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fix: first hash of prefix cache with same model name #1341

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fix: first hash of prefix cache with same model name #1341

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8 changes: 6 additions & 2 deletions pkg/epp/scheduling/framework/plugins/multi/prefix/plugin.go
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Original file line number Diff line number Diff line change
Expand Up @@ -257,8 +257,12 @@ func hashPrompt(ctx context.Context, request *types.LLMRequest, cacheBlockSize i
// If the last block is smaller than cacheBlockSize, it will be ignored.
res := make([]BlockHash, 0, 1+len(prompt)/cacheBlockSize)
// Add the model to the first block hash so that different models have different hashes even with the same body.
res = append(res, BlockHash(xxhash.Sum64String(request.TargetModel)))
for i := 0; i+cacheBlockSize <= len(prompt); i += cacheBlockSize {
if len(prompt) >= cacheBlockSize {
firstBlock := prompt[0:cacheBlockSize]
combined := append([]byte(request.TargetModel), firstBlock...)
res = append(res, BlockHash(xxhash.Sum64(combined)))
}
for i := cacheBlockSize; i+cacheBlockSize <= len(prompt); i += cacheBlockSize {
block := prompt[i : i+cacheBlockSize]
prevBlockHash := res[len(res)-1]
block = append(block, toBytes(prevBlockHash)...)
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