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Samples for CUDA Developers which demonstrates features in CUDA Toolkit
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cuda-samples/Samples/1_Utilities/README.md

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1. Utilities

bandwidthTest

This is a simple test program to measure the memcopy bandwidth of the GPU and memcpy bandwidth across PCI-e. This test application is capable of measuring device to device copy bandwidth, host to device copy bandwidth for pageable and page-locked memory, and device to host copy bandwidth for pageable and page-locked memory.

deviceQuery

This sample enumerates the properties of the CUDA devices present in the system.

deviceQueryDrv

This sample enumerates the properties of the CUDA devices present using CUDA Driver API calls

topologyQuery

A simple example on how to query the topology of a system with multiple GPU