[Feature] Add a runtime flag to enable fail fast when attn window is too large to fit at least one sequence in KV cache

[moraxu]

Description

As per NIM request, add a runtime flag to enable fail fast when attn window is too large to fit at least one sequence in KV cache.

Test Coverage

For now, tested with:

trtllm-serve ${ENGINE_PATH} \
    --tokenizer ${CKPT_PATH} \
    --max_seq_len 100 \
    --kv_cache_free_gpu_memory_fraction 0.001 \
    --fail_fast_on_attention_window_too_large

and:

python3 examples/run.py \
--engine_dir ${ENGINE_PATH} \
--max_output_len 100 \
--tokenizer_dir ${CKPT_PATH} \
--input_text "$LONG_INPUT" \
--kv_cache_free_gpu_memory_fraction 0.001 \
--fail_fast_on_attention_window_too_large

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[moraxu]

/bot run

[tensorrt-cicd]

PR_Github #11351 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11351 [ run ] completed with state FAILURE
/LLM/release-0.21/L0_MergeRequest_PR pipeline #198 completed with status: 'FAILURE'

[moraxu]

/bot run

[tensorrt-cicd]

PR_Github #11355 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11355 [ run ] completed with state FAILURE
/LLM/release-0.21/L0_MergeRequest_PR pipeline #199 completed with status: 'FAILURE'

[moraxu]

/bot run

[tensorrt-cicd]

PR_Github #11382 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11382 [ run ] completed with state SUCCESS
/LLM/release-0.21/L0_MergeRequest_PR pipeline #203 completed with status: 'FAILURE'

[moraxu]

/bot run

[tensorrt-cicd]

PR_Github #11415 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11415 [ run ] completed with state FAILURE
/LLM/release-0.21/L0_MergeRequest_PR pipeline #206 completed with status: 'FAILURE'

[moraxu]

/bot run

[tensorrt-cicd]

PR_Github #11454 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11454 [ run ] completed with state FAILURE
/LLM/release-0.21/L0_MergeRequest_PR pipeline #211 completed with status: 'FAILURE'

[moraxu]

/bot run

[tensorrt-cicd]

PR_Github #11467 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11467 [ run ] completed with state ABORTED

[moraxu]

/bot run

[tensorrt-cicd]

PR_Github #11476 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11476 [ run ] completed with state SUCCESS
/LLM/release-0.21/L0_MergeRequest_PR pipeline #213 completed with status: 'SUCCESS'
Pipeline passed with automatic retried tests. Check the rerun report for details.

[MartinMarciniszyn]

@moraxu , we are not adding any new features to release/0.21. That branch has reached FC date three weeks ago. Please target main.

[moraxu]

Reopened in #5817 due to rebase issues