[dlamd1dai]

Motivation

develop no longer builds the RCCL host microtests. #14529 and #13098 each added rcclCeAllReduceEnabled and rcclForceCeAllReduceEnabled to test/host/fakes/rccl_wrap_fakes.cc. Both merged on 2026-10-29, so the Host unit tests (CPU-only) job now fails for every RCCL PR built against develop:

rccl_wrap_fakes.cc:438:6: error: redefinition of 'rcclCeAllReduceEnabled'
rccl_wrap_fakes.cc:441:6: error: redefinition of 'rcclForceCeAllReduceEnabled'

Technical Details

Keep the #13098 definitions. Its rcclCeAllReduceEnabled honors g_rcclParamCeAllReduce, which ce-coll-test.cc sets. Remove the fail-loud copies from #14529. rcclForceCeScratchEnabled, which #14529 added next to them, is unchanged.

Issue Tracking

N/A (develop build break)

Test Plan

In the CI image (rocm/dev-ubuntu-22.04:7.2), run run_host_tests.sh phases deps, rccl-configure, hipify and configure. Then build rccl-UnitTestsMicroCollectives (the target that failed in CI), rccl-UnitTestsMicroCe and rccl-UnitTestsMicro, and run the first two.

Test Result

build                           OK
rccl-UnitTestsMicroCe           [  PASSED  ] 70 tests
rccl-UnitTestsMicroCollectives  [  PASSED  ] 103 tests

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/rocm-systems/blob/develop/CONTRIBUTING.md.

[therock-pr-bot]

✅ All Policy Checks Passed

Check	Status	Details
📝 PR Description	✅ Pass	—
⛔ Forbidden Files	✅ Pass	—
🧪 Unit Test	⚠️ Warning	Error: Source/code files changed without an accompanying unit test. Expected: add at least one test file named like test_<name>.py / test_<name>.cpp (or <name>_test.*). Current: code file(s) changed: projects/rccl/test/host/fakes/rccl_wrap_fakes.cc; no test file found
🚫 Draft PR	🔜 To Be Enabled	—
🚩 Feature Flag	🔜 To Be Enabled	—
📊 Code Coverage	🔜 To Be Enabled	—

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[amd-argus]

ARGUS

Findings

1 more finding(s), not posted inline

• projects/rccl/test/host/fakes/rccl_wrap_fakes.cc:418 (Low) The kept rcclCeAllReduceEnabled fake falls back to true, but production falls back to false on every arch except gfx1250 (rccl_wrap.cc:1073). A follow-up could make the fake default to false. As a follow-up, could the kept rcclCeAllReduceEnabled fake fall back to false at line 418? That would match rcclCeCollArchDefault in rccl_wrap.cc:1073-1076, which enables CE AllReduce only on gfx1250. ce-coll-test.cc sets g_rcclParamCeAllReduce, but that value is read through rcclParamCeAllReduce() (ce_coll.cc:3261) and not through this fake, so no current test depends on its default.

Bottom line: LGTM.

_{Comment @argus review to re-run, or @argus re-review after pushing.}

[dlamd1dai]

Closing as a duplicate: #14633 removed the same duplicate CE AllReduce fakes from rccl_wrap_fakes.cc and has merged to develop.