host proxy thread0 调用NET(一般是IB)去send data到host proxy progress thread1 in node1 host proxy progress thread1 recv data,gpu1在kernel里read data 两个GPU单机通信和多机通信的区别 ncclInfo转化为ncclQueueElem的同时会转化为一个ncclProxyOp(是eqElem的数据成员),ncclProxyOp即是main thread和proxy ...
分配内存ncclResult_tinitChannel;## 初始化shared resourcescomm->sharedRes->tpRankToLocalRankcomm->topParentLocalRanks## 启动proxy service threadncclResult_tncclProxyCreate;## 构建p2p schedulecomm->p2pSchedulecomm->planner.peers## 初始化channelsstaticnccl...
Values accepted¶ On AWS, the default value is 8; in other cases, the default value is 1. For generic 100G networks, this value can be manually set to 4. However, the product ofNCCL_SOCKET_NTHREADSandNCCL_NSOCKS_PERTHREADcannot exceed 64. See alsoNCCL_SOCKET_NTHREADS. NCCL_CROSS_NIC...
active_width); IB异步主线程: static void* ncclIbAsyncThreadMain(void* args) wrap_ibv_event_type_str(&str, event.event_type)) -> 事件转字符串 wrap_ibv_ack_async_event(&event) 总结 NCCL库用原生的RDMA的VERBS接口,极简(相比UCX和Libfabric,或其他verbs通信库)的实现了单边读写和双边发送/接收...
() from /lib64/libc.so.6 Thread 14 (Thread 0x7fc564ba8000 (LWP 3913229) "executor_server"): #0 0x00007fd0b0d8c48c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0 #1 0x00007fd0b4847727 in ncclProxyProgress(void*) () from /lib64/libnccl.so.2 #2 0x00007...
gpu02:35637:35725 [0] NCCL INFO proxy.cc:494 -> 5 gpu02:35637:35725 [0] NCCL INFO proxy.cc:614 -> 5 [Proxy Thread] Author Just if it helps the same setup, but with NCCL 2.11.4+cuda11.4 andNCCL_NET=Socketworks Rank 0: Completed store-based barrier for key:store_based_barrier_...
Finally, NCCL is compatible with virtually any multi-GPU parallelization model, for example: ‣ single-threaded ‣ multi-threaded, for example, using one thread per GPU NVIDIA Collective Communication Library (NCCL) RN-08645-000_v2.24.3 | 1 NCCL Overview ‣ multi-...
__device__ void ncclAllReduceRingKernel(struct CollectiveArgs* args) {const int tid = threadIdx.x;const int nthreads = args->coll.nThreads-WARP_SIZE;const int bid = args->coll.bid;const int nChannels = args->coll.nChannels;struct ncclDevComm* comm = args->comm;struct ncclChannel* channe...
NCCL源码详解1:NCCL官网使用/调用案例 Example : One Device per Process or Thread包含视频教程-CSDN博客 NCCL源码详解2:通信初始化如何获取唯一ID UniqueId,ncclGetUniqueId()中ncclInit()、bootstrapGetUniqueId()包含视频教程-CSDN博客 图示: 爱串门的小马驹太牛皮了,居然有图示,我都爱死我自己了。
And that NCCL’s Point-to-Point Send operation fills in the buffer of the target rank using the kernel and proxy thread, while Recv operation fetches the data in the buffer in FIFO, making space for another Send.(Please correct me if I’m wrong) Based on this point, I have concluded ...