Add `thrust::strided_iterator` as a `thrust::counting_iterator` with step #4014

bernhardmgruber · 2025-03-04T18:37:46Z

Addresses a part of: #706

bernhardmgruber · 2025-03-04T18:40:46Z

I still need to figure out why the counting_iterator suddently has an output_iterator_tag

jrhemstad · 2025-03-04T20:51:47Z

thrust/thrust/iterator/counting_iterator.h

+
+template <typename Incrementable, typename Stride, Stride Value>
+inline _CCCL_HOST_DEVICE auto
+make_counting_iterator(Incrementable x, ::cuda::std::integral_constant<Stride, Value> stride)


kudos: Making it support integral constant for statically known step sizes is a nice addition!

miscco · 2025-03-05T12:40:53Z

thrust/testing/counting_iterator.cu

+  auto iter = thrust::make_counting_iterator(
+    &arr[0].second, ::cuda::std::integral_constant<int, sizeof(std::pair<int, double>)>{});


We should also test that it can take a runtime value

miscco · 2025-03-05T12:43:51Z

thrust/thrust/iterator/counting_iterator.h

+struct empty
+{};
+
+template <typename T>
+struct value_holder
+{
+  T value;
+
+  _CCCL_HOST_DEVICE auto operator()() const
+  {
+    return value;
+  }
+};


I believe we should be able to avoid this by using the mdspan helper __de_ice available in <cuda\std\__mdspan\submdspan_helper.h>

This is exactly why I have put this draft PR up. I was certain, we would already have a helper somewhere. Thx!

miscco · 2025-03-05T12:45:36Z

thrust/thrust/iterator/counting_iterator.h

@@ -53,7 +53,7 @@
 THRUST_NAMESPACE_BEGIN

 // forward declaration of counting_iterator
-template <typename Incrementable, typename System, typename Traversal, typename Difference>
+template <typename Incrementable, typename System, typename Traversal, typename Difference, typename Step>


I believe we should use the empty base class optimization here and inherit from Step We could also generalize __mdspan_ebco so that we do not store unneeded information

Doesn't EBO get us in trouble with MSVC + nvcc and having different sizes in host/device code?

Not if implemented through inheritance and not [[no_unique_address]]

copy-pr-bot · 2025-03-05T16:50:00Z

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bernhardmgruber · 2025-03-05T18:54:25Z

thrust/thrust/iterator/strided_iterator.h

+template <typename Iterator, typename StrideHolder = detail::empty>
+using strided_iterator =
+  transform_iterator<detail::deref,
+                     counting_iterator<Iterator, use_default, random_access_traversal_tag, use_default, StrideHolder>>;


While this definition is easy, I wonder whether we should still define a full-blown iterator without using transform and counting iterator, just to have fewer moving parts for the optimizer to fold.

Aaaaand we have to create a custom iterator, because of the proxy reference unwrapping in transform_iterator :)

bernhardmgruber · 2025-03-05T20:48:21Z

/ok to test

github-actions · 2025-03-05T22:44:24Z

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jrhemstad reviewed Mar 4, 2025

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This was referenced Mar 5, 2025

[FEA] Add iterator wrapping a T* with a custom element stride #3698

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transform_iterator fails with callables whose arguments are passed by non-const l-value ref #792

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miscco reviewed Mar 5, 2025

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bernhardmgruber force-pushed the counting_step branch from b382f05 to 8e16c10 Compare March 5, 2025 16:49

bernhardmgruber changed the title ~~Add a step to thrust::counting_iterator~~ Add thrust::strided_iterator as a thrust::counting_iterator with step Mar 5, 2025

bernhardmgruber commented Mar 5, 2025

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bernhardmgruber force-pushed the counting_step branch from f3a6cc6 to 6d1b3ae Compare March 5, 2025 20:48

bernhardmgruber added 2 commits March 6, 2025 12:26

Refactor

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Add strided_iterator and counting_iterator with a Step

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bernhardmgruber force-pushed the counting_step branch from 6d1b3ae to 0a998b7 Compare March 6, 2025 11:29

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Add `thrust::strided_iterator` as a `thrust::counting_iterator` with step #4014

Add `thrust::strided_iterator` as a `thrust::counting_iterator` with step #4014

bernhardmgruber commented Mar 4, 2025 •

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🟨 thrust: Pass: 91%/45 | Total: 1d 00h | Avg: 33m 17s | Max: 1h 14m | Hits: 53%/73295

🟨 cub: Pass: 93%/45 | Total: 1d 18h | Avg: 57m 11s | Max: 1h 27m | Hits: 30%/49960

🟨 cccl_c_parallel: Pass: 50%/2 | Total: 11m 08s | Avg: 5m 34s | Max: 8m 39s | Hits: 95%/154

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		auto iter = thrust::make_counting_iterator(
		&arr[0].second, ::cuda::std::integral_constant<int, sizeof(std::pair<int, double>)>{});

Add thrust::strided_iterator as a thrust::counting_iterator with step #4014

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Add thrust::strided_iterator as a thrust::counting_iterator with step #4014

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🟨 thrust: Pass: 91%/45 | Total: 1d 00h | Avg: 33m 17s | Max: 1h 14m | Hits: 53%/73295

🟨 cub: Pass: 93%/45 | Total: 1d 18h | Avg: 57m 11s | Max: 1h 27m | Hits: 30%/49960

🟨 cccl_c_parallel: Pass: 50%/2 | Total: 11m 08s | Avg: 5m 34s | Max: 8m 39s | Hits: 95%/154

🟥 python: Pass: 0%/1 | Total: 7m 08s | Avg: 7m 08s | Max: 7m 08s

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Add `thrust::strided_iterator` as a `thrust::counting_iterator` with step #4014

Add `thrust::strided_iterator` as a `thrust::counting_iterator` with step #4014

bernhardmgruber commented Mar 4, 2025 •

edited

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