Add init profiling to report time spend in different init phases. * Report timings of bootstrap, allgather, search, connect, etc. * Add new "PROFILE" category for NCCL_DEBUG_SUBSYS. Add support for PCI p2p on split PCI switches * Detect split PCI switches through a kernel module exposing switch information. * Update the topology XML and graph to add those inter-switch connections. Add cost estimation API * Add a new ncclGroupEndSimulate primitive to return the estimated time a group would take. Net/IB: Add separate traffic class for fifo messages * Add NCCL_IB_FIFO_TC to control the traffic class of fifo messages independently from NCCL_IB_TC. Merges PR #1194 Net/IB: Add support for IB router * Use flid instead of lid if subnets do not match * Warn if flid is 0 Optimizations and fixes for device network offload (unpack) * Double the default number of channels * Cache netDeviceType * Fix save/increment head logic to enable Tree support. Support ncclGroupStart/End for ncclCommAbort/Destroy * Allow Abort/Destroy to be called within a group when managing multiple GPUs with a single process. Improve Tuner API * Provide to the plugin the original cost table so that the plugin can leave unknown or disabled algo/proto combinations untouched. * Remove nvlsSupport and collnetSupport. Do not print version to stdout when using a debug file * Also print version from all processes with INFO debug level. Fixes issue #1271 Fix clang warnings in NVTX headers * Update NVTX headers to the latest version Fixes issue #1270 Disable port fusion in heterogeneous systems * Do not fuse ports if a mix of multi-port and single port are detected. Fix NVLS graphs search for dual NICs. * Fix NVLS graph search when we have more than one NIC per GPU. Fix crash with collnetDirect * Add separate graph search for collnetDirect, testing alltoall paths and working similarly to the NVLS search. Fix hang when nodes have different CPU types * Add the CPU type to the rank peer info. * Align all ranks on the CPU type after the first allgather. * Only use the aligned CPU type for all tuning operations. Fixes issue #1136 Fixes issue #1184 Fix performance of registered send/recv operations * Allow for single full size operations * Add INFO to confirm the registration of send/recv buffers. Move all sync ops to finalize stage * Ensure ncclCommDestroy is non-blocking if ncclCommFinalize has been called. Improve error reporting during SHM segment creation Improve support of various compilers Merges PR #1177 Merges PR #1228 Allow net and tuner plugins to be statically linked * Search for ncclNet or ncclTuner symbols in the main binary. Merges PR #979 Plugin examples includes cleanup * Harmonize err.h and common.h usage. * Add mixed plugin with both net and tuner. |
|
|
Sylvain Jeaugey
|
ab2b89c4c3 |
2.21.5-1
Add support for IB SHARP 1PPN operation with user buffers. Improve support for MNNVL, add NVLS support and multi-clique support. * Detect the NVLS clique through NVML * Exchange XML between peers in the same NVLS clique and fuse XMLs before creating the topology graph. * Rework bootstrap allgather algorithms to allow for large allgather operations intra-node (XML exchange). Net/IB: add support for dynamic GID detection. * Automatically select RoCEv2/IPv4 interface by default. Allow to select IPv6 or even the network/mask. Reduce NVLS memory usage. * Add stepSize as property of a connection to allow for different sizes on different peers; set it to 128K for NVLink SHARP. Improve tuner loading * Look for more paths, be more consistent with the network device plugin. * Also search for tuner support inside the net plugin. Improve tuner API * Add context to support multi-device per process. Add magic number around comm object to detect comm corruption. * Add some basic check around communicators so that we can report a problem when a communicator gets corrupted or a wrong comm pointer is passed to NCCL. Fix net/IB error path. Github PR #1164 Fix collnet rail mapping with split comm. Fix packet reordering issue causing bootstrap mismatch * Use a different tag in ncclTransportP2pSetup for the connectInfo exchange and the following barrier. Fix hang when crossNic is inconsistent between ranks. Fix minCompCap/maxCompCap computation. Github issue #1184 |
|
|
Sylvain Jeaugey
|
b6475625fb |
2.20.3-1
