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- Voronyuk Mikhail October 2011
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- gpudirect 11
concurrent GPUdirect transfers
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Let's say I have 4 Fermi-GPUs on the same PCIe2 bus, i.e. each one of them occupies four different ports on the same IOH. Can I concurrently transfer data from 1 to 2, 2 to 3, 3 to 4 and 4 to 1? Or is there an inherent limit on the number of concurrent P2P transfers in PCIe? If there isn't, do main boards usually support using all PCIe lanes of all members at the same time?
Thank you for your help! -
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As you can see at Multi-GPU and Host Multi-Threading Considerations webinar (http://developer.nvidia.com/gpu-computing-webinars), the transfer on a PCIe link is able to be duplex (then directions are different). So, if you have a HW, which is similar to one at p.21, you'll be able to transfer concurrently thus, as you've described.