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[None][fix] kv_cache_manager_v2: count only newly-added scratch blocks in resize #14531

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Merged
lancelly merged 2 commits into from
May 26, 2026
Merged

[None][fix] kv_cache_manager_v2: count only newly-added scratch blocks in resize #14531

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c3ec577
[None][fix] kv_cache_manager_v2: count only newly-added scratch block…
lancelly May 25, 2026
2adfa0a
[None][refactor] kv_cache_manager_v2: clarify scratch slot accounting…
lancelly May 25, 2026
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10 changes: 8 additions & 2 deletions tensorrt_llm/runtime/kv_cache_manager_v2/_core/_kv_cache.py
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,7 @@
div_up,
expect_type,
filled_list,
intersect,
make_typed,
map_optional,
stream_wait_events,
Expand Down Expand Up @@ -706,8 +707,13 @@ def resize(self, capacity: int | None, history_length: int | None = None) -> boo
continue
stale_beg, stale_end = stale_ranges[lc]
if enable_scratch:
num_scratch_blocks = len(scratch_ranges[lc])
num_new_normal_blocks = (new_num_blocks - old_num_blocks) - num_scratch_blocks
# Only newly added blocks consume slots below; scratch range may
# extend before old_num_blocks when history_length < old_capacity.
new_block_range = HalfOpenRange(old_num_blocks, new_num_blocks)
num_new_blocks_using_scratch = len(
intersect(scratch_ranges[lc], new_block_range)
)
num_new_normal_blocks = len(new_block_range) - num_new_blocks_using_scratch
num_new_slots[lc] = num_new_normal_blocks * beam_width
else:
if old_num_blocks < stale_beg:
Expand Down
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