[GH-ISSUE #676] [question]: what are the differences between using the Transfer Engine in Mooncake and using UCX for communication? #214

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opened 2026-10-29 21:11:00 +00:00 by bsakaguchi · 3 comments

bsakaguchi commented

2026-10-29 21:11:00 +00:00

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Originally created by @njw1123 on GitHub (Jul 26, 2025).
Original GitHub issue: https://github.com/kvcache-ai/Mooncake/issues/676

As a programmer who is not very familiar with communication, I would like to ask: what are the differences between using the Transfer Engine in Mooncake and using UCX for communication? They both seem to perform topology awareness and zero-copy (if supported by the hardware).

Originally created by @njw1123 on GitHub (Jul 26, 2025). Original GitHub issue: https://github.com/kvcache-ai/Mooncake/issues/676 As a programmer who is not very familiar with communication, I would like to ask: what are the differences between using the Transfer Engine in Mooncake and using UCX for communication? They both seem to perform topology awareness and zero-copy (if supported by the hardware).

bsakaguchi closed this issue

2026-10-29 21:11:00 +00:00

bsakaguchi commented

2026-10-29 21:11:01 +00:00

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@njw1123 commented on GitHub (Jul 26, 2025):

Also, in the nixl repository, UCX can be replaced by the Transfer Engine, as they provide similar functionality.

@njw1123 commented on GitHub (Jul 26, 2025): Also, in the nixl repository, UCX can be replaced by the Transfer Engine, as they provide similar functionality.

bsakaguchi commented

2026-10-29 21:11:01 +00:00

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@alogfans commented on GitHub (Jul 29, 2025):

Mooncake Transfer Engine is optimized for AI workloads, and our internal experiment shows that it outperforms UCX for small-sized I/Os.

@alogfans commented on GitHub (Jul 29, 2025): Mooncake Transfer Engine is optimized for AI workloads, and our internal experiment shows that it outperforms UCX for small-sized I/Os.

bsakaguchi commented

2026-10-29 21:11:01 +00:00

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@njw1123 commented on GitHub (Jul 29, 2025):

Mooncake Transfer Engine is optimized for AI workloads, and our internal experiment shows that it outperforms UCX for small-sized I/Os.

thanks for your reply.

@njw1123 commented on GitHub (Jul 29, 2025): > Mooncake Transfer Engine is optimized for AI workloads, and our internal experiment shows that it outperforms UCX for small-sized I/Os. thanks for your reply.

bsakaguchi referenced this issue

2026-10-29 21:27:06 +00:00

[PR #214] [MERGED] feat(ci): enhance build process with new import structure test #1399