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Re: [Starpu-devel] support for cudaMemcpyPeer


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  • From: Samuel Thibault <samuel.thibault@inria.fr>
  • To: Hatem Ltaief <hatem.ltaief@kaust.edu.sa>
  • Cc: "starpu-devel@lists.gforge.inria.fr" <starpu-devel@lists.gforge.inria.fr>
  • Subject: Re: [Starpu-devel] support for cudaMemcpyPeer
  • Date: Sun, 25 Mar 2018 13:02:50 +0200
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Hatem Ltaief, on dim. 25 mars 2018 10:58:22 +0000, wrote:
> On Mar 24, 2018, at 4:09 PM, Samuel Thibault
> <[1]samuel.thibault@inria.fr>
> wrote:
>
> Hatem Ltaief, on sam. 24 mars 2018 13:52:01 +0000, wrote:
>
> You are right, I have omitted the dyn libs. So, it is there
>
>
> How is it there exactly? Please send the nm output :)
>
>
> hltaief@samsara:~/benchmarks/dpotrf$ nm -D /usr/local/cuda/lib64/
> libcudart.so.9.0 | grep MemcpyPeer
> 000000000003f510 T cudaMemcpyPeer
> 000000000004bdd0 T cudaMemcpyPeerAsync

Ok, so I have no idea why the test would fail to find it.

> There is no reason why we should use -lcudart_static.
>
> That being said, I just dropped that detection, it can only pose problem
> whenever NVidia does tricky things with the symbol, and nowadays we can
> safely assume by default that it is available.
>
> Not sure I followed you on this one.
> Can you please explain?

I simply removed the test, and instead made configure assume that the
symbol is there, which gets the issue away.

Samuel


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