CollectiveX: experimental cross-vendor collective/EP benchmark#1896

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Commits on Jun 23, 2026

Add CollectiveX experimental cross-vendor collective/EP benchmark
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CollectiveX: import container by multi-arch tag, fix CI import hang
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Merge branch 'main' into collectivex
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CollectiveX: copy staged results back to checkout for artifact upload
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CollectiveX: per-job summary table + address PR review findings
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CollectiveX: render results as a GitHub Actions job summary
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CollectiveX: add MI355X / MoRI EP path (dispatch+combine)
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CollectiveX: run MI355X MoRI on push; align launcher with serving script
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CollectiveX: size MoRI symmetric heap (first MI355X run hit the 2 GiB default)
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CollectiveX: set MoRI heap to 6G (16 GiB failed RDMA MR registration)
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CollectiveX: MoRI MI355X validated on hardware; fix heap/buffer/teardown
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CollectiveX: wire rccl-tests collective primitives for MI355X (CX_BENCH=nccl)
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CollectiveX: key dispatch concurrency by SKU so B200/MI355X runs don't cancel each other
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CollectiveX: render busbw & latency vs bytes/rank sweep tables in the job summary
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CollectiveX: GB200 8-GPU multi-node MNNVL path (CX_NODES), validated on-node
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CollectiveX: fix multi-node build cache (MPI=0 vs MPI=1) + gate all-zero busbw
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