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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #3066 +/- ##
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Coverage 84.16% 84.17%
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Files 258 258
Lines 57290 57292 +2
Branches 4893 4893
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+ Hits 48220 48224 +4
+ Misses 8244 8242 -2
Partials 826 826
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mloubout
approved these changes
Oct 20, 2026
EdCaunt
approved these changes
Oct 20, 2026
With no visible-device environment variable, the generated code selects device rank % ngpus, but ArgumentsMap._physical_deviceid used the bare rank. With more ranks than GPUs (e.g., two decoupler workers on a 1-GPU node), the device memory query then fails (None) and nbytes_avail_mapper raises TypeError: unsupported operand type(s) for -=: 'NoneType' and 'Integer'.
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Without a visible-device mask, the generated code selects device
rank % ngpus, but the Python memory query used the bare rank. With more ranks than devices (e.g. two ranks on one GPU) it queried a nonexistent device andnbytes_avail_mapperraisedTypeError: unsupported operand type(s) for -=: 'NoneType' and 'int'. The query now uses the same mapping.Test: the default-case block of
TestDeviceID::test_visible_devices_mpiassertsrank % ngpusand that the device memory can be queried (no mocks). Verified on an H200 node: 2 ranks on 1 GPU pass; main fails.#3067 is stacked on this one.
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