Ucx environment variables. Mar 31, 2023 · Modify gpu_perf_job.

Ucx environment variables UCX_SHM_DEVICES for specifying the shared memory devices. System Variables. UCX can run in a container, but requires slight adjustments: Some transports may be unsupported, depending on the runtime configuration. The environment variables are mostly intended for advanced users, or for specific tunings or workarounds recommended by the UCX community. UCX_TCP_TX_MAX_BUFS: maximum number of buffers in the buffer pool on the TX side. NVSHMEM_LIBFABRIC_PROVIDER This threshold is managed by the “UCX_TM_THRESH” environment variable (its default value is 1024 bytes). The environment variables are mostly intended for advanced users, or for specific tunings or workarounds recommended by the UCX community. UCX plugin with UCP API, UCX rendezvous. Jan 27, 2020 · I have programs hanging if I set UCX_SHM_DEVICES to an explicit full list from the warning message, whereas they run with all. . Run module spider UCX to find out what environment modules are available for this application. To see the available transports use ucx_info -d . The UCX_NET_DEVICES environment variable is by default set to all, meaning that UCX may choose to use any available network interface controller (NIC). UCX_ACC_DEVICES for specifying the acceleration devices. For example: Jan 21, 2025 · NCCL UCX plugin (if enabled) replaces the default NCCL verbs-based inter-node communication routines with UCX-based communication routines. UCX may also use bounce buffers for hardware Tag Matching, offloading internal pre-registered buffers instead of user buffers up to a certain threshold. The module command provides a user interface to the Modules package. Running NCCL UCX Plugin. CPE Environment Modules enables users to modify their environment dynamically by using modulefiles. The general approach is that users should not set any environment variables to make UCX work. UCX plugin with UCT API directly, write-based RDMA operations For distributed applications, it can sometimes be useful to also enable additional logging for the UCX library used to transmit data between fragments. Does not affect semantics, but only transport selection criteria and the resulting performance. tcp None ¶ Set environment variables to enable TCP over UCX, even if InfiniBand and NVLink are not supported or disabled. Values: y, n. Run the job using az ml job create. Oct 11, 2019 · UCX environment variables are intended mostly for expert/intermediate level debugging and tuning, or as workarounds for issues found by users. Mar 31, 2023 · Modify gpu_perf_job. It should be UCX_SHM_DEVICES=memory. Various UCX plugins are available: NCCL_PLUGIN_P2P=ucx. yml you'll find an environment variables section that you can leverage for testing your specific configuration. Configuration variables applying to the UCP context. For examples please see: specs of UCX environment variables; specs of NCCL environment Environment Variables¶ NCCL has an extensive set of environment variables to tune for specific usage. IMPORTANT NOTE: Setting UCX environment variables to non-default values may lead to undefined behavior. In gpu_perf_job. ucx. For example, those files could contain : UCX takes parameters from specific environment variables, which start with the prefix UCX_. For example, we saw a system with UCX_MEM_MMAP_HOOK_MODE set to none. The only available device is memory. A list of problems we have run into along the way while trying to understand performance issues with UCX/UCX-Py: System-wide settings environment variables. Environment variables can also be set statically in /etc/nccl. This may be used even if InfiniBand and NVLink are not supported or disabled, then transferring data over TCP. Where can I see all UCX environment variables? ¶ Running ucx_info -c prints all environment variables and their default values. NCCL_PLUGIN_P2P=ucx_uct. Sets the UCX_TLS variable which restricts the transports to use. The module command system interprets modulefiles, which contain Tool Command Language (Tcl) code, and dynamically modifies shell environment variables such as PATH and MANPATH. One should use such variable names as "UCX_TLS" and *not* variants such as "UCX_GASNET_TLS" or "GASNET_UCX_TLS". comm. nvlink None ¶ For example, when used from MPI or SHMEM libraries, this number will specify the number of ranks (or processing elements) in the job. Set environment variables. 0. Unsetting this env var resolved problems: https://github. HPC_UCX_DIR - installation directory Saved searches Use saved searches to filter your results more quickly Jan 18, 2024 · If you are building your own UCX and setting some UCX env variables that has nothing to do with PMI/srun/mpirun. UCX_TCP_TX_BUFS_GROW: number of UCC exposes environment variables to tune CL and TL selection and behavior. g. For example: mlx5_1:1 , mlx5_1:1 GEMINI. 