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Fix bug discovered in Jaccard testing #3758

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ChuckHastings
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@ChuckHastings ChuckHastings commented Jul 28, 2023

A customer identified an issue trying to run Jaccard. In MG calls they were seeing failed memory allocation calls.

While computing get_two_hop_neighbors, vertices were being shuffled incorrectly in the C API, so we were getting vertices processed on the wrong GPU, resulting in out-of-bounds memory references.

Moved the shuffle before renumbering, which puts vertices to be on proper GPU

Closes #3746

@ChuckHastings ChuckHastings self-assigned this Jul 28, 2023
@ChuckHastings ChuckHastings added bug Something isn't working non-breaking Non-breaking change labels Jul 28, 2023
@ChuckHastings ChuckHastings added this to the 23.08 milestone Jul 28, 2023
@ChuckHastings ChuckHastings marked this pull request as ready for review July 28, 2023 20:46
@ChuckHastings ChuckHastings requested a review from a team as a code owner July 28, 2023 20:46
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/merge

@rapids-bot rapids-bot bot merged commit b6de267 into rapidsai:branch-23.08 Jul 31, 2023
@ChuckHastings ChuckHastings deleted the debug_get_two_hop_neighbors branch September 27, 2023 21:40
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MG get_two_hop_neighbors fails with OOM on certain start_vertices regardless of graph size
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