How does GPUDirect work?

How does GPUDirect work?

GPUDirect Storage It avoids extra copies through a bounce buffer in the CPU’s memory, enabling a direct memory access (DMA) engine near the NIC or storage to move data on a direct path into or out of GPU memory — all without burdening the CPU.

Does GPUDirect need storage?

Storage DMA engines cannot target GPU memory through the file system without GPUDirect Storage. DMA engines, however, need to be programmed by a driver on the CPU. When the CPU programs the GPU’s DMA, the commands from the CPU to GPU can interfere with other commands to the GPU.

What is GPUDirect Rdma?

GPUDirect RDMA is a technology introduced in Kepler-class GPUs and CUDA 5.0 that enables a direct path for data exchange between the GPU and a third-party peer device using standard features of PCI Express. Examples of third-party devices are: network interfaces, video acquisition devices, storage adapters.

What is GPUDirect for video?

NVIDIA® GPUDirect for Video technology allows 3rd party hardware to efficiently communicate with NVIDIA GPUs and minimize historical latency issues. With NVIDIA GPUDirect for Video, IO devices are fully synchronized with the GPU and the CPU to minimize wasting cycles copying data between device drivers.

What is Nvidia Dali?

The NVIDIA Data Loading Library (DALI) is a library for data loading and pre-processing to accelerate deep learning applications. It provides a collection of highly optimized building blocks for loading and processing image, video and audio data.

What is BAR1 memory?

BAR1 Memory Usage BAR1 is used to map the FB (device memory) so that it can be directly accessed by the CPU or by 3rd party devices (peer-to-peer on the PCIe bus). BAR1 is a virtual address space that maps the device memory for DMA access from the host and/or other DMA enabled devices.

Do graphics cards use DMA?

Many hardware systems use DMA, including disk drive controllers, graphics cards, network cards and sound cards. DMA is also used for intra-chip data transfer in multi-core processors.

What is Rdma used for?

Overview. Remote Direct Memory Access (RDMA) is an extension of the Direct Memory Access (DMA) technology, which is the ability to access host memory directly without CPU intervention. RDMA allows for accessing memory data from one host to another.

What is resizable bar?

Resizable BAR essentially makes the entirety of the graphics frame buffer accessible to the CPU at once; where it could once sip, it now guzzles. The idea is that once textures, shaders and geometry are loading in faster, games should run faster with higher frame rates.

What does Nvidia SMI do?

The NVIDIA System Management Interface (nvidia-smi) is a command line utility, based on top of the NVIDIA Management Library (NVML), intended to aid in the management and monitoring of NVIDIA GPU devices.

What is PCI bar?

Each non-bridge PCI device function can implement up to 6 BARs, each of which can respond to different addresses in I/O port and memory-mapped address space. Each BAR describes a region that is between 16 bytes and 2 gigabytes in size, located below 4 gigabyte address space limit.

Which is the fastest DMA mode?

Burst or block transfer DMA
1) Burst or block transfer DMA It is the fastest DMA mode. In this two or more data bytes are transferred continuously. Processor is disconnected from system bus during DMA transfer. N number of machine cycles are adopted into the machine cycles of the processor where N is the number of bytes to be transferred.

What is GPUDirect storage and how does it work?

GPUDirect Storage enables a direct data path between local or remote storage, such as NVMe or NVMe over Fabric (NVMe-oF), and GPU memory.

What is NVIDIA GPUDirect for video and how does it work?

GPUDirect for Video offers an optimized pipeline for frame-based devices such as frame grabbers, video switchers, HD-SDI capture, and CameraLink devices to efficiently transfer video frames in and out of NVIDIA GPU memory.

How to install Nvidia drivers on Linux?

1 Clone repo and get source code of NVIDIA-Linux-x86_64-X.Y driver the same version as installed in your systems. 2 Extract it in the gpudma project directory and create symbolic link “nvidia” on NVIDIA-Linux-x86_64-X.Y driver directory.

What is the use of gpumem?

This memory pointer passed to gpumem module. Gpumem module get address of all physical pages of the allocates area and GPU page size. Application can get addresses and do mmap (), fill data pattern and free all of them. Than release GPU memory allocation and unlock pages. app_template must be built with Nsight Eclipse Edition from NVIDIA.