Add support for alternating rings, allow for cross-nic rings without cross-rail communication. Add support for user buffer registration for network send/recv. Optimize aggregated operations to better utilize all channels. Add flattening for BCM PCI gen5 switches. Add support for inter-node NVLink communication Add support for port fusion in NET/IB. Add support for ReduceScatter and AllGather using Collnet. Update net API to v8. Fix hang during A2A connection. |
|
|
Sylvain Jeaugey
|
f9c3dc251e |
2.19.1-1
Add local user buffer registration for NVLink SHARP. Add tuning plugin support. Increase net API to v7 to allow for device-side packet reordering; remove support for v4 plugins. Add support for RoCE ECE. Add support for C2C links. Better detect SHM allocation failures to avoid crash with Bus Error. Fix missing thread unlocks in bootstrap (Fixes #936). Disable network flush by default on H100. Move device code from src/collectives/device to src/device. |
|
|
Sylvain Jeaugey
|
ea38312273 |
2.18.3-1
Fix data corruption with Tree/LL128 on systems with 1GPU:1NIC. Fix hang with Collnet on bfloat16 on systems with less than one NIC per GPU. Fix long initialization time. Fix data corruption with Collnet when mixing multi-process and multi-GPU per process. Fix crash when shared memory creation fails. Fix Avg operation with Collnet/Chain. Fix performance of alltoall at scale with more than one NIC per GPU. Fix performance for DGX H800. Fix race condition in connection progress causing a crash. Fix network flush with Collnet. Fix performance of aggregated allGather/reduceScatter operations. Fix PXN operation when CUDA_VISIBLE_DEVICES is set. Fix NVTX3 compilation issues on Debian 10. |
|
|
Sylvain Jeaugey
|
d97a32fac8 |
2.18.1-1
Add support for IB SHARP to NVLS (NVLink SHARP algorithm). Add NVLS+Tree algorithm. Add support for memory management using cuMem* functions. Use all NICs for Send/Receive operations on systems with more than one NIC per GPU (#804). Add ncclCommSplit primitive, with resource sharing option in config. Fix alltoallv hang (#788) Increase number of channels on H100 when we're not limited by NVLink. Improve error reporting in case of IB failure, printing local and remote ID (#779). Add build option to allow compilation against RDMA includes instead of dynamically loading IB verbs symbols (#802). Fix context creation for progress thread (#803). NET/IB: add option to use multiple QPs in round-robin mode. Fix tree performance issue when NVB is disabled on HCM topologies. |
|
|
Kaiming Ouyang
|
006b6bc7dc | Add a comment to shutdown() in ncclSocketClose | |
|
Kaiming Ouyang
|
367e9b61c3 | Shutdown socket before close in ncclSocketClose() | |
|
Sylvain Jeaugey
|
5d3ab08b69 |
2.17.1-1
Add new NVLS algorithm for allreduce using NVLink SHARP (intra-node only). Add new config options: cgaClusterSize, minCTAs, maxCTAs, netName. Enable LL128 when we use PXN to close rings. NVTX3 includes update. Fix crash when one CollNet (SHARP) rail fails to initialize. |
|
|
Sylvain Jeaugey
|
f3d5166783 |
2.16.5-1
Add support for 400Gbit NDR network adapters (CX7) Handle EINTR in socket poll() function Add NCCL_PROGRESS_APPENDOP_FREQ to control op append overhead Resource cleanup fixes Fix double free in case of init failure Fix crash in ncclCommAbort Revert AMD speed commit |
|
|
Sylvain Jeaugey
|
28189e2df8 |
2.16.2-1
Add support for CUDA 12.0, drop Kepler (sm_35). Support for H100 features. Make socket code more robust and protected. Solves #555. Improve performance on large CUDA graphs, reducing dependencies. Reduce inter-socket bandwidth on AMD CPUs to favor better paths. Various fixes to ncclCommAbort. Make service thread polling resistant to EINTR. Compile with profiling API by default. Extend NVTX instrumentation with call arguments. |
|
|
Sylvain Jeaugey
|
c4e2aa6c79 |
2.14.3-1
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. |
|
|
Sylvain Jeaugey
|
19ab67d172 |
2.13.4-1
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. |
|
|
Sylvain Jeaugey
|
353e8ba446 |
2.12.10-1
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
|
3c223c105a |
2.12.7-1
Add network communication through another GPU connected with NVLink (PXN). Add aggregation of messages coming from different local GPUs through PXN and going to the same destination. Add new v5 plugin API with grouped receives and tags. Add compat for v4 plugins. Add naming of NCCL threads to help debugging. Fix NVLink detection and avoid data corruption when some NVLinks are down. Add support for Relaxed Ordering for IB. Add profiling and timing infrastructure. |