NCCL’s collective, P2P and group operations all support CUDA Graph captures. This support requires a minimum CUDA version of 11.3. The following sample code shows how to capture computational kernels and NCCL operations in a CUDA Graph: cudaGraph_tgraph;cudaStreamBeginCapture(stream);kernel_A<<...
NCCL’s collective, P2P and group operations all support CUDA Graph captures. This support requires a minimum CUDA version of 11.3. The following sample code shows how to capture computational kernels and NCCL operations in a CUDA Graph: cudaGraph_tgraph;cudaStreamBeginCapture(stream);kernel_A<<...
NCCL的支持: Using NCCL with CUDA Graphs nccl勉强支持再cuda graph中增加nccl的运算。具体示例如下: cudaGraph_tgraph;cudaStreamBeginCapture(stream);kernel_A<<<...,stream>>>(...);kernel_B<<<...,stream>>>(...);ncclAllreduce(...,stream);kernel_C<<<...,stream>>>(...);cudaStreamEndC...
先看ncclTopoFillGpu,从本GPU node根据pci-e的pciPath开始一路自底向上建立pciNode直到rc(cpu/numa node),比如说GPU0 -> PCI-1 -> PCI-0 -> CPU0这样来建立节点;GPU node的busid(BDF)可以通过cudaDeviceGetPCIBusId来获取;对于ncclTopoFillNet也是一样的逻辑。至此上图的topo就建立成一个xml树了。 这里...
-G,--cudagraph 将迭代作为CUDA图形捕获,然后重复指定的次数,默认:0; 案例验证:优化GPU互连拓扑 下图是一个未优化的双机8卡(H20)组网测试拓扑: 按照一般CPU云数据中心的连接方式,将同服务器的网卡连接到一台交换机上,两台交换机之间有4条400G链路相连。参与测试的为星融元(Asterfusion)交换机(CX732Q-N,32 x...
I know that nccl supports cuda graph for scale up case, and how about the scale out case? if yes, is there any example code? thanks.Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment ...
-G,--cudagraph <num graph launches> 将迭代作为CUDA图形捕获,然后重复指定的次数,默认:0; 案例验证:优化GPU互连拓扑 下图是一个未优化的双机8卡(H20)组网测试拓扑: 按照一般CPU云数据中心的连接方式,将同服务器的网卡连接到一台交换机上,两台交换机之间有4条400G链路相连。参与测试的为星融元(Asterfusion)交换...
-G,--cudagraph <num graph launches> 将迭代作为CUDA图形捕获,然后重复指定的次数。默认值为:0。 常见问题 1. 如何实现持续运行 nccl-test 可以通过,使用 `-b`, `-e`选项将数据量设置为一致的,使用`-i 0`将每次增加的数据步长设置为 0,就可以实现持续运行该数据大小的 nccl-test 测试。 我正在参与2023...
-G,--cudagraph <num graph launches> 将迭代作为CUDA图形捕获,然后重复指定的次数,默认:0; 案例验证:优化GPU互连拓扑 下图是一个未优化的双机8卡(H20)组网测试拓扑: 按照一般CPU云数据中心的连接方式,将同服务器的网卡连接到一台交换机上,两台交换机之间有4条400G链路相连。参与测试的为星融元(Asterfusion)交换...
allGather3Data用于rank间聚合channel的信息，ncclGraphInfo记录了环的信息，比如speed和type struct ncclGraphInfo { int sameChannels; float speedIntra; float speedInter; int typeIntra; }; struct { int cudaCompCap; int fullCudaCompCap; int nChannels; struct ncclGraphInfo...