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Add libcu++ dependency; initial round of NV_IF_TARGET ports. - #1605

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NVIDIA:mainfrom
alliepiper:if_target_prep
May 17, 2022
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Add libcu++ dependency; initial round of NV_IF_TARGET ports.#1605
alliepiper merged 10 commits into
NVIDIA:mainfrom
alliepiper:if_target_prep

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@alliepiper alliepiper commented Jan 24, 2022 •
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Requires NVIDIA/cub#448.

This PR contains an initial set of changes necessary to migrate Thrust and CUB to NV_IF_TARGET and remove dependence on __CUDA_ARCH__. It does not fully remove all usages of __CUDA_ARCH__, but rather focuses on the following:

  • Establish the libcu++ dependency for both Thrust and CUB.
  • Remove obsolete checks for unsupported CUDA architectures.
  • Migrate host/device divergent code from #ifdef __CUDA_ARCH__ to use NV_IF_TARGET.

This also includes various bug fixes for issues exposed by the above.

Future PRs will address the remaining usages of __CUDA_ARCH__ in the CDP macros and the kernel dispatch infrastructure.

Pre-written Release Notes

Breaking Changes

Other Enhancements

Bug Fixes

@alliepiper alliepiper added the blocked Cannot make progress. label Jan 24, 2022
@alliepiper alliepiper self-assigned this Jan 24, 2022
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alliepiper marked this pull request as draft January 24, 2022 23:11
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@alliepiper alliepiper added this to the 1.17.0 milestone Jan 25, 2022
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alliepiper force-pushed the if_target_prep branch 2 times, most recently from 058166e to 9065dda Compare February 4, 2022 16:42
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alliepiper force-pushed the if_target_prep branch 2 times, most recently from 17cfee7 to e12b463 Compare February 4, 2022 22:17
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@alliepiper alliepiper changed the title Draft: libcudacxx, if-target prep/testing Add libcu++ dependency; initial round of NV_IF_TARGET ports. Mar 24, 2022
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alliepiper marked this pull request as ready for review March 24, 2022 21:42
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alliepiper commented Apr 14, 2022

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@alliepiper alliepiper mentioned this pull request Apr 14, 2022
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@alliepiper alliepiper modified the milestones: 1.17.0, 2.0.0 Apr 25, 2022
@brycelelbach brycelelbach mentioned this pull request Nov 8, 2023
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alliepiper commented May 10, 2022

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Rebased. Now that the version has been bumped to 2.0.0 we can start to seriously think about merging this.

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gevtushenko
gevtushenko approved these changes May 11, 2022
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There are a few comments that I consider critical, but the source of the issue isn't caused by this PR. So the comments shouldn't block it. The rest of the comments are quite optional.

Comment thread testing/allocator.cu Resolved
Comment thread thrust/system/cuda/config.h Resolved
Comment thread thrust/system/cuda/detail/util.h Resolved
Comment thread thrust/system/cuda/detail/core/util.h Resolved
Comment thread thrust/system/cuda/detail/util.h Resolved
Comment thread thrust/system/cuda/detail/core/util.h Resolved
Comment thread thrust/system/cuda/detail/malloc_and_free.h
#include <thrust/system/detail/bad_alloc.h>
#include <thrust/detail/malloc_and_free.h>

#ifdef THRUST_CACHING_DEVICE_MALLOC

@gevtushenko gevtushenko May 11, 2022

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I don't see any documentation on this macro, is it still in use?

@alliepiper alliepiper May 16, 2022

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No idea.

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alliepiper commented May 16, 2022

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alliepiper added 8 commits May 16, 2022 18:05
@alliepiper
Bump CUB for NV_IF_TARGET refactor.
807e9e0
@alliepiper
Remove thrust_set_libcudacxx_target function from CMake user API.
539c9fa 
There's no way for a user to meaningfully use this, since libcudacxx
is a required dependency. It is checked during the initial
`find_package(Thrust)` call, before the user would have access to
Thrust's CMake API.

Updated the CMake README.md with instructions for using an explicit
libcudacxx target.
@alliepiper
Remove checks for obsolete architectures.
9e4f0a3
@alliepiper
Refactor to use NV_IF_TARGET.
3ea8940
@alliepiper
Remove unreachable code.
fdcd8e1
@alliepiper
Initialize members in cuda_optional detail class.
59a72c0
@alliepiper
Fix some new and exciting exec_space [subobject] warnings.
dd561bf
@alliepiper
Fix issues in testing/allocator.cu.
4cdf6de 
- The `g_state` flag wasn't reset between executions.
- The `destroy` method was being invoke in the current host system,
  not the system that owned the allocated memory (always cpp).
  This broke on MSVC's OpenMP implementation, where it seemed to be
  asserting the `g_state` flag before it was updated by `destroy`.
  This only happened on MSVC when host system = OMP, and appears to
  be a bug/miscompile in MSVC (repro'd on 2019). Fixed by explicitly
  tagging the allocator system to cpp.
- Added check that `destroy` is not invoked on empty vectors.
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alliepiper merged commit b223930 into NVIDIA:main May 17, 2022
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alliepiper deleted the if_target_prep branch May 17, 2022 17:48
@alliepiper alliepiper mentioned this pull request May 20, 2022
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@alliepiper alliepiper mentioned this pull request Mar 1, 2022
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@ericniebler ericniebler Awaiting requested review from ericniebler
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@robertmaynard robertmaynard robertmaynard approved these changes
@gevtushenko gevtushenko gevtushenko approved these changes
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helps: nvc++ Helps or needed by NVC++. P0: must have Absolutely necessary. Critical issue, major blocker, etc. release: breaking change Include in "Breaking Changes" section of release notes. type: enhancement New feature or request.

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