Gds utilities

Driver modules to blacklist for nvidia-fs "drivers": [ ], // specify list of block devices to prevent IO using libcufile "devices": [ ], // specify list of mount points to prevent IO using libcufile // (e.g. ["/mnt/test"]) "mounts": [ ], // specify list of file-systems to prevent IO using libcufile // (e.g ["lustre", "wekafs", "vast"]) "filesystems": [ ] } // Application can override custom configuration via // export CUFILE_ENV_PATH_JSON= // e.g : export CUFILE_ENV_PATH_JSON="/home//cufile.json" }4.3. GPUDirect Storage Benchmarking Tools#There are several storage benchmarking tools and utilities for Linux systems, with varying degrees offeatures and functionality. The fio utility is one of the morepopular and powerful tools that is used to generate storage IO loads and offers significant flexibilityfor tuning IO generation based on the desired IO load characteristics. For those familiar with fio onLinux systems, the use of gdsio will be very intuitive.Since GDS is relatively new technology, with support dependencies and a specific set of libraries and APIsthat fall outside standard POSIX IO APIs, none of the existing storage IO load generation utilities includeGDS support. As a result, the installation of GDS includes the gdsio load generator which providesseveral command line options that enable generating various storage IO load characteristics via both thetraditional CPU and the GDS data path.4.3.1. gdsio Utility#The gdsio utility is similar to a number of disk/storage IO load generating tools. It supports a seriesof command line arguments to specify the target files, file sizes, IO sizes, number of IO threads, and so on.Additionally, gdsio includes

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At regular intervals, such as shellwrappers that define intervals and extract the data of interest. Additionally, the Linux watch commandcan be used to monitor gds_stats data at regular intervals:Every 1.0s: gds_stats -p 951816 | grep 'BandWidth\|Latency'psg-dgx2-g02: Fri Nov 20 13:16:36 2020Read BandWidth (GiB/s): 6.38327Avg Read Latency (us): 1261Write BandWidth (GiB/s): 0Avg Write Latency (us): 0In the above example, gds_stats was started using the Linux watch command:watch -n 1 "gds_stats -p 31470 | grep 'BandWidth\|Latency'"This command results in the bandwidth and latency stats being updated in your Command Prompt window every second.5. GPUDirect Storage Benchmarking on Direct Attached Storage#This section covers benchmarking GDS on storage directly attached to the server, typically in the form ofNVMe SSD devices on the PCIe bus. The specific examples on DGX-2 and DGX A100 can be used as guidelines forany server configuration. Note that in the following examples, the output of various command line toolsand utilities is included. In some cases, rows or columns are deleted to improve readability and clarity.5.1. GPUDirect Storage Performance on DGX-2 System#Currently, GDS supports NVMe devices as direct attached storage, where NVMe SSDs are plugged directly intothe PCIe bus. The DGX-2 system comes configured with up to 16 of these devices that are typically configuredas a large RAID metadevice. As per the previous section, the DGX-2 system used to execute these exampleswas very specifically configured, such that pairs of NVMe SSDs on the same PCIe switch are in a RAID0 group,and the gdsio command line intentionally selects GPUs that share the