c++ - How do I discover the PCIe bus topology and slot numbers …
Or if I already know hardware PCIe topology with PCIe-switches, then I must know, to which hardware PCIe slot on board is connected any GPU card. As I know, even if I already know hardware PCIe topology with PCIe-switches, then these identifiers is not hard-bound to PCIe slots on the board, and these IDs may change and be different from run to ...
cpu - How is PCI segment(domain) related to multiple Host …
2018年3月1日 · The PCIe specification uses the word PCI segment group to define a numbering per PCR (simply put the PCI segment group is the base address of the extended CAS mechanism of each PCR, so there is a one-to-one mapped natively). Due to their isolation property, the ports of the PCR are called PCIe Root Port.
In Linux, is there a way to find out which PCI card is plugged into ...
2014年9月18日 · # dmidecode -t slot | grep -A8 'Slot 3' Designation: PCIe Slot 3 Type: x16 PCI Express 3 Current Usage: In Use Length: Long ID: 3 Characteristics: 3.3 V is provided PME signal is supported Bus Address: 0000:5e:00.0 # lspci -s 5e:00.0 5e:00.0 Ethernet controller: Solarflare Communications XtremeScale SFC9250 10/25/40/50/100G Ethernet Controller ...
How to get the topology of GPU devices? - Stack Overflow
2023年4月15日 · I want to write a function that returns the topology of the underlying GPU devices as a graph. I want the connections to indicate where data transfer can occur, and the weights to be the throughput capacity of these connections.
PCI Express BAR memory mapping basic understanding
Assuming it is, yes you can transfer data between a slave PCIe device and host using a DMA controller. I am working on a project which involves "PCIe-DMA" connected with the host over the PCIe bus. Really depends on your design and implementation. So in my case PCIe-DMA is itself a slave PCIe device on the target board connected to the host ...
How to remove CL_INVALID_PLATFORM error in opencl code?
2013年10月2日 · Doing simple matrix multiplication using OpenCL: // Multiply two matrices A * B = C #include <stdlib.h> #include <stdio.h> #include <math.h> #include <oclUtils.h> #defin...
What is the common topology of GPU within clusters?
2020年2月13日 · A two-socket system has several PCIe root ports on each socket. A PCIe bridge is attached to each root port, and the GPUs are attached to the bridges. Connections labeled PIX are between GPUs attached to the same bridge. Connections labeled NODE are between GPUs attached to two different bridges (on two different root ports).
Looking for a tool to examine a PCIe Device tree [closed]
2014年5月29日 · I am looking for a tool that can show the device tree for pci express devices including switches. I am trying to examine the topology of the pcie from root port down to debug some issues we are hav...
pci e - PCIe BAR alignment issue under Linux - Stack Overflow
2024年8月28日 · As the PCIe core code is platform-independent, my first try is to use qemu-system-x86_64, but the problem with qemu x86_64 platform is that it uses UEFI BIOS by default thus the PCIe scanning process is not the same as on my platform, further more, the device tree is replaced by ACPI tables, and it's hard to modify the PCIe bus topology of the ...
Figuring out GPU links topology programmatically with CUDA
2019年9月18日 · I'm trying to figure out link topology between GPUs. Basically, do pretty much the same nvidia-smi topo -m does. I've found a CUDA example topologyQuery, which basically calls cudaDeviceGetP2PAttribute(&perfRank, cudaDevP2PAttrPerformanceRank, device1, device2) for each pair of GPUs.