16. UCX takes parameters from specific environment variables, which start with the prefix UCX_. The default value is -1, indicating infinite number of buffers. By default, UCX_TLS=all and UCX will attempt to choose the optimal transport layer automatically. May 23, 2024 · The "UCX_TLS" environment variable controls transport selection and is one of the most commonly used UCX parameters. com/rapidsai/ucx-py/issues/616. The value can be also set by UCX_NUM_EPS environment variable. UCX is always used with Infiniband networks / the mlx provider and UCX environment variables are always used by UCX. For example, when used from MPI or SHMEM libraries, this number will specify the number of ranks (or processing elements) in the job. To resolve this, use the UCX environment variable UCX_NET_DEVICES to specify which devices UCX can use. This will disable device side global exit and device side wait timeout polling (enabled by NVSHMEM_TIMEOUT_DEVICE_POLLING build-time variable) because these are processed by the proxy thread. distributed. Its default has been changed to y starting with UCX 1. The list of all environment variables with a description is available from ucc_info : $ ucc_info -caf | head -15 # UCX library configuration file # Uncomment to modify values # # UCC configuration # # # Comma separated list of CL components to be used # # syntax: comma 2 days ago · The UCX_TLS environment variable can be used to control which transport layers are enabled. The default value is 8 KB. For example: Use UCX_RNDV_THRESH environment variable to lower the rendezvous threshold from the 8KB default to 128B to improve the midrange performance. yml to use your new environment name/version. Changing the values of UCX environment variables to non-default values may lead to undefined behavior. UCX Environment Variables in UCX-Py In this section we go over a brief overview of some of the more relevant variables for current UCX-Py usage, along with some comments on their uses and limitations. UCX_SHM_DEVICES=cma,knem,posix,sysv is an invalid full list - this is why the warning is printed. To see a complete list of UCX environment variables, their descriptions and default values, please run the command-line tool ucx_info -f. , a BlueField cannot reach another BlueField via tmfifo_net0), UCX communication may fail. In order to manipulate different shared memory transports need to use UCX_TLS UCX_TCP_TX_SEG_SIZE: size of the buffer on the transmit (TX) side. In order to specify the devices to use for the run, please use the following environment parameters: UCX_NET_DEVICES for specifying the network devices. This threshold is controlled by the UCX_TM_MAX_BB_SIZE environment variable. Enable the new protocol selection logic, also known as “protov2”. When running on an NVLink-only configuaration (No-IB, No-UCX), completely disable the proxy thread. Oct 24, 2023 · If one of the destinations is not reachable via a certain network device (e. DEBUG For example, when used from MPI or SHMEM libraries, this number would specify the number of ranks (or processing elements) in the job. The accepted values are defined in the UCX documentation and may vary between installations. To see a complete list of UCX environment variables, their descriptions and default values, please run the command-line tool ucx_info-f. Multiple values can be set and must be separated by commas. conf (for an administrator to set system-wide values) or in ${NCCL_CONF_FILE} (since 2. The UCX environment variables are mostly designed for advanced users, or for specific tunings or workarounds recommended by HPE. Available options are: $ ucx_info -f | grep UCX_TLS -B 23 | head -n 20 # # Comma-separated list of transports to use. 23; see below). Set environment variables to enable CUDA support over UCX. The "UCX_TLS" environment variable controls transport selection and is one of the most commonly used UCX parameters. If not set, UCX tries to use all available transports and selects the best ones according to their performance capabilities and UCX website Unified Communication X: an open-source, production-grade communication framework for data-centric and high-performance applications Environment Modules. Dec 11, 2024 · If one of the destinations is not reachable via a certain network device (e. This can be done by setting the UCX environment variable UCX_LOG_LEVEL to one of: fatal, error, warn, info, debug, trace May 23, 2024 · Therfore, that prior recommendation is withdrawn. jghv upmpwqa aytyg fnjei onuqdj tpiox wkzj fme vsuf tdwr