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bugfix: clarify linear state cache allocation failure message. #1302

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Merged
liutongxuan merged 1 commit into from
Apr 20, 2026
Merged

bugfix: clarify linear state cache allocation failure message. #1302

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11 changes: 11 additions & 0 deletions xllm/core/distributed_runtime/llm_engine.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -544,6 +544,17 @@ Engine::KVCacheCapacity LLMEngine::estimate_kv_cache_capacity() {
const int64_t available_full_cache_size_in_bytes =
kv_cache_cap.cache_size_in_bytes -
kv_cache_cap.linear_cache_size_in_bytes;
if (kv_cache_cap.linear_slot_size > 0) {
CHECK_GT(kv_cache_cap.cache_size_in_bytes,
kv_cache_cap.linear_cache_size_in_bytes)
<< "failed to reserve linear state cache for linear-attention layers: "
<< "max_seqs_per_batch (" << FLAGS_max_seqs_per_batch
<< ") is too large. Please reduce max_seqs_per_batch to less than "
<< kv_cache_cap.cache_size_in_bytes /
(kv_cache_cap.num_linear_attention_layers *
kv_cache_cap.linear_slot_size) -
2;
}
CHECK_GT(available_full_cache_size_in_bytes, 0)
<< "no memory left for full-attention kv cache after reserving linear "
"state cache";
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