Terminating an MPS client without synchronizing with all outstanding GPU work (via Ctrl-C / program exception such as segfault. Attempting to allocate more page-locked memory than the allowed size using any of relevant CUDA APIs The amount of page-locked host memory that pre-Volta MPS client applications can allocate is limited by the size of the tmpfsįilesystem (/dev/shm). CUDA graphs with host nodes are not supported under MPS on pre-Volta MPS clients. Calling any stream callback APIs will return an error. Stream callbacks are not supported on pre-Volta MPS clients. The server is not running with the same UID. The client application will fail to initialize if MPS server only supports clients running with the same UID as the server. CUDA module load will fail if the module uses dynamic parallelism features. Context creation in the client will fail if the context version it must not have been builtīy setting CUDA_FORCE_API_VERSION to an earlier version). #Dim3 dimblockx driver#
If an application uses the CUDA driver API, then it must use headers from CUDA 4.0 or later (i.e.The MPS server will fail to start if the CUDA application is not 64-bit. Only 64-bit applications are supported.The NVIDIA Codec SDK: is not supported under MPS on pre-Volta MPS clients.All MPS client behavior will be attributed to the MPS server process by system monitoring and accounting tools (e.g.
Of the GPU between users regardless of GPU exclusivity settings.
The MPS control daemon will queue MPS server activation requests from separate users, leading to serialized exclusive access. Only one user on a system may have an active MPS server. Exclusive-mode restrictions are applied to the MPS server, not MPS clients. 
The amount of page-locked host memory that can be allocated by MPS clients is limited by the size of the tmpfs filesystem. If UVA is unavailable, the MPS server will fail to start. On a GPU with compute capability version 2.0 or higher. The Unified Virtual Addressing (UVA) feature of CUDA must be available, which is the default for any 64-bit CUDA program running. The MPS server will fail to start if one of the GPUs visibleĪfter applying CUDA_VISIBLE_DEVICES is not of compute capability 3.5 or higher. MPS requires a GPU with compute capability version 3.5 or higher. The MPS server will fail to start when launched on Tegra platforms. MPS is not supported on Tegra platforms. The MPS server will fail to start when launched on an operating system MPS is only supported on the Linux operating system. Launches from different processes to run concurrently and remove an unnecessary point of serialization from the computation. Though the total amount of computation work stays the same, the work per process decreasesĪnd may underutilize the available compute capacity while the application is running. These cases arise in strong-scaling situations, where the compute capacity (node, CPU core and/or GPU count) is increased MPS allows the leftover GPU capacity to be occupied with CUDA kernels running from other May be achievable with MPS.Using fewer blocks-per-grid in the kernel invocation and more threads-per-block to increase the Applications like this are identified by having a small number of blocks-per-grid.įurther, if the application shows a low GPU occupancy because of a small number of threads-per-grid, performance improvements Per node using MPS to enable more concurrency. MPS is useful when each application process does not generate enough work to saturate the GPU.
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