Fix flakey heterogeneous tests #1712
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* However this is restricted to *one* device launch per suite to prevent deadlocks. * Tests are much slower, but extremely thorough. * Concurrent H/D coverage is particularly exemplified in latch.pass.cpp.
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miscco
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🟨 CI Results [ Failed: 1 | Passed: 301 | Total: 302 ]
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| # | Runner |
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| 232 | linux-amd64-cpu16 |
| 28 | linux-amd64-gpu-v100-latest-1 |
| 24 | linux-arm64-cpu16 |
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🟩 CI Results [ Failed: 0 | Passed: 302 | Total: 302 ]
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| # | Runner |
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| 232 | linux-amd64-cpu16 |
| 28 | linux-amd64-gpu-v100-latest-1 |
| 24 | linux-arm64-cpu16 |
| 18 | windows-amd64-cpu16 |
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| CCCL Infrastructure | |
| +/- | libcu++ |
| CUB | |
| Thrust |
Modifications in project or dependencies?
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| CCCL Infrastructure | |
| +/- | libcu++ |
| +/- | CUB |
| +/- | Thrust |
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Description
This change makes the heterogeneous tests run only one device kernel at a time. It will validate every step by permuting which part of the test is run on GPU.
For example a three step test that writes a value, waits on a value, and synchronously resets the value will rotate test responsibility like so:
DHH->HHD->HDHTest kernels are launched asynchronously from the main thread just like asynchronous host threads. However that isn't sufficient to guarantee that the process will be handed a channel for launching multiple kernels. Therefore our only option is to pick one job to launch on device at a time.
closes: #511 #603
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