Fix intercommunicator overflow with big payload collectives #9942
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bosilca
reviewed
Jan 28, 2022
* The 'inter' collective component was multiplying the `int` count by
the `int` size of the communicator which can overflow the integer.
- Solution is to preserve the full `size_t` value in the compuation
which the PML supports.
* `allgather`, `gather`, `scatter` all overflowed in a multiply
- Preserve the full `size_t` value in the multiply
- allgather needed extra code to handle the bcast of the result
* `allgatherv`, `gatherv`, `scatterv` all overflowed a `total` variable
that accumulated over the count array.
- Preserve the full `size_t` value in `total` type
Signed-off-by: Joshua Hursey <jhursey@us.ibm.com>
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@bosilca when you have a chance can you re-review? |
bosilca
approved these changes
Feb 4, 2022
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intcount bythe
intsize of the communicator which can overflow the integer.size_tvalue in the compuationwhich the PML supports.
allgather,gather,scatterall overflowed in a multiplysize_tvalue in the multiplyallgatherv,gatherv,scattervall overflowed atotalvariablethat accumulated over the count array.
size_tvalue intotaltype