qerteng.blogg.se - Flow free bridges transfer data

#FLOW FREE BRIDGES TRANSFER DATA HOW TO#
#FLOW FREE BRIDGES TRANSFER DATA CODE#
#FLOW FREE BRIDGES TRANSFER DATA SERIES#

#FLOW FREE BRIDGES TRANSFER DATA CODE#

However, we can get the elapsed transfer time without instrumenting the source code with CUDA events by using nvprof, a command-line CUDA profiler included with the CUDA Toolkit (starting with CUDA 5). To measure the time spent in each data transfer, we could record a CUDA event before and after each transfer and use cudaEventElapsedTime(), as we described in a previous post. Measuring Data Transfer Times with nvprof

#FLOW FREE BRIDGES TRANSFER DATA HOW TO#

First I want to talk about how to measure time spent in data transfers without modifying the source code. We investigate the first three guidelines above in this post, and we dedicate the next post to overlapping data transfers.

Data transfers between the host and device can sometimes be overlapped with kernel execution and other data transfers.

Batching many small transfers into one larger transfer performs much better because it eliminates most of the per-transfer overhead.

Higher bandwidth is possible between the host and the device when using page-locked (or “pinned”) memory.

Minimize the amount of data transferred between host and device when possible, even if that means running kernels on the GPU that get little or no speed-up compared to running them on the host CPU.

Let’s start with a few general guidelines for host-device data transfers. This disparity means that your implementation of data transfers between the host and GPU devices can make or break your overall application performance. The peak bandwidth between the device memory and the GPU is much higher (144 GB/s on the NVIDIA Tesla C2050, for example) than the peak bandwidth between host memory and device memory (8 GB/s on PCIe x16 Gen2). In this and the following post we begin our discussion of code optimization with how to efficiently transfer data between the host and device.

#FLOW FREE BRIDGES TRANSFER DATA SERIES#

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