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Support v3 cuda array interface. #6776

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merged 7 commits into from
Mar 25, 2021

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Close #6753 .

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Codecov Report

Merging #6776 (f3fe1d9) into master (bcc0277) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master    #6776   +/-   ##
=======================================
  Coverage   81.78%   81.78%           
=======================================
  Files          13       13           
  Lines        3848     3848           
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  Hits         3147     3147           
  Misses        701      701           

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cudaStreamCreate(&stream);

auto j_arr =Json::Load(StringView{arr_str});
j_arr["stream"] = Integer(reinterpret_cast<int64_t>(stream));
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Is this a safe cast?

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When you start reinterpreting bits,it's hard to argue what's safe ..

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Is the stream a memory address, or is it something else, like a struct?

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It's an opaque pointer.

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@hcho3 hcho3 Mar 25, 2021

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Got it. Then casting it to an integer should be safe.

dh::caching_device_vector<uint64_t> out(1, 0);
uint64_t dur = 1e9;
dh::LaunchKernel{1, 1, 0, stream}(SleepForTest, out.data().get(), dur);
ArrayInterface arr(arr_str);
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This is a nice test to test whether stream has been properly synchronized.

@trivialfis trivialfis merged commit 794fd6a into dmlc:master Mar 25, 2021
@trivialfis trivialfis deleted the array-interface-cuda-stream branch March 25, 2021 01:58
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Support new __cuda_array_interface__.
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