[OLD] [KV Offload] Fix MLA native KV offload GLM-5.2 - #4
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Signed-off-by: Procr <193802945+procr1337@users.noreply.github.com>
build_offloading_config() multiplied every group's block size by the context-parallel factor unconditionally. That was correct when all KV cache groups were CP-sharded, but dcp_replicated groups keep the full cache on every rank, so one of their blocks covers exactly block_size global tokens -- which is why SingleTypeKVCacheManager.__init__ excludes them from the same scaling. The connector therefore saw G * cp where the manager uses G. Since num_gpu_blocks, tokens_per_chunk and hashes_per_chunk all derive from tokens_per_block, the affected group's block and chunk counts came out a factor of cp too small and its offload keys landed on the wrong token boundaries, silently corrupting that group's KV on a load hit. Mirror the manager's rule so both agree on the effective block size. Affects any cp > 1 run combining the offloading connector with a replicated group: DFlash draft groups, the DeepSeek V3.2 sparse indexer, and the DeepSeek V4 compressor. Signed-off-by: Procr <193802945+procr1337@users.noreply.github.com>
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NOTE: This is inefficient, it doesn't deduplicate. Seems like it creates 4x overhead, instead of 2x which LMCache does on DCP=4. Probably vllm-project#47929 will ultimately fix this
Merged in v20 r5 or r6
PR created and merged against FujitsuPolycom#10